HiLetgo ESP-WROOM-32 ESP32 ESP-32S Development Board 2.4GHz Dual-Mode WiFi + Bluetooth Dual Cores Microcontroller Processor Integrated with Antenna RF AMP Filter AP STA for Arduino IDE

There are a number of ESP-32 dev boards, and I was completely new to these (last board I used was an Arduino AT-Mega 2650). I had tried to use an ESP8266 for my current project, but discovered there were not enough usable GPIO pins on the 8266 boards. I chose these HiLetgo boards for three reasons: (1) I had good experience with several HiLetgo modules in the past, (2) These are smaller than many of the other boards; as a result they can be used on a single breadboard and still expose a socket on each side, and (3) They have more Gnd and Vcc pins than some of the other boards. Upon receiving the boards (in 24 hours with Prime), I used instructions published by Random Nerd Tutorials (an excellent source of detailed information) to install these on my MacOS/Arduino 1.8.8 IDE. I had both modules up and running the demo software within 10 minutes, without any problem. They upload at full speed (921,600 Baud); I am told that many of the other boards will only do 115,200. The only slight inconvenience is that there are no pin labels on the top of the board (there was no room to print them, since the board is smaller than many of the others). They are labeled on the bottom, however, and accompanied by a large diagram of the pin-out from the top view. These have plenty of GPIO pins, and I am very satisfied with them so far. No struggles, mysteries, or obscure instructions, and no peculiarities or non-standard features. This appears to be a solid platform for our development.

This is a great ESP32 development board, and at a great price. I can’t believe the functionality available in these small scale, powerful computers. At first, I had difficulty finding the correct driver for a Windows PC. Once that was solved I’ve been able to conduct experiments with sensors and motors, using MicroPython. Geek Fun!

I purchased this HiLetgo ESP-WROOM-32 ESP32 Development Board for a custom haptics project, and overall, it performed really well. Setup with the Arduino IDE was smooth, and the onboard WiFi + Bluetooth functionality made it easy to handle both data transmission and peripheral control. The dual-core processor gave me the performance I needed for real-time feedback and signal processing. The board was reliable throughout development—no flaky connections, and it powered all my components without any issues. It's compact and affordable, making it a solid choice for prototyping. The only limitation I encountered was running out of storage space for my code. That’s more of a code management issue on my end, and I may need to refactor to optimize memory usage. Just a heads-up if your project has a large codebase or uses a lot of libraries. All in all, this board met my expectations and worked well for my needs. Would definitely consider using it again for similar projects! ⚠️ Disclaimer: This review is based on my personal experience and is provided for informational purposes only. I am not liable for how others use the product or interpret this review. Always test and evaluate hardware suitability for your specific application.

I've purchased one of the HiLetgo ESP-WROOM-32 ESP32 ESP-32S Development Boards. The board works great and it looks well built. I liked the readable schematics too. However, when I use an external 3.3V power supply to power the board, my code won't run. The 5V red led turns on and the IO2 blue led keeps blinking. When I disconnect the external power supply and use the USB cable, everything works fine. If you don't plan on using an external power, it seems to work fine. In my case, I may have to look for another manufacturer. I've submit a support request w/ HiLetgo and will update this review if there's a solution to this issue. Updated on 6/11/23 It turned out there was a cold solder joint on my own board (not HiLetgo's) that was causing the issue. I was able to identify the problem on my own but HiLetgo did respond to my inquiries. I'm changing the rating to 5 stars and will be buying more boards!

I've bought about a dozen of these now from HiLetgo and they all have been well made and reliable. This is the 38 pin version (beware, some variants have fewer pins- unless that's what you want). The board is just narrow enough to leave a row of sockets exposed on either side on a typical solderless protoboard. ESP32 offers a lot in a small package. With vendors price gouging for anything RaspberryPi and to a large extent most MCU/SBC boards during this time of chip shortages, the ESP32 remains reasonably priced. Only complaint is that HiLetgo uses a linear voltage regulator, which is not that efficient, so unless you can supply the board with stable, regulated 3.3v from an external source, you won't get the super low µA sleep currents that the ESP32 is capable of. Can't really fault HiLetgo on this, since it's really hard to find boards with high efficiency regulators. If you know what to look for and the product pictures are accurate, you easily spot the boards with the inefficient regulator (hint: it's the package with the 3 pins on the left and large pin/bar on the right- the third largest component on the board after the ESP32 and USB modules). I now see that HiLetgo sells the more efficient board for almost the same price (ASIN B077KJNVFP)- or look for WeMos/LoLin.

First, I am a total noob at this sort of thing. The board and the software all work fine once you puzzle it out. I decided to go with the platformio and JTAG debug method. This offers many hours of problem solving and googling just to get the blinky and hello-world examples to work reliably. I would take careful notes about a setup that seem to work then hours later I would get oodles of connection error messages/link errors/compile errors for what seemed like the same arrangement. Some items of interest: I assumed that I should see COM ports in order for this to work NOT SO. The debugger device fools you it does have a COM port but if you do it correctly it has some USB port instead BUT that only works on interface 0. You will become friends with ZADIG. Some pins are special at power on - surprise GPIO12 ! Although the JTAG debugger board has COM port it seems like it cannot be used while debugging or uploading ?? I had to use a separate USB - USART dongle so you need to USB cables. If you don't want to move little wires around. The slightest change to anything (with a few exception) causes 100s of little programs to be recompiled taking several minutes. Does the Win 10 Antivirus like that ? no way - it is going to slow that down for you. Trying to remove some of the fancy WIFI, BlueTooth, HTTP code just for a little testing seems near impossible. Careful with that platformio.ini else many hours of puzzlement.

Un micro Controlador muy Maleable para el espacio que ocupa y los 5V es muy eficiente en lectura de sensores muy eficiente...

I really wanted to like this board. I really did. Its a full $5-10 cheaper than other boards. But there's just so much wrong with it. Other reviewers have mentioned the obnoxious requirements that you have to press a button when flashing the board, and I'll reiterate how irritating that is. If you use something like ESPHome, which supports OTA updates, its SOMEWHAT mitigated, but not entirely, OTAs will sometimes just fail to apply, and you'll have to restart the board a few times and press the poorly labeled boot button (its labeled "100") My boards had issues with their I2C bus. I wired things up to the marked I2C pins, configured them in software, all to no avail. My I2C devices are working, I tested them with other boards and an oscilloscope, its just this thing refuses to cooperate. I didn't spend the time to see if they'd work on other, non I2C labeled pins, as I was just done with it and moved on to a board that I knew worked. Finally, there's the confusing pin-out labels. There are pin-out labels silkscreened onto the BOTTOM of the board, right next to where the headers normally face, so you can't see them when the board is installed into a socket, protoboard, breadboard, or the like. You'll probably spend a lot of time consulting the pin printout they include in each package, which is also confusing. It doesn't say GPIO, it says GIOP. And the other, ancillary labels, are weird too. You can generally decipher what they're saying, but you'll always be second guessing yourself. Don't waste your time with this board, just go with a slightly more expensive board from a known manufacturer, like Adafruit or Espressif themselves.

Received item is not what is on pictures, it should have 18 pins I got only 15, I found items similar or identical to this on a chinses site for 2 euro. On top of this it seems it's not working. Looks like a typical scam, when people resell items from Chinese sites here for 10 times of a price.

Acheté pour tester afin de réaliser une "station météo" avec de multiple capteurs (afin d'en avoir dans chaque pièce de la maison et à l’extérieur). Ce module rend la fabrication d'objets connectés relativement facile grâce à l'IDE arduino et tout son ecosysteme. J'ai pu réaliser une version brute de ce que je cherche à faire en moins d'un après midi, malgré aucune expérience au préalable avec l'ESP32, en utilisant des librairies préécrites et un peu de logique. Cela permet d'imaginer une multitude de projets connectés pour les futures journées pluvieuses ;)

Works well with arduino iot platform. Blynk does not support this board.

Good quality controller. Works just perfectly.

Board works fine, though as some others have found, I needed to hold IO0 switch to upload from Arduino IDE. This can be solved by adding a 1uF capacitor from EN to GND. The details can be found if you search for "ESP32 Reset To Bootloader Issues on Windows."