Simple logic LED tester
a module consisting of 4 LEDs as output and 4 pieces of tactile switches as input. This module can be used as logic tester for input and output of the microcontroller port.
specifications:
- 4 LED configuration with active low (logic 0 on a port will activate LED).
- 4 tactile switches with active low configuration (tactile switch is pressed will produce a logic 0).
- Can be used on the port PPI (82C55) and port 1 MCS-51 microcontroller.