Review on 📶 KeeYees 2 Pack ESP32 Mini WiFi + Bluetooth Development Module Expansion Board Chip ESP-WROOM-32 for NodeMCU and Arduino - Upgraded for Internet Connectivity by Russell Mahendra

The circuit board is of high-quality workmanship and looks high-quality. For example, the circuit board is clearly marked and the solder joints are clean. The serial port works well and maintains maximum speed. The board has two pins, which makes it not compatible with a breadboard. Since the board comes with short headers, you can solder them on and then put jumpers in the headers. That makes it very useful. I prefer a board that I can plug into a breadboard as I develop, but everyone has different needs, so offering a board with this pinout is good. The problem with this board is that the power regulator is too small. It has a maximum output of 150mA, and the microcontroller exceeds this when using Wi-Fi. I checked this by running an HTTP server on the board most of the time. I couldn't get a response from the server, but when I did, the board rebooted. When restarting, the serial interface displays the message "Undervoltage Detector Triggered". This error indicates that the voltage applied to the board was too low, requiring the board to be reset. The reason for the voltage drop is that the board draws more current from the regulator than the regulator can handle. Most ESP32 boards use the ASM1117 regulator, which can handle up to 1A. I guess this choice of controller was a cost saving measure, if so it was a bad decision.