I'm currently laying out my first real PCB (I've used perf-board for my projects up to this point) and I've been searching the forum (with little success) for information on good hardware design practices, specifically as it relates to PICAXE I/O pin protection. I'm sure this has been discussed "ad infinitum", but I guess I'm searching on the wrong keywords.
My project will connect:
PICAXE to PICAXE
PICAXE to parallel LCD module
PICAXE to membrane switch panel (common GND)
I know a current limiting resistor between the PICAXE chips is recommended but searching the web I find values from 100R to 100K. Typical value? Should I use the same for the LCD and membrane switch connections? Are they needed at all?
Thanks
My project will connect:
PICAXE to PICAXE
PICAXE to parallel LCD module
PICAXE to membrane switch panel (common GND)
I know a current limiting resistor between the PICAXE chips is recommended but searching the web I find values from 100R to 100K. Typical value? Should I use the same for the LCD and membrane switch connections? Are they needed at all?
Thanks