vbox-firmware/BoxmodFirmware.ino

#include "src/Btn/Btn.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSans9pt7b.h>
#include <algorithm>

#define SSD1306_NO_SPLASH
#define SCREEN_WIDTH 96
#define SCREEN_HEIGHT 16
#define OLED_RESET    -1  // Pas de reset matériel
#define SCREEN_ADDRESS 0x3C  // Adresse I2C (à confirmer avec un scanner I2C)

// only for debuging
#define LED_PIN 13

#define batVcheckMesurePin 14
#define batVcheckActivatePin 42

#define coilVcheckMesurePin1 15
// #define coilVcheckMesurePin2 16
#define coilRcheckActivatePin 16


int bat_prct = 100;
float coil_res = 1.1;
float coil_pw = 17.8;

Btn plusBtn(6, 50);
Btn moinsBtn(7, 50);
Btn fireBtn(17, 50);


Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  SerialUSB.begin(115200);
  // while (!SerialUSB);             // Leonardo: wait for serial monitor
  SerialUSB.println("\nBoxmodFirmware");

  // debug led for fire btn
  pinMode(LED_PIN, OUTPUT);
  analogWrite(LED_PIN, 0);

  // battery voltage check
  pinMode(batVcheckActivatePin, OUTPUT);
  digitalWrite(batVcheckActivatePin, HIGH);
  pinMode(batVcheckMesurePin, INPUT);

  // coil restistance check
  pinMode(coilRcheckActivatePin, OUTPUT);
  digitalWrite(coilRcheckActivatePin, HIGH);
  pinMode(coilVcheckMesurePin1, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {  
    SerialUSB.println(F("Échec de l'initialisation de l'écran OLED"));
    // while (true);  // Boucle infinie en cas d'échec
  }

  display.clearDisplay();
  delay(500);
  display.setRotation(2);
}


void drawScreen() {
  display.clearDisplay();


  display.setTextColor(SSD1306_WHITE); 
  
  // battery
  display.setTextSize(1);      
  display.setCursor(0, 0);     
  display.print(String(bat_prct)+"%");
  // display.drawRect(0, 0, 39, 69, SSD1306_WHITE);  // Rectangle vide
  // display.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, SSD1306_WHITE);  // Rectangle rempli

  // coil resistance
  display.setTextSize(1);
  display.setCursor(0, 8);
  // display.print(String(coil_res)+"Ω");
  char coil_res_output[3];  // Adjust size accordingly
  sprintf(coil_res_output, "%.1f\xE9", coil_res);  // Format float with 1 decimal place
  display.print(coil_res_output);
  
  // power
  display.setTextSize(2);
  display.setCursor(30, 0);     
  // display.print(String(coil_pw)+"W");
  char coil_pw_output[4];  // Adjust size accordingly
  sprintf(coil_pw_output, "%.1fw", coil_pw);  // Format float with 1 decimal place
  display.print(coil_pw_output);
  
  display.display();  // Rafraîchir l'écran

}

void checkBatteryVoltage(){
  // res bridge
  // Vout = Vin * (R2 / (R1 + R2))
  // R2 = (Vout / Vin) * R1
  // vout should be btw 1.5V & 2.1V
  // https://docs.arduino.cc/language-reference/en/functions/analog-io/analogReadResolution
  analogReadResolution(12); // btw 0 & 4095
  // https://docs.arduino.cc/language-reference/en/functions/analog-io/analogReference/
  analogReference(AR_INTERNAL2V23);

  digitalWrite(batVcheckActivatePin, LOW);
  int batv_mesure = analogRead(batVcheckMesurePin);
  digitalWrite(batVcheckActivatePin, HIGH);
  SerialUSB.print("batv_mesure: ");
  SerialUSB.print(batv_mesure);

  double batv = (batv_mesure * 2.23/4095.0)*2;
  SerialUSB.print(", batv: ");
  SerialUSB.print(batv);
  SerialUSB.println("V");
  // range of 3.4V to 4.1V
  bat_prct = (batv - 3.4) / (4.1 - 3.4) * 100;
  // Clamp the percentage to [0, 100]
  bat_prct = constrain(bat_prct, 0, 100);
}

void checkCoilResistance(){
  analogReadResolution(12); // btw 0 & 4095
  analogReference(AR_DEFAULT);

  // measuring the analog input of voltage
  digitalWrite(coilRcheckActivatePin, LOW);
  delay(1000);
  #define NUM_SAMPLES 30
  int readings[NUM_SAMPLES];
  for (size_t i = 0; i < NUM_SAMPLES; i++)
  {
    readings[i]= analogRead(coilVcheckMesurePin1);
    delay(10);
  }
  digitalWrite(coilRcheckActivatePin, HIGH);
  // coilV_measure = coilV_measure/range;
  std::sort(readings, readings + NUM_SAMPLES);
  int coilV_measure = readings[NUM_SAMPLES / 2];
  SerialUSB.print("coilV_measure: ");
  SerialUSB.print(coilV_measure);
  
  const double vref = 3.30000;
  const double r_one = 1.070000;

  // converting adc to volt
  // 2.48/3.05 = 0.8131
  const double adc_correction = 0.8131;
  double v_two = (coilV_measure * vref/4095.000000) * adc_correction;
  SerialUSB.print(", v_two: ");
  SerialUSB.print(v_two, 6);
  SerialUSB.print("V");

  // calculate voltage accross know res
  double v_one = vref - v_two;
  SerialUSB.print(", v_one: ");
  SerialUSB.print(v_one);
  SerialUSB.print("V");

  // calculate current
  double i = v_one / r_one;
  SerialUSB.print(", i: ");
  SerialUSB.print(i,6);
  SerialUSB.print("A");

  // calculate Ohm
  double r_two = v_two/ i;
  SerialUSB.print(", r_two: ");
  SerialUSB.print(r_two);
  SerialUSB.println("Ohm");

  // coil_res = (3.3 - v_two)-1);
  // coil_res = (3.3 - v_two) * 14.9;

  coil_res = r_two;
  // SerialUSB.print(", coil_res: ");
  // SerialUSB.print(coil_res);
  // SerialUSB.println("Ohm");
}

void loop() {
  if(plusBtn.getStateOnce() == 0){
    SerialUSB.println("Plus");
    coil_pw+=0.1;
    if (coil_pw >= 20){
      coil_pw = 20;
    }
  }

  if(moinsBtn.getStateOnce() == 0){
    SerialUSB.println("Moins");
    coil_pw-=0.1;
    if (coil_pw <= 5){
      coil_pw = 5;
    }
  }

  if(fireBtn.getState() == 0){
    analogWrite(LED_PIN, 255);
  }else{
    analogWrite(LED_PIN, 0);
  }

  if (fireBtn.getStateOnce() == 0){
    checkBatteryVoltage();
    delay(1000);
    checkCoilResistance();
  }
  

  drawScreen();
}