![]() ![]() Additionally, if the 3.3V device’s high output signal has a lower voltage than the lower limits of the input high lower limit, then it is possible that the input will not register the high logic level at its input. While the inputs of Arduino Uno and other 5V devices (see Table 1) can work with 3.3V devices, you might run into some issues with high-speed devices. If you are interested in what the input port protection looks like, you can check “I/O Pin Equivalent Schematic” in “I/O Ports” section in ATmega328P datasheet here. One interesting thing to note is that the absolute maximum input voltage is actually 5V+0.5V due to the input protection diodes. The voltage that you can input or output from any pin on the Arduino Uno is 5V. What are the max voltage ratings of individual pins on my board?Īs we said in the beginning, the pins on the Arduino Uno can output 5V in an either on or pulse width modulation state. ![]() Do these ratings change with different supply voltages?.What are the max voltage ratings of individual pins on my board?.
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