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October 13, 2010
about 5 years ago
I have a strange problem with this device: I received it yesterday and tried it on a breadboard. It worked really well, both in key mode and in serial mode.
However, when I lifted it out to move it to a more permanent setup, I found some strange white dust on the bottom side.
One of the tiny brown SMD elements (is that a resistor?) is reduced to a smaller metallic-looking core. The device still works just fine, but this doesn’t look good.
I used 5V through two diodes as suggested in the data sheet, and 390 Ohm resistors on the data lines using a 5V microcontroller - I don’t know what I could have done wrong.
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