This is a MOD version of MR13U portable 3G router. RAM is 64MB, Flash is 16MB(Originally 4MB).
|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|
|Battery:||4x Li-ion 18650 LGABB41865|
Compile the CC15.05 firmware with kernel 3.18.20
- Modify the profile to support 16Mb-LZMA
- Flash it using Ethernet.
- Setup STA+AP mode (IP should be different from your home router)
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.
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 "input_uvc.so /dev/video0 -r 640x480 " -o "output_http.so -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!