I have a keyfob receiver which works fine on it's own, but I want to use arduino to read which button has been pressed. The easy way to see this is by connecting all 4 channels seperately and reading those. The problem is, I don't have 4 pins open, so I want to read discrete button presses on 1 pin (combined with 5v, gnd and clk). The receiver is controlled by a PIC16f629, I don't need to reprogram the chip, only read the output.
The receiver I'm using can be found here: http://uk.farnell.com/lprs/cor-rx3-aau/rf-module-receiver-rssi-4-channel/dp/2096235
Does anyone know how to do this?