Combine a Yocto-Light-V2 with a YoctoHub-Wireless-g to get an autonomous appliance with built-in network connectivity:
The Yocto-Light-V2 device is an USB ambiant light sensor (lux meter) which will allow you to you measure ambient light up to 65000 lux. Measurements can be directly read or stored on the device internal flash for later retrieval when connected again.
This module can be used in conjunction with a directional light source to create a light barrier, as it is very reactive. This device is a possible replacement for the Yocto-Light V1, which is not produced anymore. The other option is the Yocto-Light-V3, which is less reactive but whose light sensitivity spectrum better matches the human eye.
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The YoctoHub-Wireless-g is a wireless-enabled module that can host three Yoctopuce modules to access them remotely through a Wifi network (802.11g). It can be powered either by a USB Micro-B cable and a regular phone charger, or a 5V battery pack.
Three Yoctopuce modules can be connected directly, one of which can be fixed directly on the YoctoHub-Wireless-g and connected using a Board2Board-127 connector. More devices can be connected, thanks to the YoctoHub-Shield extension. The YoctoHub-Wireless-g can power Yoctopuce devices up to 2A.