RE: Custom 28 Relay Controller Board for Raspberry Pi 3

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When powering on/off the Pi the GPIO pins 2, 3, 14 change state temporary... switching on and off the relays on them.

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OIC, the only solution for that is to invert the signal at the hardware level. Such an inverter can simply be built with a single transistor and two resistors, or you can use a chip with six of them, like a 74HC04 (powered with 3,3V).

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ঈত

it is too much costly here in Bangladesh!!

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