Experimenting with Thingspeak and ESP8266

#include <ESP8266WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include “ThingSpeak.h”

const int LDR = A0; //ADC0
const int BUTTON = 4; //GPIO4
const int RED = 15;  //GPIO15
const int GREEN = 12; //GPIO12
const int BLUE = 13; //GPIO13
const int ONE_WIRE_BUS_PIN = 2; //GPIO2
const int ONE_WIRE_BUS_PWR = 0; //GPIO0

unsigned long myChannelNumber = YourThingspeakChannelNumber;
const char * myWriteAPIKey = “YourThingspeakAPI”;

OneWire ow(ONE_WIRE_BUS_PIN);
DallasTemperature sensors(&ow);
WiFiClient wifiClient;

#define SSID “YourSSID”
#define PASS “YourPASS”

int status = WL_IDLE_STATUS;

void setup()
{
pinMode(LDR, INPUT);
pinMode(BUTTON, INPUT);
pinMode(RED, OUTPUT);
pinMode(GREEN, OUTPUT);
pinMode(BLUE, OUTPUT);
pinMode(ONE_WIRE_BUS_PWR, OUTPUT);

digitalWrite(RED, HIGH);
digitalWrite(GREEN, LOW);
digitalWrite(BLUE, LOW);
digitalWrite(ONE_WIRE_BUS_PWR, HIGH); //we are powering the sensor from a GPIO to make wiring easier

Serial.begin(115200);
Serial.println();

//connect to wifi network
WiFi.begin(SSID, PASS);
Serial.print(“Connecting to “);
Serial.println(SSID);

while (WiFi.status() != WL_CONNECTED){
delay(250);
digitalWrite(RED, HIGH);
delay(250);
digitalWrite(RED, LOW);
Serial.print(“.”);
}

Serial.println();

Serial.print(“Connected, IP address: “);
Serial.println(WiFi.localIP());
Serial.print(“Signal strength (RSSI):”);
Serial.print(WiFi.RSSI());
Serial.println(” dBm”);

digitalWrite(BLUE, HIGH);

ThingSpeak.begin(wifiClient);
sensors.begin();
}

void loop(){
float light;

// check for incoming bytes from the server and print them to serial port
while (wifiClient.available()) {
char c = wifiClient.read();
Serial.write(c);
}

Serial.print(“Requesting temperatures…”);
sensors.requestTemperatures(); //globally read the temperature sensors
Serial.println(“DONE”);

Serial.print(“Temperature for Device 0 (Outside) is: “);
float tempOutsideC = sensors.getTempCByIndex(0);
ThingSpeak.setField(2, tempOutsideC);
Serial.println(tempOutsideC);

Serial.print(“Temperature for Device 1 (Fish) is: “);
float tempFishC = sensors.getTempCByIndex(1);
ThingSpeak.setField(1, tempFishC);
Serial.println(tempFishC);

Serial.print(“Light percent is: “);
light = analogRead(LDR);
//convert light to percent
light = light * 100;
light = light / 1024;
ThingSpeak.setField(3, light);
Serial.println(light);

digitalWrite(BLUE, LOW);
digitalWrite(GREEN, HIGH);

Serial.print(“Sending data to Thingspeak…”);
ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
Serial.println(“DONE”);
Serial.println(“”);

digitalWrite(BLUE, HIGH);
digitalWrite(GREEN, LOW);
delay(20000);    //must not push data more often that 15 seconds!
}