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Safety critical RF remote control protocol?

Discussion in 'Electronic Repair' started by N_Cook, Oct 5, 2012.

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  1. N_Cook

    N_Cook Guest

    Coupled remote control with main unit. Both ends are transmit and receive
    using Nordic semiconductor nRF905 tx/rx chip sets.
    The synchro routine seems to work , requiring 2 way link both ways, to
    synchronous codings between both units. But whatever button is pressed ,
    opens up the serial data line on the main unit , but non varying with
    whatever button is pushed.
    Uses Atmel ATMEGA68 uC on the hand unit and 2 x ATMEGA168 on the main unit .
    One probably for synchro and decoding functions and the other for opening
    out/monitoring to/from the controlled operations. Otherwise uses 4066 and
    ULN2003A to buffer out to relays and powerfets for pulsing/speed control. So
    pinouts available for all ICs involved
    Is the failure likely in the decoding / fanning-out operation or some
    feedback monitoring signal not getting to the main unit Tx as
    How to narrow down to which, no schematic available, and thick conformal
    coating over SM does not help
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