Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hi, I need an input pin to detect 12/24v but i'm trying to keep parts to a min. If i fed that straight in would it be ok or should I use a zener regulator or a transistor switch and enable WPU on that port? Thanks....
Ensure the pin you're using has a protection diode, and then just use a resistor to feed the pin - choose the resistor to only supply something like 1mA or less. 10K for 12V or 22K for 24V should be fine.
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