ESP8266 Write Multiple Fields Thingspeak.com
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#include <ESP8266WiFi.h> #include "secrets.h" #include "ThingSpeak.h" // include thingspeak header #include <math.h> char ssid[] = SECRET_SSID; // your network SSID (name) char pass[] = SECRET_PASS; // your network password int keyIndex = 0; // your network key Index number (needed only for WEP) WiFiClient client; unsigned long myChannelNumber = SECRET_CH_ID; const char * myWriteAPIKey = SECRET_WRITE_APIKEY; // Schematic: // [+3V] ---- [Thermistor 10k-Resistor] -------|------- [10k-Resistor] ---- [Ground] // | // Analog Pin A0 int analogpin = A0; int sensorvalue; float Vin; float Temp_C; // Celsius float Temp_K; // Kelvin float Temp_F; // Fahrenheit //***************************************************************************************************** float Thermistor(int RawADC){ //Function to perform math of the Steinhart-Hart equation Temp_C = log(((10230000/RawADC)-10000)); // Temp = log(10000.0*((1023.0/RawADC-1))); Temp_C = 1/(0.001129148+(0.000234125+(0.0000000876741*Temp_C*Temp_C))*Temp_C); Temp_C = Temp_C - 273.15; // Convert Kelvin to Celsius return Temp_C; } //***************************************************************************************************** // Initialize values int number1 = 0; int number2 = 0; int number3 = 0; int number4 = 0; String myStatus = ""; //***************************************************************************************************** void setup() { Serial.begin(115200); // Initialize serial while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo native USB port only } WiFi.mode(WIFI_STA); ThingSpeak.begin(client); // Initialize ThingSpeak } //***************************************************************************************************** void loop() { // Connect or reconnect to WiFi if(WiFi.status() != WL_CONNECTED){ Serial.print("Attempting to connect to SSID: "); Serial.println(SECRET_SSID); while(WiFi.status() != WL_CONNECTED){ WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network Serial.print("."); delay(5000); } Serial.println("\nConnected."); } //**************************************************************************************************** Vin = sensorvalue*(3.0/1023.0); sensorvalue = analogRead(analogpin); Temp_C = Thermistor(sensorvalue); // Temp_C = Thermistor(analogRead(analogpin)); Temp_K = Temp_C + 273.15; // Convert Kelvin to Celcius Temp_F = (Temp_C*1.8) + 32.0; // Convert Celsius to Fahrenheit Serial.print("ADC Sensor Value\t"); Serial.print(sensorvalue); Serial.print("\t"); Serial.print("Voltage input\t"); Serial.print(Vin); Serial.print("\t"); Serial.print("Temperature Celsius\t"); Serial.print(Temp_C); Serial.print("\t"); Serial.print("Temperature Kelvin\t"); Serial.print(Temp_K); Serial.print("\t"); Serial.print("Temperature Fahrenheit\t"); Serial.print(Temp_F); Serial.println("\t"); number1 = sensorvalue; number2 = Vin; number3 = Temp_C; number4 = Temp_K; //**************************************************************************************************** // set the fields with the values ThingSpeak.setField(1, number1); ThingSpeak.setField(2, number2); ThingSpeak.setField(3, number3); ThingSpeak.setField(4, number4); //**************************************************************************************************** // figure out the status message if(number1 > number2){ myStatus = String("field1 is greater than field2"); } else if(number1 < number2){ myStatus = String("field1 is less than field2"); } else{ myStatus = String("field1 equals field2"); } //**************************************************************************************************** // set the status ThingSpeak.setStatus(myStatus); //**************************************************************************************************** // write to the ThingSpeak channel int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); if(x == 200){ Serial.println("Channel update successful."); } else{ Serial.println("Problem updating channel. HTTP error code " + String(x)); } //**************************************************************************************************** delay(5000); // Wait 5 seconds to update the channel again //**************************************************************************************************** } |
Channel update successful.
ADC Sensor Value 585 Voltage input 1.72 Temperature Celsius 31.73 Temperature Kelvin 304.88 Temperature Fahrenheit 89.11
Problem updating channel. HTTP error code -401
https://thingspeak.com/channels/1452499