These are standard ESP8266 ESP01 WiFi modules as shown on the Espruino ESP8266 page. Add WiFi to your Espruino with just 5 wires!
ESP01 can be connected directly to:
Other boards such as the Espruino Original and Pixl.js do not contain powerful enough 3.3v voltage regulators to reliably power the ESP01, so while it can be added you'll need a separate 3.3v voltage regulator. Puck.js does not contain a voltage regulator at all so could only be used with an external 3.3v supply.
These modules have 0.40 firmware - the AT+GMR command reports:
AT version:0.40.0.0(Aug 8 2015 14:45:58)
Ai-Thinker Technology Co.,Ltd.
Build:22.214.171.124 Sep 11 2015 11:48:04
ESP8266 ESP01 WiFi module
- Product Code: ESP8266-ESP01
- Availability: 12
- Ex Tax: £4.99