Nevertheless, it does have a data port at top of the enclosure. Because this type of caliper uses capacitive effect, sometime, for some reason, if I hold it at end of the caliper, the readings can go crazy, jumping around and number keeps going up.
The worst thing is, it is made of “plastic like” material, the vendor claims that it is made of carbon fiber, but I really doubt it. Second of all, its resolution is only 0.1 mm and it has only one digit after decimal point. First of all, it is dirt cheap, it costs about 3 USD including shipping. Not able to find my USB logic analyzer and my oscilloscope is dead, I decided to use an Arduino as signal analyzer.īefore diving into complex matters, let me just give you some background about the digital caliper I got. There are some discrepancy, but I think it the poor caliper that is displaying wrong data I totally understand that a cheap digital caliper might have different data protocols, but from what I gathered on the internet, most of these Chinese digital measurement tools use similar format - a clock and a data.Īrduino output matches (closely) caliper reading.
However, most of these digital dial indicators are “expensive” (normally cost about 30 – 100 USD), so I figure to just get a cheap digital caliper costing about 3 USD to start with. I have just encountered the need to read a digital dial indicator for another personal project.
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