This week mike takes a look at some viewer requests.  One a complete failure and the other may be working, but if it is working it is weird.

Downloads

Wireless Keypad Remote

#define PIN_D2_INT      0

// R06A defines - wired to Digital Arduino pins
// Wire the R06A per this assignment
#define R06A_VT 2    // used for INT0
#define R06A_D0 3
#define R06A_D1 4
#define R06A_D2 5
#define R06A_D3 6

int r06a_0, r06a_1, r06a_2, r06a_3 = 0; // storage for data states
int dirty = 0;                          // interrupt has occurred flag

// Interrupt Service Routine attached to INT0 vector
void pinD2ISR()
{
    // Provide a visual clue of the interrupt
    digitalWrite(13, !digitalRead(13));  // Toggle LED on pin 13
    // Grab the data states
    r06a_0 = digitalRead(R06A_D0);      // Grab data for later consumption in loop()
    r06a_1 = digitalRead(R06A_D1);
    r06a_2 = digitalRead(R06A_D2);
    r06a_3 = digitalRead(R06A_D3);
    dirty = 1;                          // flag interrupt occurance
}

void setup()
{
 attachInterrupt(PIN_D2_INT, pinD2ISR, RISING);        // Set D2 interrupt

 // setup the R06A decoder connections
 pinMode(R06A_D0, INPUT);
 pinMode(R06A_D1, INPUT);
 pinMode(R06A_D2, INPUT);
 pinMode(R06A_D3, INPUT);

 Serial.begin(9600);
}

void loop()
{
 if(dirty)
 {
    dirty = 0;              // clear interrupt occurance flag
    Serial.print(r06a_0 ? "HIGH": "LOW ");
    Serial.print(r06a_1 ? "HIGH": "LOW ");
    Serial.print(r06a_2 ? "HIGH": "LOW ");
    Serial.print(r06a_3 ? "HIGH": "LOW ");
    Serial.println("");
 }
}

Wireless Transmitter

int seconds = 0;

void setup()
{
Serial.begin(2400); // Bits per sec
}

void loop()
{
 Serial.print(seconds);
 ++seconds;
 if (seconds >= 255)
    seconds = 0;

 delay(1000);
}

Wireless Receiver

int seconds = 0;

void setup()
{
 Serial.begin(2400);
}

void loop()
{
 char ch;
 if (Serial.available())      // is there anything to be read from serial port?
 {
    ch = Serial.read();        // read a single letter
   
    // print out to serial port the character we just read
    Serial.print(ch, DEC);
 }

}