Lost connection when communicating ESP with Android device
Posted: Sun Feb 12, 2017 1:46 pmHi i have a little issues. I created the kettle controlled over Wi-Fi. I used Wi_fi module ESP8266, Arduino , water sensor, relay and temperature sensor. Kettle works fine at first start, so everything I have in code for Arduino works properly. Only problem is when i need to get data to Android app over Wi-Fi. I used AsyncTask client in the application and sometimes i can't connect to my kettle or when I want to get actual temperature it goes well for example for 20°C but then the actuall temperature stucks there. When this occurs I re-open the app connect again and then it works again. The kettle switches off correctly so the android is sending right data only the connection between ESP8266 and Android app is a bit buggy. Is there ony other possibility to establish stable communication between ESP and Android to send right data for full cycle ? I tried everything but this WiFi module allways stopos communicate with android
Code: Select all
#include <OneWire.h>
OneWire ds(9);
int nPinWaterState = 8;
int nPinRelayState = 7;
byte addr[8];
bool bRelay=false;
bool bWater=true;
int nTemp=0;
int nFinishTemp=-1;
void setup()
void setup()
{
Serial.begin(9600);
InitDS18B20();
pinMode(nPinWaterState, INPUT);
pinMode(nPinRelayState, OUTPUT);
digitalWrite(nPinRelayState,HIGH);
sendData("AT+RST\r\n",1000);
sendData("AT+CWSAP=\"Kettle\",\"123\",3,0\r\n",200);
sendData("AT+CWMODE=2\r\n",200);
sendData("AT+CIPAP=\"192.168.0.100\"\r\n",200);
sendData("AT+CWDHCP=0,1\r\n",200);
sendData("AT+CIPMUX=1\r\n",200);
sendData("AT+CIPSERVER=1,8888\r\n",200);
}
void loop()
{
ReadSensors();
if(!bWater || nTemp>=nFinishTemp)
{
bRelay=false;
}
if(Serial.available())
{
if(Serial.find((char*)"+IPD,"))
{
String strRead =Serial.readStringUntil('\n');
int connectionId=strRead[0]-48;
if(Serial.find((char*)"AND:"))
{
strRead=Serial.readStringUntil('\n');
nFinishTemp=strRead.substring(1,4).toInt();
if(strRead[0]=='T')
{
if(bWater && nTemp<nFinishTemp)
{
bRelay=true;
}
}
else
{
bZap=false;
}
}
String strSend = "KET:";
if(bRelay)
{
strSend=strSend+'T';
}
else
{
strSend=strSend+'F';
}
if(bWater)
{
strSend=strSend+'T';
}
else
{
strSend=strSend+'F';
}
char strTemp[3];
sprintf (strTemp, "%03d",nTemp);
strSend=strSend+strTemp;
String cipSend = "AT+CIPSEND=";
cipSend += connectionId;
cipSend += ",";
cipSend +=strSend.length();
cipSend +="\r\n";
sendData(cipSend,20);
sendData(strSend,20);
String closeCommand = "AT+CIPCLOSE=";
closeCommand+=connectionId;
closeCommand+="\r\n";
sendData(closeCommand,20);
}
}
if (bRelay)
{
digitalWrite(nPinRelayState,LOW);
}
else
{
digitalWrite(nPinRelayState,HIGH);
}
}
String sendData(String command, const int timeout)
{
String response = "";
Serial.print(command);
long int time = millis();
while( (time+timeout) > millis())
{
while(Serial.available())
{
char c = Serial.read();
response+=c;
}
}
return response;
}
void ReadSensors(void)
{
float tempC;
tempC=ReadDS18B20();
nTemp=(int)tempC;
bWater = !digitalRead(nPinWaterState);
}
void InitDS18B20(void)
{
if ( !ds.search(addr)) {
ds.reset_search();
delay(100);
return;
}
if (OneWire::crc8(addr, 7) != addr[7]) {
return;
}
}
float ReadDS18B20(void)
{
byte i;
byte present = 0;
byte data[12];
float celsius;
ds.reset();
ds.select(addr);
ds.write(0x44, 1);
delay(100);
present = ds.reset();
ds.select(addr);
ds.write(0xBE);
for ( i = 0; i < 9; i++) {
data[i] = ds.read();
}
int16_t raw = (data[1] << 8) | data[0];
byte cfg = (data[4] & 0x60);
if (cfg == 0x00) raw = raw & ~7;
else if (cfg == 0x20) raw = raw & ~3;
else if (cfg == 0x40) raw = raw & ~1;
celsius = (float)raw / 16.0;
return(celsius);
}