Espressif, the company behind ESP8266 (EX) Wi-Fi chip for IoT applications, has now opened store on Taobao, where they sell WROOM-02 and WROOM-02 modules based on ESP8266EX with FCC, CE, TELEC, and SRRC certifications.
WROOM-01 has some soldered headers that make it easier to use for hobbyists and prototyping, while WROOM-02 is more compact, and should be more suitable to include in your own products. But otherwise, they share about the same specifications:
- SoC – Espressif Systems ESP8266EX 32-bit RISC processor @ 80 MHz with integrated WiFi
- Wi-Fi – 802.11 b/g/n with STA/AP/STA+AP operation modes
- Header – 2x 18-pin headers with SDIO 2.0, GPIOs, SPI, UART, GND and 3.3V pins
- Dimensions – 11.5mm x 11.5mm
- Temperature Range – -40C ~ 125C
- Certifications – FCC, CE, TELEC, and SRRC
The company can also provide “hardware reference design, antenna design, and SDK for secondary development”, but you’re likely to find most of what is needed for development, including the SDK, on esp8266.com. You can also checkout WROOM-02 datasheet.
Both modules sell for 20 CNY (~$3.22) on Taobao, before shipping, but in due time they should also show up on Aliexpress stores.
Thanks to Jon for the tip.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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hmm.. how is this different than the already existing modules on the market. i assume they had to make some changes (like better shielding) to gain FCC approval?
And MicroPython now has networking support for the ESP8266 ( cf https://github.com/micropython/micropython/pull/1211 ). And they are looking for testers as it is brand new
Note that the WROOM devices have modular FCC approval. So if you use them in your larger design you won’t need to redo FCC approval.
It is important to check that FCC IDs are valid. For example the AI-THINKER module has a big FCC label on it but I have been unable to locate the listing for the module in the FCC ID database. Maybe it is there, but I can’t find it.
If you look up the WROOM 2AC7Z-ESPWROOM02 FCC ID here: http://transition.fcc.gov/oet/ea/fccid/
You will find it properly listed.
You need to contact Espressif for volume pricing on these units. Maybe CNX can get a Q1000 price out of them. The $3.22 is Q1.
This module is rated 120C which is the highest temp rating I know of on a wifi SOC module.
It’s been long four days since your last post and I really missed your interesting topics , I hope everything is OK.
@Abdullbasit same here!
Yep, you are right. It is for some time that I have been inquiering about validity of ESP-12 module certification:
http://www.esp8266.com/viewtopic.php?f=13&t=1179&sid=b9a2a7ddd3e9164a5223ba9a0c1466e1&start=10
http://www.esp8266.com/viewtopic.php?f=6&t=2568&p=15361#p15361
http://www.esp8266.com/viewtopic.php?f=13&t=2560
I still can not see FCC ID printed on the on the enclosure shield, but maybe this is not necessary (it has to be maybe on the enclosure of your product, I am not sure).
Anyway, this goes in the good direction.
Thanks Jon for FCC reference number.
Some more links for reference:
https://apps.fcc.gov/oetcf/eas/reports/GenericSearchResult.cfm?RequestTimeout=500
http://fccid.net/number.php?fcc=2AC7Z-ESPWROOM02&id=741233#axzz3ZIq8pH00
BR,
Drasko
This will push those esp8266 module vendors out of the market, there are plenty of them.
it’s rare for a chip vendor that wants to compete against its downstream module vendors however.
the price is unbeatable though.
The labeling on the the WROOM module is not correct according to FCC specs. But have real progress here- a verifiable FCC ID in the database. They need a sticker on the module with the ID. Like this:
http://newimg.globalmarket.com/PicLib/125/1983125/prod//8_1373692240563_l.jpg
From FCC docs…
The licensed module must have a FCC ID label on the module itself.
• The FCC ID label must be visible through a window, or
• it must be visible on an access panel, door or cover that is easily removed.
• If neither of the above is possible, a second label must be placed on the
outside of the device that contains the following text:
– Contains FCC ID: bzzzzzzz.
Example of a “contains” label
http://www.remoteuncoupling.com/images/FCC-10100.jpg
Should include the MAC address on that sticker too. But that is not required.
I’ve been told AI-THINKER ESP-12 module has passed FCC too -> http://fcc.io/2ADUIESP-12
Yes, it has been discovered that ESP12 has FCC too. The reason why that took long is that the ESP12 is missing the label the FCC requires. If you look at your link – there is a section entitled “FCC ID Label and Location” where they have included the sticker needed to pass FCC. But then they failed to put that sticker on their production units as required.
Because there is no FCC ID sticker no one knew what the FCC ID was. Looking up AI-THINKER didn’t work because the paper work was filed under “Shenzhen Anxinke technology” not AI-THINKER.
Moral of the story – put the FCC ID number on your modules, it is required.
@Jon Smirl
> Should include the MAC address on that sticker too. But that is not required.
Speaking about MAC, I ordered some time ago one thousand of AR9341 routers from a small OEM in Shenzhen… and all the MAC were identical ! (they just “forgot” to make the MAC unique… Not sure how “legal” it is to have a non-unique MAC address, but that can happen ! 🙂 ).
=> I had to do find myself the proper offset in the NOR, hack my devices to get root access, and automate something on each device like “./busybox dd if=/dev/urandom of=/dev/mtdblock4 count=3 bs=1 seek=9 conv=notrunc” (This is not perfect as it does not avoid collisions, yet that’s the best solution I could find in a rush)
Hi,
I took a look at the schematics of the ESP-WROOM-02 module.
There’s no SAW filter between the RF chip and the antenna.
That’s not usually a good sign because it may be difficult to pass the FCC and R&TTE tests from 10 dBm up to 20 dBm transmitted power.
Power Amplifiers have huge non linearities over 10 dBm which means power transmitted on the harmonics.
The only way to filter out the harmonics is to use a SAW filter.
Without saw filter the only way to pass the FCC and R&TTE tests is to transmit a lower power level which in turn means shorter distances.
RF-Engineer
@RF-ENGINEER
Here is the FCC report
Direct FCC link: http://fcc.io/2AC7Z-ESPWROOM02