HiLetgo ESP WROOM 32 Bluetooth Development Display Review

Have you ever programmed an IoT device to crash when disconnected from the computer? The built-in display is a great way to show bootup messages like "connecting to Wi-Fi", "hibernation", "lost IP address", etc. And once booted up, the display is a great way to view small information bar. Check out my video - the screen is big enough for 4 stats. Lots of good uses for it!

This little beauty is perfect for connecting to a server via WiFi to transmit sensor data or emulate a BT controller on something like a FireTV. I think the display strikes a good balance between having enough space to display a few crisp lines of text and being easy on the battery for the first 30 minutes of use. I'm still amazed that at this price you can get a microcomputer that allows you to use the espressif toolkit to put decent sized binaries into such a small package. No joke, you have…

This is my 10th esp32 and my 6th with OLED built in. All previous ones with built-in OLED had difficulties with OLED operation. They have made several important improvements to the esp32 and esp32 with OLED displays libraries in the Arduino IDE. My first took a few hours driver and all. I installed this in 10 minutes on a brand new computer that didn't even have the Arduino IDE installed. If you need help there is a very helpful website that starts with "Nerd". I've had great success with OLED…

This is a great development board for any project that requires a display. No additional ports are required other than USB for power. It would be great to show the local weather, the time until the next bus or train, or the status of other smart home sensors. First, install ESP32 support in the Arduino IDE and download the ThingPulse/esp8266-oled-ssd1306 library from GitHub. It includes some examples to get you started (attached photos from this example code). I'm really excited to play more…

Great board! One caveat: the board doesn't have an "auto-reset" circuit for flashing firmware/uploading sketches, but load MicroPython once and you can use the "ampy" tool to run scripts without rebooting! I just made a simple sketch for a game I play, just shows my "Energy, Nerves, Happiness, Life" on OLED (see screenshot), works the same as any other OLED SSD1306. Personally, I prefer white OLEDs over blue from other brands. (usually blue)

The OLED display was crooked - slightly crooked. Turns out the issue wasn't just that it was glued that way, but that the wires were soldered to the board at a slight angle, so not easy to fix. Not a big problem - still works - but now I'm going to be 3D printing a case for it and not only have to worry about whether it looks or fits right, I also have to wonder how exactly other boards I buy fit the body be able. Also, this OLED display doesn't appear to have any libraries for Espressif IDF…

This little beauty is perfect for connecting to a server via WiFi to transmit sensor data or a BT to emulate controllers. on something like FireTV. I think the display strikes a good balance between enough space to display a few crisp lines of text and not draining the battery for the first 30 minutes of use. I'm still amazed that at this price point you can get a microcomputer that will drive the espressif toolkit to cram decently sized binaries into such a small package. No joke, you have…

Five minutes to the Internet of Things! This board is very easy to use with the Arduino IDE. in Tools->Board->Board Manager and type "ESP32" in the search bar3) Select "WEMOS LOLIN32" from Tools->Board. Make sure you have the right COM port. 4) Select the sketch from File->Examples and upload it to the board. I used "SimpleTime" which connects to your wifi (enter the SSID and password on lines 4 and 5 of the sketch) and gets the current time via NTP. Then this time it will be…

This board is great. unless you actually want to connect the pins to something. I thought the built-in display would be a nice convenience, but got hours of pain instead. It comes without instructions. The HiLetgo website currently doesn't even load (I get an HTML that partially loads without CSS). Okay I'm ok with a simple pinout. First I tried to connect the sensor to the GPIO pin and suddenly I got errors when trying to flash the device. Tried pins 5 and 4, all lit up fine except those…