In this video, we'll use an EEPROM (28C16) to create a decimal display for an 8-bit value. The display uses multiplexing to drive four digits using a single EEPROM. As a bonus it supports both unsigned and signed (twos complement) display modes.
Support me on Patreon: https://www.patreon.com/beneater
The code used in this video for programming the EEPROM is available here: https://github.com/beneater/eeprom-programmer/blob/master/multiplexed-display.ino
See https://eater.net/bbcpu8-output-register for more info.
Parts list for the finished decimal display:
- 1x 28C16 EEPROM
- 1x 555 timer IC
- 1x 74LS76 (Dual JK flip-flop)
- 1x 74LS139 (Dual 2-line to 4-line decoder)
- 4x Common cathode 7-segment displays
- 1x 1k resistor
- 1x 100k resistor
- 2x 10nF capacitors