SPARTAN Superway Personal Blog (Spring Week 4)

The team was looking into the Atting 841 and the needed communication protocol for the capacitors bank. The team also started to create a simple flowchart and a program draft for the slave attiny 841.

Attiny 841 running code

/* assume parallel Vcc to an analog pin;

Rx, Tx are binary numbers

PIN_A1, output binary as voltage #

PIN_A2, input as address */

#include <avr/sleep.h>

#include <EEPROM.h>

int addr = 0;

byte val;

byte target = 0;

int read_state = 0;

int voltage = 0;

const byte interruptPin = PIN_B0; // pin used for waking up

const byte receivingPin = PIN_A2; // Rx in 841

const byte transmittingPin = PIN_A1; // Tx in 841

const byte voltagePin = PIN_B1; // pin used to read voltage

void setup() {

    pinMode(receivingPin, INPUT);

    pinMode(interruptPin, INPUT);

    pinMode(transmittingPin, OUTPUT);

    pinMode(voltagePin, INPUT);

}

   

int wakeUpNow () {

    delayMicroseconds(200);

}

void sleepNow () {

    set_sleep_mode(SLEEP_MODE_PWR_DOWN);

    sleep_enable();

    attachInterrupt(digitalPinToInterrupt(interruptPin), wakeUpNow, RISING);

    sleep_mode();

    sleep_disable();

    detachInterrupt(digitalPinToInterrupt(interruptPin)); //turn off the interrupt

}

void loop() {

    val = EEPROM.read(addr); //obtain address value

    target = Serial.read(receivingPin); //obtain target value from the master

    if (addr == target) {

        voltage = Serial.read(voltagePin); //read voltage

        analogWrite(transmittingPin, voltage); //output voltage value to Tx

    }

    sleepNow(); // sleep function called here

    }