HiLetgo 10pcs 4 Channels IIC I2C Logic Level Converter Bi-Directional 3.3V-5V Shifter Module for Arduino

Worked flawlessly as described. Used it to step down 5 V encoders to 3.3 V to read into Raspberry Pi Pico 2.

I was worried about them being cheap knock offs but they all worked as intended.

I've attached a simple schematic showing one channel of one of these boards. Each board contains four identical circuits using BSS138 MOSFETs. The ground pins are not connected to the circuit in any way and are not needed for it to function, a low level output is sinked through the corresponding input signal (MCU GPIO pin). A high level output is sourced through the corresponding Vin pin (LV or HV) through a 10k resistor. These have been working well in my experiments so far. I have one using two channels for I2C and two channels driving 5v logic-level power MOSFETS from a 3.3v microcontroller. Note that if an input is left floating, the corresponding output will go high. If using unidirectionally you can put a strong pull down resistor (1k) on the input side. A pull down on the output side will cause malfunction.

I’m using an ESP32 to drive roughly 10ft (3 meters) strips of full-color addressable LEDs. The ESP puts out data at 3.3v, and the LESs use 5v logic, so this chip sits between. I’ve read this chip is technically not fast enough for this protocol (I2C?), but in practice this will allow an ESP32 running WLED to drive ~800 LEDs on two physical strips w/two meter leads between the ESP and the strip start. IC’s arn’t easy to install or intuitive to use, but compared to the smaller packages, this is doable for a hobbyest.

If you're working on projects with Arduino or any other small board, you'll find that you need to use a voltage shifter like this from time to time. I've only used a couple of these but when you need them they're very handy to have. The only thing about these is that there are 4 channels on each board and I have yet to use more than 2. But, at this price, it's more about the size of the board and the space it takes up than the cost of a 4-channel vs 2-channel LLC. As stated in the description - these are two-way. It can take a 3.3v supply up to 5v and can take a 5v supply down to 3.3v.If you don't mind doing the soldering yourself these are great. I typically won't solder the headers onto the boards and just directly solder wire to the terminals I'm going to use. True it's a more permanent solution but considering the low cost of these, the reduction in height by not using the pin headers, and my ability to brush up on my fine soldering skills, i'm very happy to use them this way.

I've only used these to shift from 3.3v to 5v, and not used the bi-directional feature, but it does exactly what it says for my purposes. They are fairly easy to assemble for anyone with a beginner level of soldering, and a breadboard to hold the pins straight. Be sure to provide a clean 3.3v on the LV pin, a clean 5v on the HV pin, and a shared ground with the rest of the circuit. The rest will depend on your data input/output requirements, but again provide clean power, and check for voltage drops if you experience issues.

Using a number of these in my jeep in a circuit to read , oil pressure, water temp and fuel level with an esp32. Seem good so far.

I spent a large amount of time trying to get these to work.For my setup I was trying to shift from a ESP32 with 3.3v logic to a 5v PWM controller which uses MOSFETS to control 4 different outputs. I tried pretty much every imaginable combination of inputs and outputs but was never able to get the 3.3v logic to convert to 5v. The logic level converter worked with the ESP32 plugged and the mosfet control board unplugged but as soon as I plugged the mosfet board in the voltage dropped to 3.3v on the higher voltage output side.As a note I was using 2 buck converters to percisely control the low voltage and high voltage sides of each board to 3.3v and 5v but even with this they did not convert correctly. I tried 4 out of the 10 board but none worked and I gave up after that.If you buy these be warned they may not work for this kind of an application.