mercredi 5 octobre 2011

autoshutdown

The Speak and spell got a anoying feature, the autoshutdown when no button is pressed.
By using the arduino Speak and Spell interface, we inject signals directly into the speech synth and not using any button. So the Speak and Spell will power off after few minutes.
We will need to add a "automatic button press" when a midi note is played to ensure the device does not power off. For example the "/" or "erase" on the keyboard don't do any sound ..  sounds the good key to use ..

First find the connection on beetween the CPU and the keyboard :
 Keyboard connector pin   ->  CPU pin
1   ->  2
2   ->  6             used for the "/" or erase key
3   ->  5
4   ->  33           used for the "/"or erase key 
5   ->  32
6   ->  Vbatt+
7   ->  31
8   ->  30
9   ->  34
10   ->  29
11   ->  28
12   ->  4
13   ->  3

Next step watch the signals ... on the Cpu pin 6 = nothing interesting.
on pin 33 .. a pulse of approx. 500 uS.

So will check if generating a pulse will do the job of if the pulse need to be correclty timed and triggered..



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