After some more testing of the first prototype for my master’s thesis, dealing with wearable devices that provide autonomic feedback, I found out some crucial flaws in the design. Some of them are purely technical, others are related to overall design decisions. However, the main problem of that first prototype was that it did not allow me to continuously experience autonomic feedback for a longer period of time, in order to get some hints on how to properly tune the design. This prototype is a more reliable version simulating pattern of autonomic feedback without being based on actual measurements. In contrast to version one, it comes in the design of a wristband and makes use of components specifically build for wearable computing.
In addition to this primary goal (1) the second prototype has been developed in order to test (2) technological feasibility of a functional prototype using the involved components, (3) evaluating the suitability of the involved design decisions for the next step of the research process.
In contrast to the previous prototype this version uses special conductive thread to connect the devices together and is powered by a durable LiPo power cell. This approach makes the device a lot lighter and far more flexible. The sewing technique is easily applied and provides stability to the circuit through the connections themselves .
Unfortunately, this simple version of the circuit is not yet functional. It turns out that the Vibe Board draws more than the 20mA upon activation that the Flora output can deliver on their own. An additional control circuit is needed to reliably control them without a risk of damaging the microcontroller. I am still waiting for the parts needed to be delivered by post to add this circuit, will update this post once it is done.