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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
    confirmation/handshaking?
    How to narrow down to which, no schematic available, and thick conformal
    coating over SM does not help
     
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