Killing an Arduino and I2C device with a relay? – electronics.stackexchange.com

Killing an Arduino and I2C device with a relay? – electronics.stackexchange.com

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I destroyed* an 5V 16Mhz Arduino Pro Mini and a PCF8574 I2C port extender and I wonder how. Obviously it can be many things (ESD, overvoltage, etc.). But I suspect the problem lies in my driving a 24V ...

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