Combine a Yocto-4-20mA-Tx with a YoctoHub-Wireless-g to get an autonomous appliance with built-in network connectivity:
The Yocto-4-20mA-Tx is a USB 4-20mA signal generator. With this device you will be able to drive any other device featuring a 4-20mA input. This is an isolated device: the USB part is electrically isolated from the current loop part. The Yocto-4-20mA-Tx can drive any current loop powered from 12 to 24V with a 0.1% precision. Cherry on the cake, the device can detect if the loop is properly powered or not.
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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.