As mentioned in another thread, I'm building a new reader for the biothem chip (yes, I created a new account, I decided I should use my name rather than a handle if I'm going to be selling stuff), since the only current readers are very animal oriented and not ideal when using the chip in humans.
The current system I've designed consists of a coil antenna, an RFID decoder chip, an arduino nano, a bluetooth module and a battery. also an android app for viewing the data and configuring the reader.
Since I figure there will probably be at least a few people who want this system, I should ask exactly what people would like to see in the final design.
Feel free to suggest anything, but things I'm particularly interested in hearing about are:
case shape/design. currently the plan is to 3d print cases. right now I'm just dealing with a flat-ish rectangle, with slots on two sides where a strap can be fitted to hold the reader in place on an arm or leg. any suggestions?
battery life/size/shape/weight. naturally longer run time is better, but having a larger battery costs more, takes more space and is heavier. what trade off do people want? one thing to point out is there are two modes of operation: 1) only read the temperature when the user presses a button, 2) read the temperature every few seconds/minutes (as configured by the user), the more frequently you read the temperature, the more power is used. personally I feel it would be good to run for around 12 hours, while reading once a minute, but that requires a reasonably large battery. thoughts?
other possibilities which might be cool, but may make the system cost more, for now I'm not planning to include these features, but if there is enough interest I will, and for software features I can add them later if people want them.
standalone mode: rather than only sending the data to a smartphone, the reader could have added storage to save values read, and transmit them in bulk later.
apps for other OSes: right now I'm only working on android, but I could build apps for iOS/windows/linux etc. apps are free, but I'll need to change more for the reader to account for the time for me to build each app. I will opensource the android app, so if you'd rather, you can port it to other devices yourself.
built in display: currently the only way to view the temperature value is on the smartphone, I could add a small display to the reader to allow reading value without needing a smartphone.
more ways to export data: currently the app lets you view temperature values, save them to a file and send them in an email. I could add things like facebook sharing etc. personally I don't want that kind of feature, but maybe other people do?
depending on which features we go with, I'm hoping to keep the price at no more than $100, but if people want every possible feature, it will cost more.
This is your chance to choose the reader design, tell me what you want and I'll try to make it happen