ESP8266 and ATmega8 UART - esp8266

I connect ESP8266 with ATmega8 using UART. I send some value from ESP8266 to ATmega8 on that basis of the value ATmega8 send back some value to the ESP8266 and this is working fine but after few hours ATmega8 does to send data after resetting ATmega8 its working fine but then again a few hours later its stop send data.
//ESP8266 CODE
Serial.write(post_data);
delay(2000);
String port_status = "";
if (Serial.available()) {
incomingByte = Serial.read();
delay(2000);
if(incomingByte == 70) {
pin_status = '0';
}
if(incomingByte == 79) {
pin_status = '1';
}
}
//ATMEGA8 CODE
int main() {
unsigned char reccive;
unsigned char ch;
while(1) {
while(! (UCSRA & (1<<RXC)));
{
reccive = UDR;
ch = ' ';
if(reccive == 'A') {
reccive = ' ';
_delay_ms(500);
ch = 'O';
while(! (UCSRA & (1<<TXC)));
{
UDR = 'O';
_delay_ms(500);
}
}
else {
ch = 'F';
while(! (UCSRA & (1<<TXC)));
{
UDR = 'F';
_delay_ms(500);
}
}
}
}
}

Could be your Serial Buffer is just full. Either implement a Serial Flush function or a watchdog function that softresets (very dirty way) the Arduino. If you can log this somewhere, try to see if it always stops after a certain time, or if it is random. That way you, it might create more insight in the problem.

Related

Blue ESP8266-12e tx light staying on

I have some code I have been putting on an ESP8266-12e board. Until recently it always worked fine. Now though when I finish uploading the code the blue light on the ESP8266-12e is staying on. I have tried it on two different board and the blue light stay on on both. I can't figure out what I changed in the code.
I have decided to put it up and have everyone look at it and let me know what I may be missing.
I hope someone can find something.
My code:
//NodeMCU 1.0 (ESP-12E Module constant connect)
#include <ESP8266WiFi.h>
#include <FS.h> //https://github.com/esp8266/Arduino
#include <EEPROM.h>
//needed for library
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h> //https://github.com/tzapu/WiFiManager
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
//MQTT stuff
#define AIO_SERVER "go,here"
#define AIO_SERVERPORT SSSS // 8883 for MQTTS
#define AIO_USERNAME "FFFFFF"
#define AIO_KEY "XXXXXXXXXXXXXXXXXXXXXXX"
int tripper = 1;
#define MQTT_CONN_KEEPALIVE 18000000
#define LED3 16
//NEW AUTOCONNECT
const byte numChars = 32;
char receivedChars[numChars];
char Password[36]="";
char apiKey[16]="";
char apiKey2[32]="";
char channelKey[16];
char channelKey2[16];
String channelKey21= "&";
byte pinState = LOW;
char ssid[] = "";
char pass[] = "";
String Label = "";
String TOTAL = "";
uint32_t m=0;
WiFiClient client;
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
// Setup a feed called 'onoff' for subscribing to changes.
Adafruit_MQTT_Subscribe trip2 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/trip");
Adafruit_MQTT_Publish move1 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/motion");
/*************************** Error Reporting *********************************/
Adafruit_MQTT_Subscribe errors = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/errors");
Adafruit_MQTT_Subscribe throttle = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/throttle");
//NEW AUTOCONNECT
int LED2 = 13;
int MOVEMENT = 5;
//send ssid/pass
String f;
//mqtt
char temperature[]="000";
String level;
String battery;
String trip;
String date;
int addr = 0;
//END NEW AUTOCONNECT
void MQTT_connect();
void setup() {
Serial.begin(115200);
pinMode(MOVEMENT,OUTPUT);
digitalWrite(MOVEMENT,LOW);
pinMode(D5,OUTPUT);
digitalWrite(D5,LOW);
pinMode(LED3,OUTPUT);
digitalWrite(LED3,LOW);
pinMode(LED2,INPUT);
Serial.println(F("Adafruit MQTT demo"));
//NEW AUTOCONNECT
WiFiManager wifiManager;
// put your setup code here, to run once:
WiFiManagerParameter customAPIKey("apiKey", "Time Zone #", apiKey, 16);
wifiManager.addParameter(&customAPIKey);
wifiManager.autoConnect("FloWT2");
Serial.println("Connected");
strcpy(apiKey,customAPIKey.getValue());
EEPROM.begin(512); //Initialize EEPROM
EEPROM.write(addr, 'A'); //Write character A
addr++; //Increment address
EEPROM.write(addr, 'B'); //Write character A
String www = apiKey;
Serial.print("www");
Serial.print (www);
for(int i=0;i<www.length();i++) //loop upto string lenght www.length() returns length of string
{
EEPROM.write(0x0F+i,www[i]); //Write one by one with starting address of 0x0F
}
EEPROM.commit();
delay (2000);
if (WiFi.status() == WL_DISCONNECTED) {
wifiManager.autoConnect("FloWT2");
delay(60000);}
if (WiFi.status() == WL_CONNECTED) { Serial.println("Connected");
delay(1000);
//get time zone
EEPROM.begin(512);
Serial.println(""); //Goto next line, as ESP sends some garbage when you reset it
Serial.print(char(EEPROM.read(addr))); //Read from address 0x00
addr++; //Increment address
Serial.print(char(EEPROM.read(addr))); //Read from address 0x01
addr++; //Increment address
Serial.println(char(EEPROM.read(addr))); //Read from address 0x02
//Read string from eeprom
String www;
//Here we dont know how many bytes to read it is better practice to use some terminating character
//Lets do it manually www.circuits4you.com total length is 20 characters
for(int i=0;i<16;i++)
{
www = www + char(EEPROM.read(0x0F+i)); //Read one by one with starting address of 0x0F
}
Serial.println("this");
Serial.print(www);
Serial.println("IP address: "); Serial.println(WiFi.localIP());
// Setup MQTT subscription for onoff feed
mqtt.subscribe(&trip2);
// Setup MQTT subscriptions for throttle & error messages
mqtt.subscribe(&throttle);
mqtt.subscribe(&errors);
WiFiClient client;
delay(2000);
Serial.printf("SSID: %s\n", WiFi.SSID().c_str());
Serial.printf("SSID: %s\n", WiFi.psk().c_str());
String ssidString = WiFi.SSID().c_str();
String pskString = WiFi.psk().c_str();
f = String('<')+String("Hi")+String(',')+String(ssidString)+String(',')+String(pskString)+String(',')+String(www)+String('>');
delay (1000);
Serial.print(f);
delay(500);
Serial.print(f);
delay(500);
Serial.print(f);
delay(500);
Serial.print(f);
delay(500);
Serial.print(f);
delay(500);
}
client.stop();
}
void loop() {
MQTT_connect();
uint32_t m=0;
Serial.print(F("\nSending motion val "));
Serial.print(m);
Serial.print("...");
if (! move1.publish(m)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
long state = digitalRead(LED2);
if(state == HIGH) {
m = 1;
Serial.print(F("\nSending motion val "));
Serial.print(m);
Serial.print("...");
digitalWrite(MOVEMENT,HIGH);
delay(1000);
digitalWrite(MOVEMENT,LOW);
if (! move1.publish(m)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
}
else{
}
// this is our 'wait for incoming subscription packets' busy subloop
// try to spend your time here
//12e
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(5000))) {
if (subscription == &trip2) {
Serial.print(F("Got onoff: "));
Serial.println((char *)trip2.lastread);
uint16_t sliderval = atoi((char *)trip2.lastread);
//THIS IS FOR LATCHING RELAY TURN ON D5 HIGH THEN OFF AFTER 1 SECOND
//NEXt TURN D6 HIGH THEN OFF AFTER A SECONDS
if((sliderval ==0)&&(tripper == 1)){
digitalWrite(D5,HIGH);
delay(1000);
digitalWrite(D5,LOW);
tripper = 2;
Serial.print(tripper);
Serial.print("tripped");
}
else if(sliderval == 50){
}
else if((sliderval == 100)&&(tripper == 2)){
digitalWrite(LED3,HIGH);
delay(1000);
digitalWrite(LED3,LOW);
tripper = 1;
Serial.print(tripper);
Serial.print("tripped2");
}
} else if(subscription == &errors) {
Serial.print(F("ERROR: "));
Serial.println((char *)errors.lastread);
} else if(subscription == &throttle) {
Serial.println((char *)throttle.lastread);
}
}
}
void MQTT_connect() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 5 seconds...");
mqtt.disconnect();
delay(5000); // wait 5 seconds
retries--;
if (retries == 0) {
// basically die and wait for WDT to reset me
while (1);
}
}
Serial.println("MQTT Connected!");
}
I hope it is not toooo long.
Anyway I hope someone can find my problem. Everything works ok with the blue light on it is just know supposed to be that I can tell.
When I upload another code it doesn't stay on so it has to be in the code.
I will keep looking.
THANKS
So I got the blue light to go off. Instead of pinMode(D4,INPUT); and digitalWrite(D4,LOW); D4 is pin 16 which is the wake pin. So I had to define it thus #define LED3 16 and then pinMode(LED3,INPUT); and digitalWrite(LED3,LOW); I will change my original code to reflect these changes.

ESP8266 WeMos D1 using deepsleep drains too much battery

I've developed a fingerprint sensor using NodeMCU D1 mini powered by a 1000mah battery.
Everything seems working correctly except for battery energy consumption.
I have read several topic where user says that using deepsleep fuction on NodeMCU 1000mah battery should last more than 3 month but mine doesn't reach 2 days.
This is my circuit schematic
I also report here my code snipped that I'm currently using. The circuit should wake up from deepsleep when the button is pressed and start reading the fingerprint sensor. If it detect a valid fingerprint, a message is sent to MQTT broker.
#include <Adafruit_Fingerprint.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* _ssid = "ZZZXXXYYY";
const char* _password = "pass";
const char* mqttServer = "IPADDRESS";
const int mqttPort = 1883;
const char* mqttUser = "USER";
const char* mqttPassword = "PASS";
long initialMillis = 0;
unsigned int raw=0;
// On Leonardo/Micro or others with hardware serial, use those! #0 is green wire, #1 is white
// uncomment this line:
//#define mySerial Serial
// For UNO and others without hardware serial, we must use software serial...
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino (WHITE wire)
// comment these two lines if using hardware serial
SoftwareSerial mySerial(4, 5);
WiFiClient espClient;
PubSubClient client(espClient);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
void setup()
{
Serial.begin(9600);
pinMode(A0, INPUT);
// Connect to Fingerprint. Set the data rate for the sensor serial port
finger.begin(57600);
delay(5);
if (finger.verifyPassword()) {
Serial.println("Found fingerprint sensor!");
} else {
Serial.println("Did not find fingerprint sensor :(");
ESP.deepSleep(10 * 1000000);
}
finger.getTemplateCount();
// Connect to WIFI
WiFi.mode(WIFI_STA);
WiFi.begin(_ssid, _password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Connect to MQTT
client.setServer(mqttServer, mqttPort);
while (!client.connected()) {
Serial.println("Connecting to MQTT...");
if (client.connect("ESPFingerprint", mqttUser, mqttPassword )) {
Serial.println("Connected to MQTT server");
} else {
Serial.print("failed with state ");
Serial.print(client.state());
delay(2000);
}
}
// Calculate battery percentage
raw = analogRead(A0);
String bLevel = "{\"Battery\":" + String(raw) + "}";
Serial.print("Battery: ");
Serial.print(raw);
Serial.print(" -> ");
Serial.println(bLevel);
initialMillis = millis();
client.publish("tele/fingerprint/LWT", "Online");
client.publish("tele/fingerprint/STATE", (char*)bLevel.c_str(), true);
Serial.print("MQTT subscribed: ");
Serial.println(WiFi.localIP());
}
void loop()
{
unsigned long currentMillis = millis();
int fid = getFingerprintIDez();
if(fid != -1) {
String fpIdstr = String(fid);
client.publish("cmnd/fingerprint/RESULT", (char*)fpIdstr.c_str());
Serial.println("Fingerprint correct. Going to sleep.");
client.publish("tele/fingerprint/LWT", "Offline");
// trigger disconnection from MQTT broker to correctly send the message before going to sleep
client.disconnect();
espClient.flush();
// wait until connection is closed completely
while(client.state() != -1){
delay(10);
}
ESP.deepSleep(0);
}
else if(currentMillis - initialMillis >= 15000){
Serial.println("Timeout expired. Going to sleep.");
client.publish("tele/fingerprint/LWT", "Offline");
ESP.deepSleep(0);
}
delay(50); //don't ned to run this at full speed.
}
uint8_t getFingerprintID() {
uint8_t p = finger.getImage();
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image taken");
break;
case FINGERPRINT_NOFINGER:
Serial.println("No finger detected");
return p;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
return p;
case FINGERPRINT_IMAGEFAIL:
Serial.println("Imaging error");
return p;
default:
Serial.println("Unknown error");
return p;
}
// OK success!
p = finger.image2Tz();
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image converted");
break;
case FINGERPRINT_IMAGEMESS:
Serial.println("Image too messy");
return p;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
return p;
case FINGERPRINT_FEATUREFAIL:
Serial.println("Could not find fingerprint features");
return p;
case FINGERPRINT_INVALIDIMAGE:
Serial.println("Could not find fingerprint features");
return p;
default:
Serial.println("Unknown error");
return p;
}
// OK converted!
p = finger.fingerFastSearch();
if (p == FINGERPRINT_OK) {
Serial.println("Found a print match!");
} else if (p == FINGERPRINT_PACKETRECIEVEERR) {
Serial.println("Communication error");
return p;
} else if (p == FINGERPRINT_NOTFOUND) {
Serial.println("Did not find a match");
return p;
} else {
Serial.println("Unknown error");
return p;
}
// found a match!
Serial.print("Found ID #"); Serial.print(finger.fingerID);
Serial.print(" with confidence of "); Serial.println(finger.confidence);
return finger.fingerID;
}
// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
uint8_t p = finger.getImage();
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz();
if (p != FINGERPRINT_OK) return -1;
p = finger.fingerFastSearch();
if (p != FINGERPRINT_OK) return -1;
// found a match!
Serial.print("Found ID #"); Serial.print(finger.fingerID);
Serial.print(" with confidence of "); Serial.println(finger.confidence);
return finger.fingerID;
}
Can somebody let me know if there is something wrong in my code or circuit?

How to convert an image file to base64 string using Arduino UNO or using any other Microcontroller?

Suppose I am in a room which is totally locked and I am begging for the key, so I can go outside. But the person who locked the door behind me is asking to solve a problem for him. The problem is that I have an SD card, SD card module, Arduino UNO, power, a laptop with internet access. What I need to do for the person is that I have to convert an image file stored in the SD card to a base64 string using the Arduino. Now I want to know how to this task for the person, so I can go out freely. Kindly remember the title of this question, otherwise, my life is in danger, and please avoid suggestions only. If you have done this before, then you might answer the question, otherwise please do not. Sorry for being harsh, but it is really bad to have a bad answer. StackOverflow is my last hope.
I have used a library called base64 for Arduino, but I didn't solve my problem. Here is the library. https://github.com/adamvr/arduino-base64
My aim was to convert image to the Base64 string format and then send this string through ESP8266 module to the webserver.
Until now, I didn't find any solution to this problem. I found an alternative to send images taken by a camera. That alternative is a camera module with ESP32-S. This module is "ESP32-S Cam", which takes pictures and sends them to an online webserver.
Here is the code for ESP32 Cam for taking and sending picture to the server where we will have a PHP Scrip given under this code.
#include "esp_http_client.h"
#include "esp_camera.h"
#include <WiFi.h>
#include "Arduino.h"
const char* ssid = "ashiq"; // my wifi "SSID" name
const char* password = "11585858"; // my wifi Password
int capture_interval = 20000; // Microseconds between captures
const char *post_url = "http://app.softwarism.com/esp32/getPhoto.php"; // Location where images are POSTED
bool internet_connected = false;
long current_millis;
long last_capture_millis = 0;
//for indicating that the picture has been taken and then sent
#define GPIO_PIN_WAKEUP GPIO_NUM_12
// CAMERA_MODEL_AI_THINKER
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SIOD_GPIO_NUM 26
#define SIOC_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22
void setup()
{
Serial.begin(115200);
//Setup indication pin Mode
pinMode(GPIO_PIN_WAKEUP,OUTPUT);
if (init_wifi()) { // Connected to WiFi
internet_connected = true;
Serial.println("Internet connected");
}
camera_config_t config;
config.ledc_channel = LEDC_CHANNEL_0;
config.ledc_timer = LEDC_TIMER_0;
config.pin_d0 = Y2_GPIO_NUM;
config.pin_d1 = Y3_GPIO_NUM;
config.pin_d2 = Y4_GPIO_NUM;
config.pin_d3 = Y5_GPIO_NUM;
config.pin_d4 = Y6_GPIO_NUM;
config.pin_d5 = Y7_GPIO_NUM;
config.pin_d6 = Y8_GPIO_NUM;
config.pin_d7 = Y9_GPIO_NUM;
config.pin_xclk = XCLK_GPIO_NUM;
config.pin_pclk = PCLK_GPIO_NUM;
config.pin_vsync = VSYNC_GPIO_NUM;
config.pin_href = HREF_GPIO_NUM;
config.pin_sscb_sda = SIOD_GPIO_NUM;
config.pin_sscb_scl = SIOC_GPIO_NUM;
config.pin_pwdn = PWDN_GPIO_NUM;
config.pin_reset = RESET_GPIO_NUM;
config.xclk_freq_hz = 20000000;
config.pixel_format = PIXFORMAT_JPEG;
//init with high specs to pre-allocate larger buffers
if (psramFound()) {
config.frame_size = FRAMESIZE_UXGA;
config.jpeg_quality = 10;
config.fb_count = 2;
} else {
config.frame_size = FRAMESIZE_SVGA;
config.jpeg_quality = 12;
config.fb_count = 1;
}
// camera init
esp_err_t err = esp_camera_init(&config);
if (err != ESP_OK) {
Serial.printf("Camera init failed with error 0x%x", err);
return;
}
}
bool init_wifi()
{
int connAttempts = 0;
Serial.println("\r\nConnecting to: " + String(ssid));
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED ) {
delay(500);
Serial.print(".");
if (connAttempts > 10) return false;
connAttempts++;
}
return true;
}
esp_err_t _http_event_handler(esp_http_client_event_t *evt)
{
switch (evt->event_id) {
case HTTP_EVENT_ERROR:
Serial.println("HTTP_EVENT_ERROR");
break;
case HTTP_EVENT_ON_CONNECTED:
Serial.println("HTTP_EVENT_ON_CONNECTED");
break;
case HTTP_EVENT_HEADER_SENT:
Serial.println("HTTP_EVENT_HEADER_SENT");
break;
case HTTP_EVENT_ON_HEADER:
Serial.println();
Serial.printf("HTTP_EVENT_ON_HEADER, key=%s, value=%s", evt->header_key, evt->header_value);
break;
case HTTP_EVENT_ON_DATA:
Serial.println();
Serial.printf("HTTP_EVENT_ON_DATA, len=%d", evt->data_len);
if (!esp_http_client_is_chunked_response(evt->client)) {
// Write out data
// printf("%.*s", evt->data_len, (char*)evt->data);
}
break;
case HTTP_EVENT_ON_FINISH:
Serial.println("");
Serial.println("HTTP_EVENT_ON_FINISH");
break;
case HTTP_EVENT_DISCONNECTED:
Serial.println("HTTP_EVENT_DISCONNECTED");
break;
}
return ESP_OK;
}
static esp_err_t take_send_photo()
{
Serial.println("Taking picture...");
camera_fb_t * fb = NULL;
esp_err_t res = ESP_OK;
fb = esp_camera_fb_get();
if (!fb) {
Serial.println("Camera capture failed");
return ESP_FAIL;
}else{
indication();
}
esp_http_client_handle_t http_client;
esp_http_client_config_t config_client = {0};
config_client.url = post_url;
config_client.event_handler = _http_event_handler;
config_client.method = HTTP_METHOD_POST;
http_client = esp_http_client_init(&config_client);
esp_http_client_set_post_field(http_client, (const char *)fb->buf, fb->len);
esp_http_client_set_header(http_client, "Content-Type", "image/jpg");
esp_err_t err = esp_http_client_perform(http_client);
if (err == ESP_OK) {
Serial.print("esp_http_client_get_status_code: ");
Serial.println(esp_http_client_get_status_code(http_client));
}
esp_http_client_cleanup(http_client);
esp_camera_fb_return(fb);
}
void loop()
{
// TODO check Wifi and reconnect if needed
current_millis = millis();
if (current_millis - last_capture_millis > capture_interval) { // Take another picture
last_capture_millis = millis();
take_send_photo();
//indicate that the picture has been taken and sent
indication();
}
}
void indication(){
digitalWrite(GPIO_PIN_WAKEUP,HIGH);
delay(1000);
digitalWrite(GPIO_PIN_WAKEUP,LOW);
}
Here is the PHP Script waiting to get the picture sent by the camera.
<?php
require_once("con.php");
$received = file_get_contents('php://input');
$fileToWrite = "uploads/smart_tick_".time().".jpg";
if(file_put_contents($fileToWrite, $received)){
echo "Uploaded";
}
?>
Note: Do not forget to create a folder "uploads" in the same directory where the PHP Script is.

Arduino's serial communication with gsm board

I am trying to write a program where arduino receives text from the gsm module.But my program is able to read the first text and perform a duty,but i want it to receive multiple texts and perform individual tasks for each respective texts?Any help will be great.Thank You.
#include <SoftwareSerial.h>
SoftwareSerial gsm(2, 3);
String inString[64]; // string to hold input coming from device
String read;
int count = 0;
boolean verifyingDone = false; // flags to determine the action completed and to perform next action
boolean regist = false;
boolean registercomplete = false;
boolean location = false;
void setup()
{
// put your setup code here, to run once:
Serial.begin(9600);
gsm.begin(4800);
delay(100);
gsm.print("ate0\r"); // removes the echo from the device
delay(100);
gsm.print("at+cnmi=1,2,0,0,0\r"); // to receive a text
Serial.print("The Device has been Intiated");
}
void loop() {
if (gsm.available())
{
while (gsm.available())
{
read = gsm.readString();
verifyNum(); // verifying the number
/* verifyingDone=true;
if(verifyingDone){
delay(1000);
gsm.print("at+cgpsinfo\r");
delay(1000);
checkGps();
verifyingDone=false;
*/
reading1: inString[count++] = read;
Serial.print(String(read));
if (count == 64) {
break;
}
}
delay(200);
count = 0;
}
}
void clearBufferArray()
{
for (int i = 0; i < count; i++)
{
inString[i] = "";
}
}
void verifyNum() {
if (read.startsWith("\r\n+CMT: ")) { // checking the incoming text and verifying the pre-defined number
int index1 = read.indexOf('"');
int index2 = read.indexOf('"', index1 + 1);
String Number = read.substring(index1 + 2, index2);
char floatbuf[100]; // make this at least big enough for the whole string
Number.toCharArray(floatbuf, 100);
int number = atoi(floatbuf);
//Serial.println(number);
delay(1000);
if (strcmp(number, 24190) == 0)
{
Serial.println("The Sending number is " + Number);
Serial.println("This is the registered number");
regist = true;
if (regist) {
gsm.print("AT+CMGS=\"0434519166\"\r"); // Sending registeration confirmation via sms
delay(100);
gsm.print("Success this mobile number has been registered .\r");
gsm.print("\r");
delay(100);
gsm.println((char)26);
delay(10000);
registercomplete = true;
if (regist == true && registercomplete == true) { //after complete registeration ,checking the gps and sending the co-ordinates
checkGps();
delay(500);
}
}
else {
gsm.print("AT+CMGSO=\"0434519166\" \,\"Someone tried to access your device\"\r"); // When not a registered number
}
}
}
}
void checkGps()
{
Serial.print("Gps Search has started");
delay(10000);//big delay to complete previous process //Not able to do this process completely------>Coz not able to re-read the string obtained from the first read..have to find an alternate to read incoming signals efficiently and re-using it
clearBufferArray();
delay(1000);
gsm.write("at+cgpsinfo\r");
delay(10000);
Serial.println();
Serial.println();
Serial.print("Locating.....Wait for a moment");
/*int spacePosition = read.indexOf(':');
if (read.charAt(spacePosition + 1) == ',' && regist==true )*/
if (read.startsWith("\r\n+CGPINFO:,,,"))
{
Serial.println("GPS signal not found.Go outside"); //
gsm.print("AT+CMGS=\"0434519166\"\r"); // Sending location as sms
delay(100);
gsm.print("GPS signal not found.Go outside ");
gsm.print("\r");
delay(100);
gsm.println((char)26);
delay(1000);
regist = false;
}
else
{
Serial.println("Signal found");
gsm.print("AT+CMGS=\"0434519166\"\r"); //Confirming signal found and sending location----->location finding programs can be obtained from previouses sketches
delay(100);
gsm.print("GPS found.Location will be sent soon ");
gsm.print("\r");
delay(100);
gsm.println((char)26);
delay(1000);
}
}
Thank You,Above code is justa tryout ,any help is welcome!

Android to Arduino Uno + Wi-Fi shield string communication

I am trying to make a wireless light control device (on/off/dimming) using an Arduino, an Android app, and a router.
I am setting the Arduino to a static IP 192.168.1.2 using the router. I am sending strings ("1"-off, "2"-decrease brightness, "3"-increase brightness, "4"-on) from the Android app to the IP address 192.168.1.2. I have connected the Arduino to the Internet using the Arduino Wi-Fi shield and set up the WifiServer using the following code:
char ssid[] = "NAME"; // Your network SSID (name)
char pass[] = "PASS"; // Your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // Your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(23);
boolean alreadyConnected = false; // Whether or not the client was connected previously.
void setup() {
// Start serial port:
Serial.begin(9600);
// Attempt to connect to Wi-Fi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
// Wait 10 seconds for connection:
delay(10000);
}
// Start the server:
server.begin();
// You're connected now, so print out the status:
printWifiStatus();
}
The main problem I am having is how to accept and print out the strings from the Android device. The current code I have to do this is:
// Listen for incoming clients
WiFiClient client = server.available();
if (client) {
// An HTTP request ends with a blank line
boolean newLine = true;
String line = "";
while (client.connected() && client.available()) {
char c = client.read();
Serial.print(c);
// If you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply.
if (c == '\n' && newLine) {
// Send a standard HTTP response header
//client.println("HTTP/1.1 200 OK");
//client.println("Content-Type: text/html");
//client.println();
}
if (c == '\n') {
// You're starting a new line
newLine = true;
Serial.println(line);
line = "";
}
else if (c != '\r') {
// You've gotten a character on the current line
newLine = false;
line += c;
}
}
Serial.println(line);
// Give the web browser time to receive the data
delay(1);
// Close the connection:
//client.stop();
}
}
I am basing this code off of the blog post Android Arduino Switch with a TinyWebDB hack, but this code is for an Ethernet shield. The Android app was made using the MIT App Inventor, which is similar to the one found the blog post.
TLDR, how can I get the strings using the Arduino Wi-Fi shield?
You can read the characters into a full string instead of reading each individual character into the serial monitor as in your example above.
In your example, this bit of code would read each character from the client TCP session and print it to the serial monitor, thus displaying the HTTP requests in the serial console.
char c = client.read();
Serial.print(c);
Try something like this instead. Declare a string named "readString" before your setup() function in the Arduino sketch like this:
String readString;
void setup() {
//setup code
}
void loop() {
// Try this when you're reading inside the while client.connected loop instead of the above:
if (readString.length() < 100) {
readString += c;
Serial.print(c);
}
Here is a working example of the loop():
void loop() {
// Listen for incoming clients
WiFiClient client = server.available();
if (client) {
Serial.println("new client");
// An HTTP request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
//Serial.write(c);
// If you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply.
if (readString.length() < 100) {
readString += c;
Serial.print(c);
}
if (c == '\n' && currentLineIsBlank) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
client.println("<!DOCTYPE HTML>");
//send the HTML stuff
client.println("<html><head><title>Admin Web</title><style type=\"text/css\">");
client.println("body { font-family: sans-serif }");
client.println("h1 { font-size: 14pt; }");
client.println("p { font-size: 10pt; }");
client.println("a { color: #2020FF; }");
client.println("</style>");
client.println("</head><body text=\"#A0A0A0\" bgcolor=\"#080808\">");
client.println("<h1>Arduino Control Panel</h1><br/>");
client.println("<form method=\"link\" action=\"/unlockdoor\"><input type=\"submit\" value=\"Unlock Door!\"></form>");
client.println("<br/>");
client.println("</body></html>");
break;
}
if (c == '\n') {
// You're starting a new line.
currentLineIsBlank = true;
}
else if (c != '\r') {
// You've gotten a character on the current line.
currentLineIsBlank = false;
}
}
}
// Give the web browser time to receive the data.
delay(1);
// Close the connection:
client.stop();
Serial.println("client disonnected");
if (readString.indexOf("/unlockdoor") > 0)
{
unlockdoor();
Serial.println("Unlocked the door!");
}
readString = "";
}

Resources