RadioJay tags

Altimeter tags

RadioJay A2 (aka Mostag V2)

The first tag, RadioJay A2 ("Altimeter"), was developed in the context of tracking birds using Motus around offshore wind farms where flight altitude is of prime interest. The tag is compatible with the CTT 434Mhz radio technology deployed in Motus and extends the packets to include live air pressure information, from which flight altitude can be calculated.

This specific version is the second prototype with the primary goal to produce a tag that weighs 1 gram all-included (entire tag and leg loop harness). In order to produce a dozen tags at low cost a flexible PCB substrate was used, which is very thin and thus light-weight. The flexibility was expected to be an issue but seemed like a worthwhile experiment to see whether it's unworkable or not. The tags can be stiffened using a little epoxy and fiberglass.

The tags include a 32 bit microcontroller, FSK radio, pressure sensor, accelerometer, rechargeable battery, and solar cell.

RadioJay A1 (aka Mostag V1)

The RadioJay A1 tag is the very first prototype to test the various components. It uses a standard 1.6mm thick PCB which is way too heavy and all components are on one side for easy testing with the intent that the components on one half would get "folded under" to the other side on the next version, which is what happened for RadioJay A2.

GPS tags

The RadioJay G1 tag is a first prototype to evaluate GPS performance and feasibility.

Low-Cost Motus test tags

The following tags are not part of the RadioJay series in that they use commercial boards but they are similarly open-source and designed to help Motus users with a little DIY.

Motus CTT + Lotek test tag

The Motus CTT + Lotek test tag turns a low-cost off-the-shelf microcontroller test board into a test tag for Motus. It emits both CTT and Lotek "beeps" and helps test proper station operation when setting one up. It also works as permanent monitoring tag when left in the vicinity of a station.