This is a MOD version of MR13U portable 3G router. RAM is 64MB, Flash is 16MB(Originally 4MB).


Architecture: MIPS
Vendor: Qualcomm Atheros
Bootloader: U-Boot
System-On-Chip: AR9132 rev 2 (MIPS 24Kc V7.4)
CPU/Speed 24Kc V7.4 400 Mhz
Flash-Chip: Spansion FL032PIF 32Mbit
Flash size: 16 MiB default 4MiB
RAM-Chip: Zintel A3S56D40FTP 252Mbit
RAM: 64 MiB default 32MiB
Wireless: Atheros AR9103 2.4ghz 802.11bgn
Ethernet: RealTek RTL8366RB Gigabit w/ vlan support swconfig
Internet: n/a (via external dongle: 3g/LTE) or STA+AP mode
USB: Yes 1 x 2.0, 1x MicroUSB for battery charging/power supply
Serial: Yes
Battery: 4x Li-ion 18650 LGABB41865




Compile the CC15.05 firmware with kernel 3.18.20


  1. Modify the profile to support 16Mb-LZMA
  2. Flash it using Ethernet.
  3. Setup STA+AP mode (IP should be different from your home router)
  4. Enjoy!


When I put the MR13U on the table and keep connection to the home Wifi router, it runs for 5 days!


Making a Openwrt fridge camera for my wife


When I was doing the retrofit kits project in relayr, I asked my wife which smart home device is most needed by her. “Of course fridge cam!” She replied without hesitation.

Why not developing a fridge cam using OpenWrt? Since the battery life is pretty good, I think it is also possible to use power management module in Openwrt to extend the battery life.

IMG_7346 IMG_7348



Usually the fridge will turn off the lights when door closed, so I chose a camera with LEDs integrated, and the resolution is 200W pixels. Most importantly, it has a wide angle lens 150 °.

Install the following packages:

opkg update
opkg install kmod-video-uvc 
opkg install mjpg-streamer


The software side is just using mjpg-streamer, so enable the streaming using:


mjpg_streamer -i " /dev/video0 -r 640x480 " -o " -p 8080 -w /www/webcam"


Then go to

You can clearly see from the picture that the quality of the picture is pretty acceptable inside the fridge!


The power consumption of the camera:



When it is running, the module takes 0.14A current from the battery.

If you want to buy this camera, please contact me:) We have another infrared version!



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