Although I've seen ESP-01 used most places and in this forum, the ESP-04 looks a bit more promising in terms of availability of I/O etc. Has anyone played with these?
[edit: I meant ESP-03, which has the built-in ceramic antenna;
I'll guess the shielded versions are meant/required for FCC approval, if one puts these in an actual product without appropriate extra shielding??]
Shun Technology ESP8266 can
Full range of modules icon
Sections of Module Selection Guide
Price: All prices in modules 12.5-15 between 10-15% lower prices every quarter
Shielded shell which can be over FCC CE certification, export guarantee
Each have their own characteristics:
1 ESP-01 PCB antenna, after matching to do about the open 400 meters from the simple to use
2 ESP-02 SMD package suitable size limit, the antenna can be drawn with the IPX header casing
3 ESP- 03 SMD package, built-in ceramic antenna technology. All available IO leads
4 ESP-04 SMD package, customers can customize the antenna type, flexible design all available IO leads
5 ESP-05 SMD package, only leads to serial and RST pin, small external antenna.
6 ESP-06 bottom mount technology, leads all the IO ports with metal shielding can be identified through the FCC CE certified recommended
7 ESP-07 semi-hole chip technology, leads all the IO ports, with a metal shield, can be over FCC CE Certification IPX external antenna, built-in ceramic antenna can also be used.
8 ESP-08 with ESP-07, except that the antenna is in the form of customers can define their own
9 ESP-09 Ultra-Small footprint, only 10 * 10 mm, four board process! 1M bytes of FLASH impedance matching through the bottom mount technology for strict limits on the volume of products!
10 ESP-10 patch interface, narrow-body design, 10 mm wide. Suitable for light with controller
11 ESP-11 patch interface, ceramic antenna, small size.
ESP-01 ESP-02 ESP-03 ESP-04 ESP-05 would like to know more, Mengchuo below! ! !
ESP8266 Series Module Selection.pdf http://qiannao.com/file/wlsj/68516f09/