Test a TILT!Audio board

In order to test your TILTAudio board including the WPC bus interface to the pinball machine you can use an arduino mega board.

Just connect the mega with the TILT!Audio board like this:

Connections from the Arduino mega to WPC bus on TILT!Audio

Connecting also the 5v power line is optional. You need to choose either to power everything from on source or just skip the red 5v wire and power the 5v on the TA board and the Arduino separately.

For the address decoder (the smd chips) to work the raspberry pi needs to be plugged in as the 3v3 power for the decoder comes from the pi’s onboard regulator.

Also the resistor network RN3-5 must be installed, without them bus connections are not there. 12V can be skipped for testing, which means amps will not work, but you could also connect a speaker either to the PI’s audio jack directly or use the audio jack on the DAC module.

Then load the following ino script to the Arduino:

void setup() {
   // set gpio mode
   DDRC = 255; // switch port c completely to output
   DDRA = 255; // switch port a completely to output
   PORTA = 255; // high
   PORTC = 255; // high
   pinMode(LED_BUILTIN, OUTPUT);
}
int data[] = { 0x01, 0x20, 0, 0 };
int ledState = 0;
void play(int start, int end ) {
   for( int i = start; i <= end; i++ ) {
     delayMicroseconds(900);
     PORTA = data[i];
     PORTC = 0b01011100;      // sound address + rw = low, with wden high
     delayMicroseconds(20);
     PORTC = 0b00011100;      // sound address + rw = low, with wden low
     delayMicroseconds(30);
     PORTC = 0b01011100;      // sound address + rw = low, with wden high
   }
}
void toggleLed() {
   digitalWrite(LED_BUILTIN, ledState);
   ledState = !ledState;
}

void loop() {
  play(0,1);
  delay(2000);
  toggleLed();
  data[2] = random(4);
  data[3] = random(256);
  play(2,3);
  delay(4000);
}

void setup() {

// set gpio mode

DDRC = 255; // switch port c completely to output

DDRA = 255; // switch port a completely to output

PORTA = 255; // high

PORTC = 255; // high

pinMode(LED_BUILTIN, OUTPUT);

}

int data[] = { 0x01, 0x20, 0, 0 };

int ledState = 0;

void play(int start, int end ) {

for( int i = start; i <= end; i++ ) {

delayMicroseconds(900);

PORTA = data[i];

PORTC = 0b01011100; // sound address + rw = low, with wden high

delayMicroseconds(20);

PORTC = 0b00011100; // sound address + rw = low, with wden low

delayMicroseconds(30);

PORTC = 0b01011100; // sound address + rw = low, with wden high

}

void toggleLed() {

digitalWrite(LED_BUILTIN, ledState);

ledState = !ledState;

}

void loop() {

play(0,1);

delay(2000);

toggleLed();

data[2] = random(4);

data[3] = random(256);

play(2,3);

delay(4000);

}

This way you can emulate sound effect commands to would normally come from the pinball machine.

I will upload a more detailed example on the github repo: https://github.com/sker65/tiltaudio-extensions

Connections needed:

Arduino	TILT!Audio
PA0:22	CD0 wpc15
PA1:23	CD1 wpc13
PA2:24	CD2 wpc11
PA3:25	CD3 wpc9
PA4:26	CD4 wpc7
PA5:27	CD5 wpc5
PA6:28	CD6 wpc3
PA7:29	CD7 wpc1
PC0:37	CA0 wpc25
PC1:36	CA1 wpc23
PC2:35	CA2 wpc21
PC3:34	CA3 wpc19
PC4:33	CA4 wpc17
PC5:32	RW:wpc31
PC6:31	WDEN:wpc29
GND	GND