This is a breadboard adapter for the popular ESP-01 model of the ESP8266 serial-to-WiFi transceiver module.
ESP8266 is an inexpensive Serial-to-WiFi tranceiver chip that can connect any microcontroller with a serial port to a WiFi network. Because of its simplicity and low cost, it is getting popular among hobbyists for building Internet of Things (IoT) applications.
Out of many breakout boards available for ESP8266, ESP-01 model is the most popular one among hobbyists because it provides access to the power supply and I/O pins through a 2×4 (0.1” pitch) male header. Drawbacks of this module are that the pin arrangements are not breadboard friendly and are not labeled, which makes it little inconvenient for rapid prototyping. So, we designed this breadboard adapter to make prototyping with the ESP-01 module easier.
The adapter has a 2×4 female header to receive the ESP-01 module and provides easy access to those pins through two single row male headers (with clear pin names printed next to them) that are breadboard friendly. An additional power supply filter capacitor of 10uF is also provided on board.