Hello,
I found this forum while I was trying to find an answer to this question and i thought I would give it a shot. I have a scoreboard without any kind of controller to input scores, so it is worthless unless I modify it. I have opened it up, it has a suitable power supply and circuitry to control the digits. It uses a 4511 to convert BCD to the seven segment display logic (which is hooked to transisters and then to the display itself). I have expirence programming the PIC16F684, and from that standpoint this looks like cake. So basically all I need to do is to cut the trace to the chips and hook up a pic to output bcd and the latch signal (2 4511 chips and displays for each PIC). My only issue is interfacing the PIC to the two 4511. I think what I need to do is hook 4 IO from the pic to the ABCD inputs of both 4511 and 2 more IO to each of the latch inputs. In my mind it seems easy, but when I look at the circuitry that already exists to control the chips it seems alot more complicated. Do I need to put resistors between my pic IO and the 4511 or something? How about resistors from the IO to +5v? these things seem to be in place for the old circuitry.
I found this forum while I was trying to find an answer to this question and i thought I would give it a shot. I have a scoreboard without any kind of controller to input scores, so it is worthless unless I modify it. I have opened it up, it has a suitable power supply and circuitry to control the digits. It uses a 4511 to convert BCD to the seven segment display logic (which is hooked to transisters and then to the display itself). I have expirence programming the PIC16F684, and from that standpoint this looks like cake. So basically all I need to do is to cut the trace to the chips and hook up a pic to output bcd and the latch signal (2 4511 chips and displays for each PIC). My only issue is interfacing the PIC to the two 4511. I think what I need to do is hook 4 IO from the pic to the ABCD inputs of both 4511 and 2 more IO to each of the latch inputs. In my mind it seems easy, but when I look at the circuitry that already exists to control the chips it seems alot more complicated. Do I need to put resistors between my pic IO and the 4511 or something? How about resistors from the IO to +5v? these things seem to be in place for the old circuitry.