KIT181 uses the same TX/RX pair as KIT180 but it uses all 10 defined keypress combinations out of the 4 buttons to activate relays. If you read the technical documentation the following keypress combinations give readable outputs: pins 1, 2, 3, and 4 (of course) and the pins 1&2, 1&3, 1&4, 2&3, 2&4, and 3&4 pressed together. A PIC16F628 does ALL the work. It is a perfect demonstration of how micro-controllers have taken over from CMOS logic etc. Toggle or momentary mode will be determined by keeping the 1 or two buttons depressed for more than 2 seconds and then that relay will stay in that mode until another >2 sec keypress. Small relays are used to save weight and board area. Get the commented source code and object hex file.
The product datasheet is available here to view
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