Waveform shape is not horizontal

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arunrawat2112
Posts: 1
Joined: Fri Oct 20, 2017 7:52 pm

Waveform shape is not horizontal

Post by arunrawat2112 »

I recently purchased a dso138 from aliexpress. It is a preassembled kit. I have tested all voltages and everything seems okay. The test square wave of 1 KHz is also fine but when I am connecting it to arduino or stm32, I am not getting the desired wavefor.
20171021_011024.jpg
In the picture above STM32 is keeping the pin high for 200 ms and than low for 200ms. The pulse width is coming fine but the problem is with the alignment..
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