Go Down

### Topic: Midi Clock (Read 1 time)previous topic - next topic

#### edward11

##### Dec 20, 2012, 07:16 pm
Hello,

I'm working on a project regarding midi clock. I'm trying to read the clock bytes that ableton live sends and do something with that. I'm using this circuit - probably a familiar one .

http://blog.makezine.com/2008/06/03/arduino-basics-midi-clock/

Little-scale provided the code:

Code: [Select]
`byte midi_start = 0xfa;byte midi_stop = 0xfc;byte midi_clock = 0xf8;byte midi_continue = 0xfb;int play_flag = 0;byte data;void setup() {Serial.begin(31250);pinMode(13, OUTPUT);}void loop() {if(Serial.available() > 0) {data = Serial.read();if(data == midi_start) {play_flag = 1;}else if(data == midi_continue) {play_flag = 1;}else if(data == midi_stop) {play_flag = 0;}else if((data == midi_clock) && (play_flag == 1)) {Sync();}} }void Sync() {// do something for every MIDI Clock pulse when the sequencer is runningdigitalWrite(13, HIGH);delay(10);digitalWrite(13, LOW);delay(10);}`

I can't get it to work. I tried the obvious things:
- switched the midi jack around (i wasn't certain whether the front was drawn in the picture or the back)
- checked the midi cable (the midi out light flashes, so it must receive some kind of signal?)
- measured the voltage across the two midi din jack legs. The voltage was very low: in the order of 30 milliVolts. I would expect the voltage to be way higher.
- measured the voltage across the +5 and ground (haha this was just 5
- measured the voltage across the Rx wire and the ground. This was also very low, also about 30 milliVolts.

Now i don't know exactly what voltage levels i should expect, but 30 milliVolts seems kinda low. Also the signal coming from the jack is steady. If ableton sends bytes for every clock pulse, wouldn't that result in a changing signal?

Any help would be greatly appreciated!

Go Up

Please enter a valid email to subscribe