Programming anESP-01(or any other ESP8266 variant) can be a bit tricky, starting with a significant amount of wiring, and finishing with a button-mashing challenge to get it to boot into the correct mode. This handy little programmer makes the process of getting your code into the ESP8266 onboard the ESP-01 much easier. Simply plug the module into the 2×4 header, set the switch to "PROG" and you're ready to load your code.
As you may have heard, theESP8266 Serial-to-WiFi chipcreated by Espressif has seen a wide adoption as a cost-effective solution for IoT and WiFi-capable devices. This tiny-sized System On a Chip (SoC) includes an 80 MHz microcontroller with a full WiFi front-end (both as client and access point) as well as a full TCP/IP stack with DNS.
Because the ESP8266 comes only in a tiny surface-mount package (QFN-32), a few different vendors have developed a series of modules named ESP-NN where NN are numbers ranging from 01 to 13. TheESP8266 ESP-01listing is the 'OG' of this series of modules, and provides a nice little breakout for some of the pins of the ESP8266 IC.
You'll definitely want one of these if you've ever had to breadboard a quicky-programmer adapter for these more than once!
Interface: USB-A connector plugs right into your PC's USB port