mouzid
Full Member level 5
current sinking and sourcing
Hi edaboarders,
I do not really understand how to use the ULN2003a for my dot matrix project. The matrix led that I have is common anode, I connect the PORT B of my PIC to the ULN2003. The output of the ULN goes to the row of the matrix, the PIN 9, of the ULN is connected to +5V and the PIN 8 to GND.
Unfortunately leds seems to be not receiving power supply and I see no leds blinking. I used another ULN but the problem persisted.
What's wrong with my circuits ?
Do you know a better circuit that the ULN to source current to led ?
Thanks in advance for you replies.
Hi edaboarders,
I do not really understand how to use the ULN2003a for my dot matrix project. The matrix led that I have is common anode, I connect the PORT B of my PIC to the ULN2003. The output of the ULN goes to the row of the matrix, the PIN 9, of the ULN is connected to +5V and the PIN 8 to GND.
Unfortunately leds seems to be not receiving power supply and I see no leds blinking. I used another ULN but the problem persisted.
What's wrong with my circuits ?
Do you know a better circuit that the ULN to source current to led ?
Thanks in advance for you replies.