![]() Transistor (middle) = ON ![]() (Drag the GPIO Voltage slider on the right from on to off)Īs you can see from above, the following is happening when 3.3V is switched between ON and OFF. To get a better idea of how this circuit works, you can play with it here. I ended up using 2 Transistors, because I wanted the initial state of my circuit to be OFF (this is shown in the gif below) I went ahead and labeled all the major components to help other beginners out there :) Here's the final circuit that worked for me: So instead, we can address the issue by introducing an NPN transistor to operate at the lower 3.3V, and leverage the 24V current to trigger the MOSFET gate instead. Even though the data sheet says it only needs 2V, it actually works best with 5V. The MOSFET I'm using doesn't fully turn with 3.3V applied to the GATE. Here's an answer based on my basic understanding of MOSFETs and learnings building this circuit. So my main question, is there a way to build a circuit where the solenoid is OFF by default, and only triggered ON quickly when a 3.3v GPIO signal is detected?Īlso, is using a MOSFET an ideal solution for using the GPIO on the Raspberry Pi, or is there a simpler way I could be turning my 24v Solenoid on and off using Raspberry Pi? As a beginner, I can't seem to find a simple, straight-forward answer to toggling a solenoid using 3v3 GPIO pins! To keep the solenoid off with Mike's circuit, I need the GPIO set to HIGH, which causes the 12v current to run through the NPN transistor, heating it up a lot. When the Raspberry Pi is on and outputting the 3.3v from the GPIO, then the NPN transistor heats up a lot. Is there a way to prevent this? Ideally when Raspberry Pi 3.3v is ON, then the solenoid gets triggered. I'm assuming this is because there's no current coming from the GPIO pinout to pull the MOSFET gate to off. When the Raspberry Pi is turned completely off, the 24V solenoid gets switched ON causing it to heat up (not ideal that it would stay on). Gikfun RFP30N06LE 30A 60V N-Channel Mosfet TO-220 ESD.This is the circuit I'm currently using that works using the following parts: I had someone else outline a circuit that I could use using the 3v3 GPIO output to toggle the MOSFET. I'm a complete beginner attempting to build a basic circuit using a MOSFET to trigger a 24V push-pull solenoid from a Raspberry Pi's 3v3 GPIO pin.
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