Arduino to RPi: three ways to convert 5 volts to 3.3 volts

There is a problem when connecting an Arduino to the GPIO on a RaspberryPi. The logic level on the Arduino is five volts and the RaspBerryPi requires 3.3 volts. Sending a five volt signal to a GPIO pin will damage the RaspberryPi. When I wire something wrong I want to a see spectacular blow-up. You …

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