Skip to content

Instantly share code, notes, and snippets.

@theKlanc

theKlanc/tinyADC.ino

Created January 11, 2022 23:22
Show Gist options
  • Save theKlanc/5943525d38695a6b8d40c7e332a8419c to your computer and use it in GitHub Desktop.
Save theKlanc/5943525d38695a6b8d40c7e332a8419c to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. theKlanc created this gist Jan 11, 2022.
    56 changes: 56 additions & 0 deletions tinyADC.ino
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,56 @@
    const int pulsePin = 4;
    const analog_pin_t readPin = A3;
    //const unsigned pulseWidthMicros = 10000;
    const unsigned pulseWidthMicros = 3000;

    void setup() {
    pinMode(pulsePin, OUTPUT);
    digitalWrite(pulsePin, LOW);
    pinMode(readPin, INPUT);
    }

    void writeBit(bool bit, int pin){
    digitalWrite(pin, HIGH);
    delayMicroseconds(pulseWidthMicros);
    digitalWrite(pin, bit);
    delayMicroseconds(pulseWidthMicros);
    digitalWrite(pin, LOW);
    delayMicroseconds(pulseWidthMicros);
    }

    void writeSync(int pin){
    writeBit(LOW, pin);
    digitalWrite(pin, HIGH);
    delayMicroseconds(pulseWidthMicros);
    delayMicroseconds(pulseWidthMicros);
    delayMicroseconds(pulseWidthMicros);
    digitalWrite(pin, LOW);
    delayMicroseconds(pulseWidthMicros);
    }

    bool calculateParity(int16_t data){
    bool result = false;
    for(int i = 0; i < 16; ++i){
    ┊ if(data & 0b1){
    ┊ ┊ result = !result;
    ┊ }
    ┊ data = data >> 1;
    }
    return result;
    }

    void writeData(int16_t data, int pin){
    bool parity = calculateParity(data);
    writeSync(pin);
    for(int i = 0; i < 16; ++i){
    ┊ writeBit(data & 0b1, pin);
    ┊ data = data >> 1;
    }
    writeBit(parity, pin);
    }

    void loop() {
    delayMicroseconds(pulseWidthMicros * 3);
    int16_t battLvl = analogRead(readPin);
    writeData(battLvl, pulsePin);
    }