Introduction: SIS
Wifi uploading multiple sensor data:
Step 1:
/*
1. Upload this code and open the serial monitor 2. On the serial monitor enter the command AT 3. If the response is OK, your esp8266 serial baud rate is 115200. Close this sketch and run the example code. Then on the void setup make this change: espSerial.begin(115200); and upload the code. If you want to change the speed to 9600 use the command AT+UART_CUR=9600,8,1,0,0
4. Otherwise if you can't see anything on the serial display reset the ESP8266 module change the esp8266 serial baud rate to 9600 or other, until you get a response. Then enter the command AT+UART_CUR=115200,8,1,0,0 to change the speed to 115200 *
/ AT Command to display the OK message // AT+GMR Command to display esp8266 version info // AT+UART_CUR=9600,8,1,0,0 Command to change the ESP8266 serial baud rate to 9600 // AT Command to change the ESP8266 serial baud rate to 115200 AT+UART_CUR=115200,8,1,0,0
// Hardware serial test - Arduino MEGA #include //Attention: For new DHT11 version library you will need the Adafruit_Sensor library //Download from here: https://github.com/adafruit/Adafruit_Sensor
//Attention: For new DHT11 version libraries you will need the Adafruit_Sensor library //Download from here:https://github.com/adafruit/Adafruit_Sensor //and install to Arduino software
#define DHTPIN 5 // Connect the signal pin of DHT11 sensor to digital pin 5 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE);
String apiKey = "EXUATURT9PJNWY3S"; // replace with your channel's thingspeak WRITE API key
String ssid="SSID"; // Wifi network SSID
String password ="XXXXXXX"; // Wifi network password
boolean DEBUG=true;
boolean thingSpeakWrite(float value1, float value2, int value3){
String cmd = "AT+CIPSTART=\"TCP\",\""; // TCP connection
cmd += "184.106.153.149"; // api.thingspeak.com
cmd += "\",80"; Serial1.println(cmd);
if (DEBUG) Serial.println(cmd);
showResponse(5000);
if(Serial1.find("Error")){
if (DEBUG) Serial.println("AT+CIPSTART error");
return false;
}
String getStr = "GET /update?api_key="; // prepare GET
string getStr += apiKey;
getStr +="&field1=";
getStr += String(value1);
getStr +="&field2=";
getStr += String(value2);
getStr +="&field5=";
getStr += String(value3);
// ...
getStr += "\r\n\r\n";
// send data length
cmd = "AT+CIPSEND=";
cmd += String(getStr.length());
Serial1.println(cmd);
if (DEBUG) Serial.println(cmd);
delay(100);
if(Serial1.find(">")){
Serial1.print(getStr);
if (DEBUG) Serial.print(getStr);
} else{
Serial1.println("AT+CIPCLOSE"); // alert user
if (DEBUG) Serial.println("AT+CIPCLOSE");
return false;
}
return true;
}
void showResponse(int waitTime){
long t=millis();
char c;
while (t+waitTime>millis()){
if (Serial1.available()){
c=Serial1.read();
if (DEBUG) Serial.print(c);
}
}
}
void setup() {
Serial.begin(9600);
Serial1.begin(115200); // or 115200
dht.begin(); // Start DHT
sensor pinMode(8, OUTPUT);
//espSerial.println("AT+RST"); // Enable this line to reset the module;
//showResponse(1000);
//espSerial.println("AT+UART_CUR=9600,8,1,0,0"); // Enable this line to set esp8266 serial speed to 9600 bps //showResponse(1000);
Serial1.println("AT+CWMODE=1"); // set esp8266 as client
showResponse(1000);
Serial1.println("AT+CWJAP=\""+ssid+"\",\""+password+"\""); // set your home router SSID and password showResponse(5000);
if (DEBUG) Serial.println("Setup completed"); }
void loop() {
float t = dht.readTemperature();
float h = dht.readHumidity();
int l = analogRead(A0); // read the value from the LDR
Serial.println("Light = "+String(l));
if (l < 100){
digitalWrite(8, HIGH);
} else {
digitalWrite(8, LOW);
}
if (isnan(t) || isnan(h)) {
if (DEBUG) Serial.println("Failed to read from DHT");
}
else {
if (DEBUG) Serial.println("Temp="+String(t)+" *C");
if (DEBUG) Serial.println("Humidity="+String(h)+" %");
thingSpeakWrite(t,h,l); // Write values to thingspeak
} // thingspeak needs 15 sec delay between updates,
delay(20000);
}
