LIMITTER

[pedrojrr]

Hola mi nombre es Pedro y soy padre de un niño Diabetico que usa el freestyle libre. Primero quisiera darle mi enhorabuena por el desarrollo del proyecto ya que llevábamos tiempo buscando algo parecido. Estoy deseando que comparta su diseño para poder probarlo en mi hijo sobre todo por la utilidad de guardián nocturno. Gracias por su tiempo y dedicación estoy convencido que seremos muchos los padres que se lo agradeceremos. Espero tener pronto noticias suyas

[1ster]

In the meantime I managed to build my Limitter. Everything is working fine (yet the name is still HMSoft). I had to replace the BLE, and I also replaced the charger (with the Adafruit one you were using originally) since 500mA is said to be too much for a 100mAh Lipo cell.

[michielve]

Dear JoernL, I would like to thank you for this wonderful project that you developed! The MFRC522 NFC reader for arduino was my first try when I did not yet find your project. However, this reader is unable to use the ISO 15693 format and therefore is useless in reading the Fresstyle Libre information. I just ordered all the items you used and will start building it next week. I hope to be able to give some updates at a later stage.

[sean75]

Caro!

Avete già letto questa notizia? È incredibile, sono terrorizzato, basta leggere qui http://answer.atelierparlamer.com/hn/391

Tutto il meglio,giovanni zampaglione

[Verticoe]

Hi, this weekend I finished building the LimiTTer for my girlfriend. It's working as expected and she is amazed and very happy with it. Due to my lack of tools, I improvised a case with a mint-pastille box :-) Thank you very much for this project. Best regards.

[chrisharris751]

Just curious, does the limitter keep reading after 2 weeks? Awesome work. I will be building this in the future.

[JoernL]

@chrisharris751 , yes it keeps reading for about 12hrs ... then the sensor shuts down.

[klettervirus]

First of all, thank you so much for this project. Ever since I got "my" type one some 20 years ago I was dreaming about a sugar watch. Now I have it (limitter+pebble)! I buil the limitter (will build a second one with an armband design, hope to contribute some new ideas there) and used it successfully on one sensor (freestyle). On the new sensor, I am getting a "ArmTimer received negative time" error about 60% of the time. Funny thing is: liapp can read the sensor, but displays the values really funny, there is always a horizontal line going to a time in the future (~4 hours) displaying the current value on the y-axis. Glipm is having a hard time getting the data, the phone vibrates to indicate the nfc connect, double vibrates which used to signal a successful read, but keeps doing the double-vibration without ever showing any value.

I somehow fear that abbott changed something in the sensors to make life harder for the people playing around with their sensors?! Or is there anything else that can cause that behaviour?

As I said, running on freestyle libre with limitter hardware, with a yotaphone 2. Did restarts and reconnects about a hunderd times to no avail....

Using 2.0.6-76d589d-experimental-xDrip2-beta-206-2016.09.24 since I like the pebble support

Again, thanks so much for this great piece of work.

[Verticoe]

We experienced that the LimiTTer looses its connection to xDrip App after about 4 to 5 hours after taking it from the plug and its not possible to recconect. Me and my girlfiend assume that its the battery (240 mAh LiPo). Interestingly, the battery has around 65% of charge left when the connection is lost. So far, I did not destroy that small LED on the Arduino board, which is what I did just now. Maybe this will provide us with a little more time.

[JoernL]

@Verticoe , if it only lasts 4-5hrs and with a battery level of 65% it doesn't work correctly. It is an indication that your LimiTTer doesn't go to sleep. With a 240mAh lipo you should be able to get 4-5days.

[JoernL]

@klettervirus , it is best to use xDrip+ app for your LimiTTer.

[klettervirus]

@JoernL: I will try it, thanks for the tip! But I have found out what the problem was, and it is really funny: I wear the new sensor on the right arm and carry my mobile phone in the left pocket. Too far away, it cannot connect to the limitter! Now I wear it in my right pocket and it´s back to work :-D Evidently the bluetooth connection is limitted (no pun intended). BTW, can I tip you somehow? I love your work and want to support it a little...

[Verticoe]

Destroying the LED on the Arduino board brought some additional time, but not as much as I expected. Maybe something is wrong with the battery itself. I ordered it at Amazon and it came directly from china. Also it was rather cheap. Yet, maybe I did a mistake with the wiring, resulting in the battery drain.

[klettervirus]

I redid all the soldering due to battery problems. Added a switch. Now I am running into some issues: It worked fine one day, the next day I can see the limitter via bluetooth and connect to it. But I get no readings on xdrip+ anymore. I suspect the nfc module is havin some issue... Is there a way to test the function of the nfc without having to hold it against the sensor for 5-10 minutes? What happens if I place it over a used sensor that has been removed? Thank you again for all the work!!!

[JoernL]

@klettervirus , place it rotatory over two expired sensors ... because after 5 same readings the LimiTTer thinks it is an expired one.

[thom1394]

@JoernL , I like your project, but have one question: Having used the Abbott devices for some time (over one year), I have noticed that if I need to read the unit at a high rate (every two hours) the battery on the sensors goes out after about one day (for a sensor that should last two weeks). This has happened on NUMEROUS occasions. Are you having this difficulty reading every five minutes? Thanks

[SandraK82]

HI thom,

I`m using them for over a year now as cgm and this never happened. I even use old Sensors for calibration and Testing of my blueReader for up to two months. Never heard of anybody with problems before. Do you work in a special Environment? Cold tempratures?

• Sandra

On 17.04.2017, at 00:22, thom1394 notifications@github.com wrote:

@JoernL https://github.com/JoernL , I like your project, but have one question: Having used the Abbott devices for some time (over one year), I have noticed that if I need to read the unit at a high rate (every two hours) the battery on the sensors goes out after about one day (for a sensor that should last two weeks). This has happened on NUMEROUS occasions. Are you having this difficulty reading every five minutes? Thanks

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/JoernL/LimiTTer/issues/1#issuecomment-294377730, or mute the thread https://github.com/notifications/unsubscribe-auth/ARjArEx5WEiWFMus-rSADioDQERzsE0Yks5rwpSlgaJpZM4II3zZ.

[thom1394]

No, 'average' temps., etc.  They died after multiple reads with my cell phone.  Thanks, I believe I shall try your setup, should run nicely with my OpenAPS system.CheersOn April 16, 2017 at 3:53 PM Sandra Keßler notifications@github.com wrote:HI thom, I`m using them for over a year now as cgm and this never happened. I even use old Sensors for calibration and Testing of my blueReader for up to two months. Never heard of anybody with problems before. Do you work in a special Environment? Cold tempratures? - Sandra > On 17.04.2017, at 00:22, thom1394 notifications@github.com wrote: > > @JoernL https://github.com/JoernL , I like your project, but have one question: Having used the Abbott devices for some time (over one year), I have noticed that if I need to read the unit at a high rate (every two hours) the battery on the sensors goes out after about one day (for a sensor that should last two weeks). This has happened on NUMEROUS occasions. Are you having this difficulty reading every five minutes? > Thanks > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub https://github.com/JoernL/LimiTTer/issues/1#issuecomment-294377730, or mute the thread https://github.com/notifications/unsubscribe-auth/ARjArEx5WEiWFMus-rSADioDQERzsE0Yks5rwpSlgaJpZM4II3zZ. > —You are receiving this because you commented.Reply to this email directly, view it on GitHub, or mute the thread. 

[SandraK82]

Ouch sounds like one of those mobiles that do fry sensors. Which one are you using?

Von meinem iPhone gesendet

Am 17.04.2017 um 01:21 schrieb thom1394 notifications@github.com:

No, 'average' temps., etc. They died after multiple reads with my cell phone. Thanks, I believe I shall try your setup, should run nicely with my OpenAPS system.CheersOn April 16, 2017 at 3:53 PM Sandra Keßler notifications@github.com wrote:HI thom, I`m using them for over a year now as cgm and this never happened. I even use old Sensors for calibration and Testing of my blueReader for up to two months. Never heard of anybody with problems before. Do you work in a special Environment? Cold tempratures? - Sandra > On 17.04.2017, at 00:22, thom1394 notifications@github.com wrote: > > @JoernL https://github.com/JoernL , I like your project, but have one question: Having used the Abbott devices for some time (over one year), I have noticed that if I need to read the unit at a high rate (every two hours) the battery on the sensors goes out after about one day (for a sensor that should last two weeks). This has happened on NUMEROUS occasions. Are you having this difficulty reading every five minutes? > Thanks > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub https://github.com/JoernL/LimiTTer/issues/1#issuecomment-294377730, or mute the thread https://github.com/notifications/unsubscribe-auth/ARjArEx5WEiWFMus-rSADioDQERzsE0Yks5rwpSlgaJpZM4II3zZ. > —You are receiving this because you commented.Reply to this email directly, view it on GitHub, or mute the thread. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[thom1394]

It was a Samsung.   It worked great if you only used it every four to six hours, but when I used it more frequently, the sensors quit.  Acted like the battery was dead, the more frequently you used it, the faster it would die...I've ordered the parts the parts for the LimiTTer.  Have you seen the folks that are looking at placing the xDrip+ in the OpenAPS rigg?  That combination, with the LimiTTer, looks sweet....On April 16, 2017 at 4:49 PM Sandra Keßler notifications@github.com wrote:Ouch sounds like one of those mobiles that do fry sensors. Which one are you using? Von meinem iPhone gesendet > Am 17.04.2017 um 01:21 schrieb thom1394 notifications@github.com: > > > > No, 'average' temps., etc. They died after multiple reads with my cell phone. Thanks, I believe I shall try your setup, should run nicely with my OpenAPS system.CheersOn April 16, 2017 at 3:53 PM Sandra Keßler notifications@github.com wrote:HI thom, I`m using them for over a year now as cgm and this never happened. I even use old Sensors for calibration and Testing of my blueReader for up to two months. Never heard of anybody with problems before. Do you work in a special Environment? Cold tempratures? - Sandra > On 17.04.2017, at 00:22, thom1394 notifications@github.com wrote: > > @JoernL https://github.com/JoernL , I like your project, but have one question: Having used the Abbott devices for some time (over one year), I have noticed that if I need to read the unit at a high rate (every two hours) the battery on the sensors goes out after about one day (for a sensor that should last two weeks). This has happened on NUMEROUS occasions. Are you having this difficulty reading every five minutes? > Thanks > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub https://github.com/JoernL/LimiTTer/issues/1#issuecomment-294377730, or mute the thread https://github.com/notifications/unsubscribe-auth/ARjArEx5WEiWFMus-rSADioDQERzsE0Yks5rwpSlgaJpZM4II3zZ. > —You are receiving this because you commented.Reply to this email directly, view it on GitHub, or mute the thread. > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub, or mute the thread. > —You are receiving this because you commented.Reply to this email directly, view it on GitHub, or mute the thread. 

[berniemcintosh]

I use a NFC scanner similar to JoernL's design, I have so far ended up with two ruined sensors. On both occasions I used the Abbot scanner to start the sensor but then never used it again, relying only on my own device. i.e. the Abbot scanner never actually took a BG measurement once. After two days the sensor was dead. This has happened two times and I have a suspicion that this course of action is what has caused the problem.

Now on every occasion when I start a new sensor, I only use my own scanner after taking at least one measurement with the Abbot scanner. I do wonder if, when it takes the first measurement, it is doing something to the sensor and that making use of the sensor without this first Abbot read causes a subsequent problem.

Not enough evidence to prove anything, but I can't afford, nor have any desire to test this theory further. I do know that I use my scanner which has a wake up time of 5 minutes, 24x7 and apart from these two occasions have never had a problem. I also have noted that used sensors can be used for testing purposes many weeks after being removed.

B.