This is a Protection for Input Ports Arduino Circuit Diagram. During tests or doing some project, we run the risk of accidentally burn Arduino input. A short circuit protection can prevent a lot of problems and is one less worry, especially against accidents. It is simple, you just need a 1k resistor and a zener diode of 5 Volts, which in the case of commercial zener diode, the voltage is closer to 5.1 V and diode is the 5V1.
Protection for Input Ports Arduino Circuit Diagram
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