// This #include statement was automatically added by the Particle IDE.
#include "ThingSpeak/ThingSpeak.h"
#include <math.h>

// Change A1 to the specific analog pin you connected your potentiometer to.
int sense=A1;
float reading;
float velocity=10;
// If you are going to calibrate your sensor you should change these parameters to the ones you found. The formula used is y = a*x^2 + b*x + c
float a=-0.00000056952223162858;
float b=0.00091894447761036379;
float c=0.06843175336954335200;

TCPClient client;

// Specify your own channelnumber and API key here. These are found at your Thingspeak Channel.
unsigned long myChannelNumber = YourChannelID;
const char * myWriteAPIKey = "YourAPIkeyHere";

void setup() {
    ThingSpeak.begin(client);
}

void loop() {
    reading=analogRead(sense);
    velocity=a*pow(reading,2)+b*reading+c;
    if (reading > 807) {
        velocity=0.4391;
    }
    // Write to ThingSpeak. There are up to 8 fields in a channel, allowing you to store up to 8 different
    // pieces of information in a channel.  Here, we write to field 1.
    ThingSpeak.writeField(myChannelNumber, 1, velocity, myWriteAPIKey);
    delay(1000);
}