Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By 8n1
#55169 Hi. Thanks for the info.

Just did some research, here is what i found: (mainly about form factor) ... y-sgs.html
There are altogether 16 pin counts, The external size of the ESP-12S WiFi module is 24mm*16mm*3mm.
Image ... e-esp8266/
* Based on ESP8266 wifi IC
* Fully compatible with forepast versions ESP-12E, or ESP12F
* FCC & CE & RoHS all passed
* Further improved antenna design, better signal performance

Note: They sell the ESP-12S for only $2.40! (This is even cheaper then a lot of 10 at aliexpress right now) ... australia/
This has an improved PCB layout and offers better radio performance over the ESP-12F.
Note that the ESP12S doesn't have the SPI pins at the bottom of the board (see the pinout below). You can use these with our SMD adaptor boards.

I might look like a smaller(width) ESP-12 but it's exactly the same as the ESP-12. It has the same physical dimensions and pinout. The breakout pads of the module are now smaller (no more holes, just castellations). This led to a bigger(width) metal housing which probably causes the illusion of a smaller module.

PS: Just saw that they also improved the ESP-07 (ESP-07S).
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By buchacho
#55191 I just got my 12S the mail... You're right, they are the same size, it is just an illusion. I think it is a tad harder to hand solder. It otherwise seems to work the same. It might be my imagination, but the blue LED seems a little different somehow, like smoother looking in operation.

The ESP-7S is a neat looking module if you need the antenna.
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By rudy
#55194 Is it really smaller? It would seem odd for them to change the size. My thought is that the can is bigger and taking up the difference in space. I would hate for it to be a different size as I have boards designed with the ESP-12(E) footprint.