As I already announced: the startNext campaign goes on! Until the 17th October everybody has still the opportunity to support the campaign!
Please share and like the project! According to the number of visits only half all visitors need to contribute € 10 and the blueReader would already be funded!
What else is new? The prototype, with alternate firmware, runs and runs. After the first 9 hours of continuous operation it worked yesterday 16 hours without any problems. As I have yet to implement the monitoring of the battery, the battery was discharged very deeply after the 9 hours and the prototype had to spend the last night on a proper charger.
Now the blue reader is running again for over 15 hours and I’m curious how long it keeps sending me values …
Two common questions have arisen:
- Will the sensor not be damaged it is repeatedly scanned?
No, after all our knowledge and understanding of the built-chip, the sensor draws the transmissionpower from the nfc-reader. Simply put, you can say it like this: The chip consists of two parts, one measures every minute the Glucose value and does all the pre-evaluation. This current value is written in a memory where all the past values from the last 16 minutes are. In addition, it writes every 15 minutes a historical value into the memory. These are the values which the readers retrieves and from which it generates the curve of the last 8 hours. The other part of the chip for communication with the reader, or in our case the blueReader. This part is “activated” by the electric field, which is build up by the reader. This electric field is not only for the detection of the sensor, it also provides it with power and by “disturbances” of the field the actual data is transmitted.
- How do you attach the blueReader at the sensor?
I don’t attach anything at the sensor. The chance is much to high to accidentally rip off the sensor! I still have to pay each sensor out of my pocket, because my health insurance does not consider this system to be necessary…
- But how are you attaching the blueReader now?
I’ve secured the first prototypes mainly with Velcro (an industrial type, which consists of Velcro and fabric with adhesive surfaces).I put a plaster or wound dressing over the sensor, one side of the Velcro on it, the other side onto the antenna of the blueReader. The disadvantage of this is that is stick really firm and I’ve ripped off a lot of platters, while trying to put off the prototypes.
Currently I just use a tape strip, like that stuff that is usually used after the quarterly blood analysis to hold the swab on the spot. You can see Pictures of this in the previous post.
On the technical side, I prepare currently the first version of the “real” blueReader firmware. This will have to do without a few features:
- Changeable name
- Changeable connection pin
- Softwareupdate via Bluetooth
However, until the final version is needed, there is still some time. I am now focusing on primary and important features to move forward more quickly and to be able to provide access to the sources as quickly as possible to all interested parties.
Incidentally, I also want to draw your attention to a great project: openAPS
What is it now? One of the many ways how you may want to use a blueReader!
Shortly after I began to occupy myself with the continuous monitoring of my blood sugar using the Libre sensor, I came across a bunch of diabetics, very willing to experiment. This international group of diabetics uses data from all possible available CGM systems with only one goal: to be able to use a pump as an artificial pancreas!
Of course not like our real pancreas, because of sugar, especially the interstitial glucose, which increases only delayed, especially if we have eaten well. However, most of the time of the day we eat nothing and yet our pump can not always respond to our values. We plunge into hypoglycemia because we forgot to reduce the basal rate or forgot to take extra carbohydrates to us. We go high because we are upset, stressed out, having an illness, or simply did not properly assessed carbohydrates.
It is at these points such a system can help! Currently, I asses what my own openAPS system, based on a Medtronic pump 522 and the blueReader prototypes, can do! Currently, the pump, still filled with water and not connected to me, sits next to me, and I look at what the system is doing and why, but in the next few days I will venture into the first experiments on myself 🙂 Until now, the predicted values, what I see the with the help of blueReader and the real, by blood measurements, are looking very good!
Anyone interested in something like this should definitely go here: https://gitter.im into the channel https://gitter.im/nightscout/intend-to-bolus and ask for more information 🙂
… And just now, the blueReader has powered down, again. After 16 hours of continuous operation, where it, very stable, transferred every 5 minutes a value. Tomorrow I will continue to work on the energy-saving options and see if I do not still get it in this one well over 20 hours runtime…
A long wish list for the next prototype has already came out of all the Experiments so far. I hope I can discuss them with my electrical engineer tomorrow or early next week…