At the core, it’s nothing more than the ESP board, an ArduCAM camera module, and a momentary button ... There are firmware versions for both the ESP8266 and ESP32, so fans of either generation ...

The latest solution comes courtesy of [Keilin Bickar], who’s using the ESP8266 and a serial TTL camera module to read the characters from the LCD of his water meter. With a 3D printed enclosure ...