HiLetgo 3pcs ESP8266 ESP-01 Serial WiFi Wireless Transceiver Wireless Module Development Board LWIP AP+STA Compatible with Arduino

I love ESP8266 devices. I have about a dozen in my house serving different purposes. These are so small they can fit anywhere, and use very little power. I load ESP Easy on the IoT device, and use them for thermometers, motion sensors, door (reed) switches, and relays to turn on/off lights. The possibilities are endless!

Highly underrated in 2026 for esp-now us with other boards like pi picos or yd-rp2040's. Great value for money. Fast connection and speed. They are tiny and weigh almost nothing. Their functionality is where I think they are underacted as using them as a module vs a mcu. Great quality. Just put in an order for more and and order for the S variants.

These ESP-01 modules have worked flawlessly in my setup so far. The multi-pack is useful for small Wi-Fi projects and for keeping backup modules available. I am giving four stars rather than five because I have not done long-term testing on every board in the pack. I plan to keep testing them in future projects and will update this review if anything changes.

Funciona perfectamente.

Bought this for upgrading our prusa mini 3d printer. It’s was so easy just plug and play and download update for prusa also, a few other steps and bam, no more unplugging and plugging the usb stick. Perfect purchase and fast shipping.

Worst item, did not even work and seller would even give a refund

Worked great out of the box and using ChatGPT, it was really easy to get the device doing things. Recommend and will buy more.

Quickstart: download ESP8266 library for the Arduino IDE. In Tools, select Board: "Generic ESP8266 Module". Change Builtin LED "1". Plug into an auto-download programmer/adapter and hit upload. You can upload a blank sketch, Blink example sketch or whatever. The blue LED should light up. One of my three did not light up or program. It seems like at least one customer had a bad batch for all three.