mux.cpp

#include <Arduino.h>

#define CH1_SENSE A6

#define MUX_SELECT_0 4
#define MUX_SELECT_1 5

void selectInput(uint8_t n)
{
  int val_select_0 = LOW;
  int val_select_1 = LOW;

  if ((n >> 0) & 1)
  {
    val_select_0 = HIGH;
  }
  if ((n >> 1) & 1)
  {
    val_select_1 = HIGH;
  }

  // Serial.println(val_select_0);
  // Serial.println(val_select_1);

  digitalWrite(MUX_SELECT_0, val_select_0);
  digitalWrite(MUX_SELECT_1, val_select_1);
}

void setup()
{
  pinMode(MUX_SELECT_0, OUTPUT);
  pinMode(MUX_SELECT_1, OUTPUT);

  selectInput(0);

  Serial.begin(115200);
  delay(2000);
  Serial.println("Testing Pyro Channel");
}

void loop()
{
  Serial.print("CH1 Sense = ");
  Serial.print((float)analogRead(CH1_SENSE) * 3.3 / 1024.0, 5);
  Serial.println(" V");
  delay(1000);
}