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Posts: 1,104 | Thanked: 5,652 times | Joined on Feb 2010 @ Holland
#107
Okay... Good and bad news.

My keyboard pcb performs as planned! The i2c i/o expander does not. It has a lot of trouble staying connected to my RPi, which makes it impossible for any communication between the two.

However, I am very interested in the chip onethreealpha suggested. And after having a crack at it and looking around on the internet, I decided future prototype-pcb's will be outsourced!

Edit: the more I learn about this whole I2C, the more I come to realize they MUST include an interrupt line. Polling for every single OH would make it useless. Polling for OH with camera shutter? Forget it! If the TCA8424 works with MER and de Mallit-keyboard, I say we go for it!

Last edited by dirkvl; 2013-10-13 at 08:39.
 

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