App note: Four channel digital voltmeter with display and keyboard

ap_4_channel_dvoltmeter_w_disp_key

Here’s an old but quite clever approach app note from Microchip on utilizing microcontroller I/O’s to handle multiple display and switches with only few pins.

This application note demonstrates the capability of the PIC16C71 and has been broken down into four subsections:
• Multiplexing Four 7-Segment LED Displays
• Multiplexing Four 7-Segment LED Displays and Scanning a 4×4 Keypad
• Multiplexing Four 7-Segment LED Displays and the A/D Channel 0
• Multiplexing Four 7-Segment LED Displays with a 4×4 Keypad and 4 A/D Channels

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