WEMOS LOLIN32 Lite
Please note - this product has been retired:
The current models can be found here.
The LOLIN32 Lite is a low-budget ESP32 board that, like other ESP32 boards, has a 32-bit dual core microcontroller that runs at 240MHz, has 4MB of flash storage, and can be programmed in a range of languages, including microPython, LUA, and Arduino. It can be powered via micro USB or lithium polymer batteries with a 500mA max charging current. A set of matching headers are included, that can be soldered to the board, for mounting on a breadboard.
By default, the firmware that comes with this board accepts AT commands.
A schematic is located here.
MacOS and Windows drivers can be found here. Linux will detect the board out of the box.
You can download the micro Python firmware under 'Firmware for ESP32 boards' here. This can be installed on your LOLIN32 Lite using the Python esptool, which is available here. If you're just getting started, we recommend enabling on the device, and downloading the WebREPL web interface to upload edited files. You can also use Adafruit's commandline tool, ampy.
- Hardware version: 1.0.0
- Operating voltage: 3.3v
- Digital I/O pins: 19
- Size: 50mm x 25.4mm
- Weight: 4g
After my years of using ATTiny chips for model train block detection, all working well until the next stage of reporting to the MAIN controller, it all fell in a heap. Needs too much tech to lift the signal over distance, too slow, lost messages etc.
Then came along the ESP###, and to this next generation, the Wemos ESP32 Lite, WIFI 4Meg of memory, 3.3V, comparable IO, Bluetooth and BLE (Bluetooth lite), and LIPO connection to boot and comes with your choice of programming with MicroPython LUA or Arduino.
Fantastic, runs its own code making on the spot decisions, communicate by cobbling with MQTT and Node-RED running on a Raspberry Pi (https://smalldevices.com.au/collections/cases/products/raspberry-pi-3b-starter-kit) , couldn't get better than this. Node-Red gives me browser based switches, alarms sounds, speed and other gauges, all works seemingly.
Bought a second unit to pressure test the MQTT, not a problem, simulated 60 messages a minute, ran for 8 hours straight without a hitch.
My interest is running trains but these things can do anything. I walk into my playroom, lights come on automatically, Wemos says hello, model railway lights come on. What a great experience.
Get one and start the fun.