The ESP-Link is a clever project, which turns an ESP8266 WiFi module into a transparent serial link - sort of a wireless FTDI interface. Thorsten not only created a really powerful software package for this, he also built a few prototypes to turn this into a small “BUB-like” package:
Here’s the schematic of what’s on this board:
An ESP8266 and a switching regulator to bring the 5V down to 3.3V, basically.
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