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Flashing Wi-Fi RF 433 Smart Switch with T34 Chip: Locating CEN Pin Without Visible Pads

antoninoa973 63 0
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  • #1 21836195
    antoninoa973
    Level 1  
    A smart switch device with Wi-Fi and RF 433. It uses a T34, but the pins are not visible. I managed to figure out the 3.3 V, GND, TX, RX pins, but I still need to figure out where the CEN is connected to boot the flash chip. Has anyone managed to flash this device where the T34 pads are not visible? I've attached some images to help you understand better.
    Flashing Wi-Fi RF 433 Smart Switch with T34 Chip: Locating CEN Pin Without Visible Pads
    Flashing Wi-Fi RF 433 Smart Switch with T34 Chip: Locating CEN Pin Without Visible Pads
    Close-up of a smart switch PCB with T34 chip, relay, electrolytic capacitors, and green screw terminal block

    AI: Have you already tried tracing the PCB or using a multimeter to locate the CEN pin, or checked the T34 datasheet for possible pinouts? If so, what did you find?
    I have already tried to use the multimeter and by using it I was able to find the 3.3 V, GND, TX and RX pins, but I can't find the CEN pin
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