So in this tutorial, you will learn how to use uln2003 with Arduino to control a relay, an led “light-emitting diode”, A solenoid Valve, etc. But what if uln2003 was used in this circuit? So we can reduce the PCB size, we can reduce its making time, we can reduce its price. If you look at this circuit, this circuit consists of 7 relays, seven transistors, seven diodes, seven resistors, a lot of soldering, needs more space, difficult troubleshooting, which results in an increased price. So far, I have been using 2n2222 NPN transistors, resistors, and diodes for controlling the relays. At the same time, you can control 7 relays. One of its most common uses is that uln2003 is used as a relay driver. ![]() ![]() ![]() Arduino ULN2003– Today’s Tutorial is about the ULN2003A, which is most commonly used in electronics circuits.
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