What am I doing wrong if current flows through the PN2222A transistor even when digitalWrite is set to LOW? There is a 1000 Ohm resistor connected before the Base. There is no external power source, only the Arduino 5V. [kép_2024-06-21_133242969] In the picture, the bottom resistor would be the u…

Install same 1000 ohm resistor PN2222 base to GND. That should shut it off. LOW is not zero volts.

The collector is not connected to anything. A0 is connected to 5V. What were you expecting to see? [8b0] Please post you code using code tags<CODE>. It's currently unreadable.

You should give this a quick read [image] How to get the best out of this forum IDE 1.x See also FAQ - Arduino Forum for general rules on forum behavior and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please…

Control of PN2221A transistor

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jim-p June 21, 2024, 12:08pm 4

You should give this a quick read

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Control of PN2221A transistor

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