Working with serial console is important for at least two reasons. First one is to allowing direct control of your embeded device from you computer through USB cable and the second is debugging of your application. There is nothing better than seeing on your terminal every message that was printed out on your board [1]. You can visualise in that way program flow, errors and every value that is important to your calculations. Let’s see how to do it. Hardware First of all, if your board does not come with USB to UART converter you will need some external controller....
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When we come across nRF51822 [1] processor we immediately new that this is something extremely interesting and will let us do plenty of cool stuff with microdevices or so call wearables Do be honest we didn’t even bother to check any other chip for similar functionality. It has everything that we need: Cortex M0 CPU, integrated 2.4GHz radio circuit,Real Time Clock, plenty of GPIOs, DAC and other stuff that you expect to find in other microcontrollers. Hardware features alone might make you enthusiastic about this chip, but this is even more to come. Second the most important factor for hobby...
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Design requirements Primary design goal of this product was power efficiency. Every single component was carefully picked to have as low current requirement as possible. Good support for sleep mode was a must have. Feature set was a second major consideration. Except of accelerometer we plan to add barometric pressure sensor to track altitude in outdoor activities but also absolute depth in underwater. 1200mbar should be enough to be able to position tracking band underwater up to around 1.8 meters [1]. Important part of our device is storage capability allowing to register as many as 12h of data in rating...
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