I keep getting the Compilation error: call of overloaded 'setField(int, double&)' is ambiguous when setting fields in my TS channel

I keep getting the same error "Compilation error: call of overloaded 'setField(int, double&)' is ambiguous" whenever I try to compile my code. It only works when I set the first field WATER_TEMP but when I set the second field which is the PH_LEVEL it doesn't compile. I don't know what I'm doing wrong because the code works, the only error is when I set the PH_LEVEL field.

Context: I am using an ESP32 board, I connected my PH Sensor to GPIO36 for data. My sensors work, I can see the results in the serial monitor. But everytime I set the second field, it keeps failing to compile.

This is my code:

#include <OneWire.h>
#include "WiFi.h"
#include <WiFiClient.h>
#include "ThingSpeak.h"
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 4 // PIN FOR WATER TEMPERATURE SENSOR


const char* ssid = "xxxxxxxxxxxxxxx";   //My Network SSID
const char* password = "xxxxxxxxxx";     //My Network Password


OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
int PH_ANALOG_PIN = 36;
int sample = 10; 
float adcRes = 1024.0; 
WiFiClient client;
unsigned long myChannelNumber = xxxxx; 
const char * myWriteAPIKey = "xxxxxxxxxx"; 


void setup() {
Serial.begin(9600);
sensors.begin();
WiFi.begin(ssid, password);
ThingSpeak.begin(client);
}

void loop() {
//PH LEVEL CODE:
int measure = 0;
for(int i=0; i<sample; i++){
    measure += analogRead(PH_ANALOG_PIN); 
    delay (100);
    }
    float volt = 5/adcRes*measure/sample;
    double PH_LEVEL = -5.70 * (float)volt + 31.27;
    Serial.print("ph:");
    Serial.print(PH_LEVEL);
    delay(1000);
    //WATER TEMPERATURE CODE:
    sensors.requestTemperatures(); // Send the command to get temperature readings
    float WATER_TEMP = sensors.getTempCByIndex(0); // Get the temperature in Celsius
    if (WATER_TEMP != DEVICE_DISCONNECTED_C) {
        Serial.print("Water Temperature: ");
        Serial.print(WATER_TEMP);
        } else {
            Serial.print("Error: Unable to read temperature!");
            }
        
        // set the fields with the values
        ThingSpeak.setField(1, WATER_TEMP);
        ThingSpeak.setField(2, double(PH_LEVEL)); //THIS IS THE ONLY LINE THAT KEEPS MY      SKETCH FROM COMPILING
        
        ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
        delay(3000); 
        
        
        } //END OF LOOP
        float readTemperature()
        {
            float WATER_TEMP = sensors.getTempCByIndex(0); // Get the temperature in Celsius
            }
        

Answer 1

[Shakthi Varun]

setField function only takes int, long and float as the second argument. The below line should work.

ThingSpeak.setField(2, float(PH_LEVEL)); 

Answer 2

[Christopher Stapels]

Try setting the value first in this line:

ThingSpeak.setField(2, double(PH_LEVEL)); 

e.g.

double myLevel=double(PH_LEVEL);
ThingSpeak.setField(2, myLevel);