Sonoff Micro WiFi Smart USB Adapter Sells for $5

ITEAD Studio Sonoff family of WiFi-powered home automation devices is convenient to use with voice commands or mobile apps, and for those who want to more control over what runs in their network, Sonff devices are usually compatible with open-source firmware such as Sonoff-Tasmota.

We’ve very recently written about Sonoff D1 smart dimmer switch, but the company also launched Sonoff Micro WiFi smart USB adapter that allows you to control USB powered devices.

Sonoff Micro

Sonoff Micro specifications:

  • Power
    • Input – 5V/2.5A USB type-A male
    • Output – 5V/2.5A USB type-A female; BC 1.2 charging, max 1A output for charging
  • Connectivity – 802.11 b/g/n WiFi 4 @ 2.4 GHz
  • Misc – Power and WiFi LED’s, switch button
  • Dimensions – 45 x 30.5 x 26 mm (PC V0 flame-retardant material)
  • Weight – 17 grams
  • Certifications – CE, FCC

There’s no integrated power supply, so Sonoff Micro targets specifically USB power devices such as USB LED light strips, USB desktop fans, USB desktop lamps, or USB water pumps. It works the same way as other Sonoff devices via eWelink mobile app or through voice commands going through Amazon Alexa or Google Home. One of the use cases listed by ITEAD Studio is to prevent overcharging, but I doubt this is an issue for recent devices.

If we read the YouTube comments, we learn that Sonoff Micro is not based on Espressif ESP8266, but instead CKW04 chip. I could find very little information on the web, except for some files in Chinese on Github that show a 6x6mm CKW04 i802.11 b/g/n 2.4 GHz WiFi module developed by Coolkit. That probably means Sonoff Micro won’t be supported by Sonoff-Tasmota open-source firmware, or that it may take a while before support is implemented.

Sonoff Micro can be purchased for $4.99 until December 19, after which it will sell for $6.49.

Thanks to Andreas for the tip.

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15 Replies to “Sonoff Micro WiFi Smart USB Adapter Sells for $5”

  1. Hum, this could be useful to provide intelligent charging for any phone… someting like Qnovo on Sony Xperia devices. Would require some software on the device side but seems feasible.

  2. Looks like they have a bunch of wireless products, including GSM and Zigbee, as well as WiFi. May be interesting to see if those docs get translated like the ESP8266’s did!

  3. Too bad that there’s only one usb, I would take more ports or even wifi controlled USB hub on the spot.
    Let’s hope that itead will release some sdk for this chip too.
    Btw. USB per-port power switched hubs are pretty rare (uhubctl), somebody could make them cheaper. 🙂

  4. Was looking for something to be able to restart my crashed Pi remotely. I wonder if this would work although I’d prefer tasmota so might better to use an s26 socket instead.

    1. Good find. The marking on the chip reads
      “eWelink support

      now this brings the question of whether CoolKit makes its own chip, or did it just changed the markings?

  5. Coolkit seems to sell ESP8285 based modules (as found in their website, in the downloadable documents). So, in the end, it might still work with Tasmota.

  6. Very bad.
    I have already bought the adapter and in front of me. And now I stand there and can only put him in the closet and wait and hope.

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