Hello,
I am working on modifying a sports-timer, that does nothing else than counting down from 30 to zero when I press start on the remote. However, it should countdown from a different interval.
It consists of a controller box, and a huge led matrix. The matrix is connected to the controller using a 4-wired cable.
Layout of the wires:
Pin 1) VCC (+32 Volts)
Pin 2) Data+ (5V)
Pin 3) Data- (5V)
Pin 4) GND
The Data- is the inverted signal of Data+. I am dead sure about this, as the microcontroller in the controller spits out this signal and it then goes to a RS485 transceiver.
The pins for the "returned" data are not used on this transceiver, so there is no communication back.
The problem is, that I need to reprogram a new microcontroller with some software that spits out the correct data protocol. In the attachments are some screen captures of the data lines using my logic analyzer.
In this capture, the counter is counting down from 30-25
Maybe some useful information:
Microcontroller of controllerbox is an Atmel TS87C52X2
Microcontroller of led matrix is a PIC16F627A (Yes, it does the multiplexing as well)
Photos of internals:
Thanks