Deegoo-FPV ESP8266 ESP-01 WiFi Modules, 4-Pack | 2.4GHz serial WiFi modules for Arduino-compatible boards, microcontrollers, IoT prototypes and wireless projects.

Good to go & packed safely.

Given the set of AT commands you can throw at this thing, it can do some pretty cool things with just a little power. I have seen it: * Join a wireless LAN * GET from a website * POST to a website * Work with a PiCo * Work with Arduino IDE's Serial Monitor * Work with an obscure 8-bit microcontroller You can interface this thing with a USB-to-TTL bridging device and make it turn into a LAN server even. You can configure it that way to join your LAN automatically. And you get four in this package. It uses a fair amount of power when it is going full bore, but not compared to a router, for example. It can be set to sleep modes to conserve power. I think it is something like 70-90mA. Speaking of power, it would be nice if the LEDs could be completely shut off to avoid unnecessary consumption. This package is so small, desoldering seems kind of risky.

These things work really well, especially considering their size. They use serial to connect to your Arduino or whatever, and use an extended AT command set to configure it, connect to WiFi and send/receive data. They also support AP mode so would be ideal for configuring your WiFi settings by first connecting your laptop/phone/etc to your project's own WiFi connection. If you're using this with the Arduino IDE there's a great library available on GitHub - search for ITEADLIB_Arduino_WeeESP8266 It's not breadboard friendly, but that's easily solved if you buy the adaptor, make one, or use Dupont wires.

These are great little devices to set up home automation or IoT. Very easy to get running if you have worked with Arduinos in the past, although you need to be able to program with either a Uno set up as a pass thru or an FTDI cable. Lots of info out there to help. I used two of these to interface with my two garage doors. Toughest part was getting one of the GPIO pins to act as an input for the door sensor. After that was done, piece of cake.

The internet is littered with issues people have had with these modules. In my case I finally figured out that after grounding GPIO0 during a board reset (to get into software download mode) and leaving the module alone for 15 seconds or so, it was possible to upload code without the "timed out waiting for packet header" error message. The "Blink" code that supports these erroneously says the inbuilt LED (identified as "LED_BUILTIN") is on pin 2. It's actually on pin 1, so you have modify the code to run the test program. Finally, the upload would not work at default 115,200 baud rate, but would upload at 74,880 baud, which you can set in AT mode. To make the code run, you then have to reset this module, which none of the advice I read tells you. It's a great little module, but if you are unlucky you may spend days figuring how to make it work.

These things are so ridiculously addicting it’s insane. Extremely versatile and useful beyond any review I can write could offer. I have them all ove my house running small sensors wired up to GPIO2. My only gripe is the red power light. Had to break it off the board and it would be nice to use the deep sleep function but having trouble wiring GPIO 16 to rst. But I love them. Next time I may order ones that have access to more ports but for now, and real small jobs, they’re great!

Arrived quick, and were exactly what they were supposed to be. Was able to program and use right away. Be aware that you’ll need a 3.3v power supply and cannot be used directly with a 5v Arduino. Had to add a level shifter to my project (interfacing with an Arduino mega) to communicate.

Was excited to get these, but should have noticed the fine print. Not surprisingly, all 4 units are dead and unresponsive. despite using known working programmers that work fine on other ESP01s. Maybe I just got bad luck, but all other sellers stand behind their sales.

Worked perfectly. Good speeds and connection.