The module was purchased from ali express. Costing around dollar 10 US.
During shipping, perhaps due to some load over the package, 2 of its tiny components (which i initially assumed one as being a resistor and the other as capacitor) were broken off the board. A corner of the IC was also damaged.
I decided to retain the product as it was and repair it myself. Claim was not put on aliexpress.
While searching internet for its schematic i learnt a lot. And to summarize i came across all the SCHEMATIC DIAGRAM and original board 3D model. So it was an open source project of SparkFun? Yes. Definitely. They officially gave all data online at GitHub.
And so,
I opened the schematic, and those were two 0.1uF capacitors that were broken off the board.
And from my collection of components i repaired the board.
Its good as new again.
And tested to work.
The problem now remains refining the code, and perhaps the site where electrodes are attached need to be checked too. I being a doctor, understand ecg very well, and this hardware will soon give a quality tracing.
Viva la fiesta.
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