Features:

  • Note:There are a batch of this ESP01 modules are the new grade version. Maybe there are some different between the new one and old one in the aspect of usage. Pls feel free to email us if you have any question about how to use the new vertion module. How to email us? Click "MakerFocus" and click "Ask a question". There is the way to guide you to use the new version in the pictures, pls refer to the pictures carefully.
  • Version II to test this module youtube tutorial: https://youtu.be/HDt8FS9t6lI ; Version I youtube tutorial: https://www.youtube.com/watch?v=qU76yWHeQuw
  • Link to view the technical details, https://nurdspace.nl/ESP8266, Introduction: https://github.com/sleemanj/ESP8266_Simple
  • Model: Esp-01.Compatible with Arduino. Support 3 modes: AP, STA, AP + STA
  • If you receive different versions moduleļ¼Œ please carefully follow the pictures and youtube video to test.
Great for wireless projects

Great programmable wifi chips. Default firmware isn't great, but you can flash them. I didn't try to OTA update them, but flashing worked fine from the Arduino IDE - you just have to pull CH_PD high and GPIO0 low, then connect the reset pin to ground first. I had a few issues connecting to an API over HTTPS, but was able to get around it by setting up an AWS intermediary.

Very nice little WiFi controller!

Doing small home improvement projects I did not realize what I was missing out until I discovered these. If you wanted to wirelessly control something, like an LED, you would normally buy a $20-30 smart plug and a power brick to plug into it, that would ultimately control your LED or motor. With this module you can put together a reliable and secure remotely controlled application in just hours. With Arduino studio and other free software out there you can quickly create all kinds of smart things and ultimately connect them to any home automation hub (I have Wink), Alexa, or anything else. Another huge advantage of these devices is that they do not require any specific manufacturer's cloud and app to operate - simply connect to your WiFi and do the job.

None of them worked. Update all of the replacements worked

First I tried the ESP-01 flashing circuit that I used in the past and none of them would go to the AT command mode, I would see READY but could not go beyond that. I the tried using the Arduino UNO as the programmer. The terminal session came up as it should in the AT command mode and worked great. I then tried to flash the example blink program to it. It looked like it was working but when it was done the ESP module was not blinking and it would no longer process AT commands. Update 5/14. The seller immediately sent out 4 replacements. For some reason withe same flash setup they all worked. I don't know what the problem could have been but thanks to the sellers quick response every thing is good now.

Worth it. Love these chips

I have 2 orders of this product. The first order all the 1MB chips work great; got me hungry for another order. The second order contained two 4MB cache units and two 1MB units. One of the 1MB has a bad efuse [bricked on arrived]. The two 4MB make up for the bad one 1MB i got i guess... Overall happy with the purchase given the price per unit. In both orders, the chips arrived in a single anti-static bag so not individually bagged as the product photo would suggest; ultimately not a concerning factor... would buy again - and will in the future. Thank you MakerFocus.

Overall these perform as expected and I am happy. I will probably purchase more later on

I've used 2 or 3 of these now and they work as expected, I haven't had any issues. I did have to make a breadboard-compatible breakout adapter for them with some male and female headers, but I expected that and it wasn't too difficult. I program them with a CH340 serial adapter, on which I've soldered a jumper connection between GPIO0 (pin 5) and GND (pin 1), as well as a button between reset (pin 6) and GND. Overall these perform as expected and I am happy. I will probably purchase more later on.

Updated review

Theses actually work. The difficulty is programming. The best option is to use an esp8266-12 to program. I will post a diagram of this shortly.

All of them work

All 4 ESP-01's tested with the blink sketch and all are working great. So far I've made a IOT button with one and it has been working for a week so far. You can find these cheaper but nothing beats the 2 day shipping! I used the USB to ESP8266 serial wireless wifi module to program along with a push button soldered on to enter programming mode

All worked great!

Good quality, no problems whatsoever with any of them.

They work great. I had not issues powering them and none ...

They work great. I had not issues powering them and none were DOA.

Get started fast on implementing that micro-controller idea.

Let's be clear, this is not going to replace your computer, it's not a replacement for a lot of micro-controllers, but that doesn't render it useless at all. You will see many reviews telling you that there are only 2 GPIO pins. That's not quite true. The reality is that there are four physical GPIO pins on the connector, as both the rx and tx pins are usable as gpio pins, just as pins D0 and D1 on an Arduino Uno are usable. It presumes that you are not going to use them for serial IO, but if you are setting this device up to gather data from devices, and upload that data across a wifi connection to a server or to one of the various cloud services, you really don't need the rx/tx pins for console io anyway, and making use of them isn't a bad idea. As you go through the various sensors and output devices you will find that there are a lot of them that support or even only use i2c or iic. Pretty much any of those devices that have arduino support libraries can be used directly off of any of the gpio pins that are set up as sdc and sda. Probably the most frequent example of this is to chain together several i2c devices, a real time clock, a humidity/barometric pressure/temperature sensor, and an OLE display with i2c connectivity, and you've got a watch sized weather station. Or skip the Real Time Clock as you can get the time via ntp off of an even more accurate time source. Use a pcf8574 to turn those two i2c pins into 8 io pins, or better yet hang 8 of them off the i2c pins and get 64 i/o pins (digital) and continue to use the pressure temp humidity sensor at the same time. Oh, and you can use those 64 pins of i/o to drive a 16x16 array of LEDs, or use charliepixeling to control 4032 leds in a much larger display. Or put a 4x4 keypad on one pcf8574 and so on. The processor on the esp8266-01 can handle that load, though you may start to see throughput bottlenecks on the i2c bus. You can also mix busses, use i2c on the gpi0 gpi2 pins, and put a dht22 on the rx pin and a collection of Dallas OneWire devices on the tx pin. Yes there are limitations on this device. I don't recommend using it to try to build a web based oscilloscope, but even that is possible so long as you're not looking for high frequency capture. (At some level, looking at a chart graphing the change in temperature detected by a sensor is just that after all.) But it can easily be a part of many micro-controller projects, either as an interface providing WiFi, or as a stand alone micro-processor with some really outstanding characteristics.

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