Fuel Sensor How to build

Items required

XC GUIDE APP from the App Store (Big shout to Indy for implementing the fuel meter)

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GXAirCom flashed to your TTGO Tbeam

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1 - Soldering Iron :-)

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1 - ESP32 i have used the Mini D1 ESP32

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1 - Flow wheel - https://www.espares.co.uk/product/es1641676?utm_source=google+shopping&utm_medium=shopping&utm_campaign=google+shopping&gclid=CjwKCAjwjJmIBhA4EiwAQdCbxkue9sBWNuHNK3zKw4mz_ESBOcyvGExMezZdTvk3wqIqh3EvGAOd_BoCmz0QAvD_BwE

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1 - Some Cable

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1- Watch the 2 videos https://youtu.be/dLdJXD1AKps and https://youtu.be/Fat-BHZ7MAQ

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1 - Read through the code :-)

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/* Fuel sensor code v1.00
 * Matthew Austen 
 * All i ask is you sub the Parahooners on youtube :-) https://www.youtube.com/c/Parahooners
 * Using as esp32 board connected to the TTGO 3v out Ground and Pin25 which is the Dac Pin
 * as the pulses from the flow wheel increase the Dac pin is set to voltage for the TTGO to read this is then transmitted to the XC Guide app where you need to set up the
 * basics - this sketch is set to 12ltrs and the pulses are the amount it takes for 1000ml or 1ltr this is then multiplied by the 
 * litres and divided by the calculate which is the DAC pin value - the DAC pin ranges from 0 to 255 this wave is used over PPM for it sine wave which can be read
 * with out error by the TTGO
 * 
 * The flow sensor is connected via the 3v and ground and the pulse pin is connected to pin 23 as an interrupt 
 * every time the pin is logged as high the pulse is counted in the flow counter / if the flow counter is less than 5 the sensors becomes static
 * this has been done as the value of the DAC will reset showing a 255 value..
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software. 

  https://www.youtube.com/c/Parahooners

  https://www.youtube.com/c/Parahooners

  https://www.youtube.com/c/Parahooners
 */
 


#include <driver/dac.h>
#define DAC1 25



const int  FlowPin = 23; 
int FlowCounter = 0;   // counter for the number of button presses 
int Calculate = 255; // this is the DAC Resolution
int pulses = 2020;  // pulese per 1000ml
int Liters = 12; // how many liters are you flying with
int Resolution = Liters * pulses / Calculate ; 
int FlowState = 0;         // current state of the flow sensor
int LastFlowState = 0;     // previous state of the flow sensor

void setup() {
  Serial.begin(9600);
  
  pinMode(FlowPin, INPUT); //Sets sensor as input
  
}
void loop() {
  
  FlowState = digitalRead(FlowPin);
     // compare the buttonState to its previous state
  if (FlowState != LastFlowState) {
    // if the state has changed, increment the counter
    if (FlowState == HIGH) {
      // if the current state is HIGH then the button went from off to on:
      FlowCounter++;
      Serial.println("");
      Serial.print("Flow pulse: "); // use this to see how many pulses to 1000lm then set the int Variable to this amount
      Serial.println(FlowCounter);
    } else {
      Serial.println("no pulses");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  LastFlowState = FlowState;

  // Generate a Sine wave
  float Value = Calculate - (FlowCounter / Resolution) ; //255= 3.3V 128=1.65V

   if (Value > 4 ) { dacWrite(DAC1, Value);}
    Serial.print("DAC Value: "); // use this to see how many pulses to 1000lm then set the int Variable to this amount
      Serial.println(Value);
  
  
}