In this post I will guide you through the jungle of available modules based on the ESP8266. This is not a complete list of available modules but a selection of the ones I could test and review. If you think that I have been missing out on one important module please let me know.Every module here as some advantages and disadvantages, depending on the targeted application. If you are planning to to use a module as Wifi shield for an Arduino you might pick a different type than if you´re planning a standalone node. Other aspects are breadboard compatibility, availability of pins, need for external components such as a serial-to-usb adapter as well as size and costs. The following tables summarise this post, if you are too much in a hurry to read the whole article: Comparison of Raw Modules ESP-01 ESP-05 ESP-12 ESP-201 Testboard GPIO Pins 2 - 11 11 11 ADC - - 1 1 1 Antenna PCB PCB PCB External/PCB PCB USB-To-Serial No No No No No Breadboard friendly Medium Good Bad Good Bad Form factor Small Small Medium Big Very Big Price ~$3 ~$3 ~$3 ~$3 ~$6.50 Application Simple Standalone mode or wifi shield for Arduino Wifi Shield Standalone Standalone Prototyping Where to buy?
This is probably one of the most popular modules, although it is by far not the most convenient one. With its small form factor (24.75mm x 14.5mm) it fits nicely into any enclosure. Two GPIO pins are led out and can be used to control periphery. With proper wiring and a serial-to-usb adapter you can also easily flash alternatives firmwares on it. By default it comes with one of the different versions of the AT firmware which allows you to use it in combination with an Arduino. One of the biggest problems of this module is the placement of the pin posts which makes it impossible to plug it directly into a bread board for prototyping: the two rows of posts are so close to each other that you would get a short-cirtcuit.
However you can still use this module on a breadboard: either build a bread-board adapter or use female-to-male dupont wires to wire the module to your bread-board. Update: There are now also versions of the ESP-01 available, compared to the ESP8266 ESP-01 module. This module allows you to access many features of the ESP8266: 11 GPIO pins, one analog-to-digital converter (ADC) with a 10 bit resolution. It also lets you easily configure deep-sleep mode which () lets you run the module for 3 years on two AA batteries. With one drawback: it is not breadboard friendly at all. As for the modules previously described here the antenna is a track on the PCB which delivers good results for Wifi sensitivity.
But to use it for prototyping you´ll have to build something around the module. You can order these breadboard adapters or build one yourself, like my colleague Andi did. Shabloni plakatov i stengazet k yubileyu zhenschini 50 let me get. It is currently my preferred module for prototyping since it is breadboard friendly and offers similar access to the chip pins as the ESP-12 does. I say breadboard friendly with two remarks: the four pins at the head of the module keep you from directly plugging the module into a breadboard.
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But you can easily bend them to ninety digrees or unsolder them and place them on the upper side of the module. The second note is that the module itself hides many pins of the bread board for direct access and leaves only one row visible on each side of the module.
If you need more you will have to extend a 5-pin row by connecting it to annother row on your breadboard. The board comes with a printed PCB antenna but also with a connector for an external one. This makes this module also a perfect candidate if you need to bridge a longer distance with your Wifi module. You can then easily replace the package wire antenna with a high-gain antenna and improve the sensitivity even farther. There are various test boards available. Check the links and view the picture below to see what I´m describing here.
Unfortunally ESP didn't keep good records of old serial numbers. Many records have been lost during years and most of all were destroyed in a fire accident on. ESP Dave Mustaine - ESP produced several guitars based on the custom models of Dave Mustaine until 2007, when he left the brand for Dean Guitars. The DV models lack a 24th fret inlay. ESP Axxion - fretboard is ebony with XX inlays and available in black. ESP DV8 - fretboard is ebony with 8-Ball Inlay on first fret. It is available in black, snow white and metallic silver.