Hey everyone! I want to start a new small project and have quite some questions due to ignorance and incompetence with which I hope you could help me out! I already did a few small LED lighting projects with Arduinos, but I am still quite new to everything, I think. Therefore any advice is very much appreciated :-) I would like to use a DF Robot Beetle ESP32-C6 Mini (https://www.dfrobot.com/product-2778.html) to control a white 5V LED stripe (like this one: https://amzn.eu/d/fjpVlmg) via Zigbee, so that I can integrate it into my Home Assistant (Zigbee2MQTT). The LED stripe and all the needed electronics will be put behind a simple mirror in my bathroom, so everything needs to be very compact. The gap between the mirror and the wall is only around 7 mm (0.275 inches). The mirror is quite large, so rear surface area is plenty. Furthermore I would like to power the Beetle ESP32-C6 Mini and the LED stripe with a single USB-C cable, that will be running from a close-by usb plug to the mirror. So much for the introduction. Here are my questions / problems: 1) The Beetle ESP32-C6 Mini does not seem to have a 5V power out. So do you have an idea how I could practically fork the 5V power from the Beetle ESP32-C6 Mini's USB-C socket to the LED strip? I will only use some small pieces of the LED stripe, because the light should be quite dim, since it will only be used at night. As a result very few power will be needed. 2) Regarding the PWM dimming of the LED strip: I still have some IRL 3705N MOSFETs (https://www.infineon.com/cms/de/product/power/mosfet/n-channel/irl3705n/) lying around from my past projects. Back then I used them for dimming some white 12V LED strips. The PWM signal came from an Arduino UNO, which means that it was 5V. Now my question: do you think these MOSFETs would also work fine with the 3.3V PWM signal of the Beetle ESP32-C6 Mini and the 5V LED stripe? If not, do you have recommendations for a better fitting MOSFET? 3) Since it's been a while since I last built a PWM dimming circuit: do I need any further electronic components than one high-ohmic resistor (like 10k) at the gate of the MOSFET? That should be all for now. Many thanks in advance for your support!!
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Edited by User
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According to the schematic P4 pin 3 (VIN) is connected to VBUS. The MOSFET should work, but it is less then optimal due to the gate threshold voltage and high gate capacitance. Depending on the switching frequency there will be some switching losses, but nothing to worry about. Just give it a try. Depending on the current, a FDN339AN could be used for currents <1A and voltages <20V. It will switch faster but also generate more noise.
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