Detecting ignition on/off through GPIO in a 12V automotive scenario. What is the preferred way to drive the input, protecting it from getting fried by electrical disturbances at a budget?
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‎2022-05-16 1:09 PM
Will a voltage divider and a Zener diode pretty much suffice or will galvanic separation be necessary? Does anyone know/have an out-of-the-box solution?
Thanks,
Mike
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‎2022-05-17 12:38 AM
Single 220 kOhm series resistor should be enough.
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‎2022-05-17 12:53 AM
https://www.sunrom.com/p/tvs-diode-12v-bidirectional-smbj12ca-smb
check out TVS (Transient voltage supressor) diodes .
in automotive scenarios i always protect against 120V spikes from the battery (they do happen specially at motor startup/stall)
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‎2022-05-18 5:21 AM
*automotive scenario*
