Home › Forums › Microcontrollers › PIC Microcontroller › 18F4550 with 74LS138 › Reply To: 18F4550 with 74LS138 June 20, 2015 at 9:41 am #11507 ericJParticipant I used the program in the tutorials on the 4×4 keypad as an example I modified it to scan the rows using the 74LS138 but I can not get it to work properly. I attached the I used. Please let me know what I am doing wrong.
