Timeline for Using a GPIO pin as GND is noisy... why?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 10, 2021 at 21:03 | comment | added | rdtsc | If the device was grounded to Earth ground, the scope grounded to Earth ground, and two probes used with the math function, then yes, the math result is valid. | |
| May 10, 2021 at 20:59 | answer | added | Cristobol Polychronopolis | timeline score: 3 | |
| May 10, 2021 at 20:55 | comment | added | Greg Woods | @Janka I've never even used the second set of leads on scope until now, but yes, using both channels and difference shows a perfect square wave with from +3.3V to -3.3V as I was expecting. But my desired output is those 2 pins without any direct reference to gnd. Will I get this? Is the scope maths a good enough test? | |
| May 10, 2021 at 20:55 | history | edited | Greg Woods | CC BY-SA 4.0 | added 490 characters in body |
| May 10, 2021 at 20:13 | answer | added | Elliot Alderson | timeline score: 1 | |
| May 10, 2021 at 19:52 | comment | added | Janka | If you connect the scope ground to something not ground, the scope is floating. Don't do that, it will pick up random noise. Use the difference input feature of your scope instead if you want to watch differential outputs. | |
| May 10, 2021 at 19:46 | answer | added | Transistor | timeline score: 8 | |
| May 10, 2021 at 19:18 | comment | added | Greg Woods | That is correct @CristobolPolychronopolis | |
| May 10, 2021 at 19:05 | comment | added | Cristobol Polychronopolis | Are you saying you're connecting the scope ground to the other toggling GPIO in the first trace? | |
| May 10, 2021 at 18:50 | history | asked | Greg Woods | CC BY-SA 4.0 |