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/diy/ - Do It Yourself

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>> No.1153200 [View]
File: 316 KB, 1000x933, Square Wave Outputs.jpg [View same] [iqdb] [saucenao] [google]
1153200

>>1153185
DC coupling it seems. Haven't touched the settings, just bought the scope like 2 weeks ago.

I think I may have found the problem though.... I put 1K pullup resistors from the output pins to VCC and now I'm getting proper square waves (pic related). I forgot that the P0 ports (that I'm using as outputs) of the 8051 are open drains.

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