arni_jamal
Newbie level 5
hello everybody.. i've got a problem here where i can't see the display on my led matrix..
i'm doing a counter and using the led matrix as a display. i've writing a program using assembly languange.
i also checking the voltage between each ic and each output.. the voltage showed around 4~5V but the led matrix still don't light on..
i hope u people will help me troubleshooting my project.. i cant identify the problem..
electronic component i use:
pic16f84a
multiplexer 74LS154 (4-to-16 bit)
transistor 2n222
two 8x8 led matrix (but use only 5x7)
limit switch for input at port 7 (pin 13)
reset switch for reset at MCLR (pin 4)
i'm doing a counter and using the led matrix as a display. i've writing a program using assembly languange.
i also checking the voltage between each ic and each output.. the voltage showed around 4~5V but the led matrix still don't light on..
i hope u people will help me troubleshooting my project.. i cant identify the problem..
electronic component i use:
pic16f84a
multiplexer 74LS154 (4-to-16 bit)
transistor 2n222
two 8x8 led matrix (but use only 5x7)
limit switch for input at port 7 (pin 13)
reset switch for reset at MCLR (pin 4)