When I did a teardown of Curv Glucometer, at the same time I did also buy Dr Morepen Glucometer GlucoOne, just for the comparison purpose.
Basically to see how the design differs as Dr Morepen Glucometer doesn’t have USB interface but has a display and powered by single use coin cell battery.
Display on the device has the advantage that you don’t need anything else, you can see results directly on the screen, no app download, you don’t need to learn app how to use.
I learned that they manufacture these devices in Himachal, India.
Let us see what is there inside and how they have designed.
What I am expecting is an MCU with LCD controller and some analog front end circuit for analog measurement from the test strip.
As you can see it has a nice little device with glass display. Two buttons are provided. It powered by single use coin cell battery CR2032 type.
In order to open I had to remove the front plastic cover and then I could further remote keys rubber pads and LCD.
You can see Glass LCD and two keys (SW1, SW2) for user interface.
A piezo buzzer is also provide for audio indication. On the PCB, I don’t see much components. It looks uses a Taiwanese or Chinese special purpose SoC which has every hardware block required inbuilt.
Externally one the low power crystal, a battery and some passive components are used.
Various SMD test pads are also provided on the PCB for testing and programming.
the marking on the Soc is XD102-0015A, I could not find anything on internet.
The LCD used is a segment display type, having elastomeric connector. The conductive pads are there on the display and then a rubber like part is used for connection between LCD and the PCB Pads.
You can clearly see carbon pads on the display below on the right hand side image.
Below is the PCB area and Pads for LCD connection.
Special connector(J6) is used for the Strip.
NTC temperature sensor is also placed near the strip connector for ambient temperature monitoring, probably for the temperature compensation.
That’s all in this teardown. I hope you found it interesting and learned something new today.
I will write a new blog soon. Do share with your friends.
I work as an embedded systems design consultant, helping companies build custom embedded products and develop test automation solutions for their PCBs.
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XD102-0015A looks like an 8 bit micro manufacturer by Holtek and branded with OEM code.