Despite the standard radio communications on the market, such as Wi-Fi, BT and GPRS, there is still a big market for customised radio solutions. The price, energy consumption and distances are often decisive factors when selecting an ad-hoc solution rather than a standard radio or protocol.
At RBZ we design radio systems on the 166 MHz band, which enable greater range while using the same power. In the following example we use a radio on this band and a protocol designed by us to transfer data between independent devices and base stations located in large, unpopulated natural areas. The equipment collects location data via a GPS and the log is uploaded to the base stations when it enters their coverage areas.
Other design transmits just a simple identification number over 433MHz band. What is interesting is that the power source is extracted from a coil and a magnet inside a tube. It was designed to attach it to a reindeer and send the identification every time the animal ducks its head to eat. no needing any kind chemical batteries to power the electronics.
Another example of radio custom is a respiratory flow sensor which sends the data via a 2.4 GHz link, using Nordic Semi technology. In this case the price of this solution compared to BT was a decisive factor. A specific protocol was also designed which enables programming similar to that used for sockets and supported by an RTOS.