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The schematic I drew in the thread you linked to above used a PIC without all the extra interrupt inputs, so it has switches ORed to 2 interrupt pins.
The 16F690 you're using has IOC for all 3 of your switch inputs. So you could get rid of the diodes if you want to save parts & realestate on your board.
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That's what I thought you might be doin' (OR'ing active lo switch signals to trigger INT). As Bruce mentioned, using IOC might be a better option.
Is there some compelling reason you're using interrupts for the switches instead of just polling them at regular intervals?
Also, I re-read your original post and see where you said you don't have physical space for four switches so I apologize for not paying attention...
Last edited by Mike, K8LH; - 6th August 2010 at 20:41.
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