jit_singh_tara
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What would be the best method for scanning 40 keys using pic microcontroller :
1.interrupt based using multiple port expanders mcp23017 or mcp23s17.
2.Using a dedicated controller for key scanning and sending data using rs232 tx pin.
3.Any other method.
1.interrupt based using multiple port expanders mcp23017 or mcp23s17.
2.Using a dedicated controller for key scanning and sending data using rs232 tx pin.
3.Any other method.