2PCS USB to ESP8266 Breakout CH340C ESP-01 ESP-01S Prog WiFi Programmer Downloader Adapter with Reset Auto-Download Circuit

This module (ESP8266 ESP-01S WiFi Serial Transceiver Module), was flashed using the Lerdge method and bin files, for use with their "K" board. Worked perfectly. I only used 1 out of the 5 that I received, but my guess is that the rest will work for other projects as well. I wanted to have backups for the printer, but I might try them using an Arduino. Packed well with good service and shipping.

Love this thing!!! Makes a QUICK job of flashing and testing MCU chips! No more juggling clips, wires and chip to connect up for flashing/testing, not sure if one or more are correctly connected. Just press the chip into the fixture, ALL GPIO's, VCC, GND, etc are firmly attached, EASY to address any contact point with .025 square pin-outs as a bonus! It even has a female cluster for quick attachment of small development boards. With a USB micro to supply data/power, LED lights to confirm communication and power plus buttons for reset and reboot. All mounted on a thick plexiglass base with all contact points labeled. Although I've only run 15 chips through this fixture, I have saved HOURS of setup and REPEAT testing/flashing time! Well worth the money! (fair price also)

I’ve tried multiple and always thought I was doing something wrong cause none worked. But this one worked first time right out of the box.I’m not going back. Highly recommend it

Can flash maybe 100x and then it refuses to flash and keeps giving an error. Junk.

ESP 01S Modules work perfectly! The 4M flash solved my memory problem from my old 1M flash models.Delivery was quick - 2 days - and securely packed.