Timeline for PCB "Touch" Button
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Jan 23, 2017 at 16:00 | comment | added | Olin Lathrop | @Dmitry: I'm driving the something else high and low, then measuring the step change in the pads. Nothing is time-based other then allowing enough settling time to take readings. | |
| Jan 23, 2017 at 15:42 | comment | added | Dmitry Grigoryev | So you're driving the pads high and low, and measure some sort of charge/discharge rate using ADC? | |
| Jan 23, 2017 at 15:34 | comment | added | Olin Lathrop | @Dmitry: The Y axis shows the internal "how much the button is being touched" measure. It is derived from raw A/D values, but there are multiple A/D readings envolved, and there is significant processing on those readings. There was no attempt to keep them in particular units, since these values are relative to each other and arbitrarily entered thresholds. Very roughly they are in units of about 800 uV differential between reading. 350 means about 280 mV, but again, it's not really that simple. | |
| Jan 23, 2017 at 15:07 | comment | added | Dmitry Grigoryev |
What are the units of the Y axis in your plot? Are pads simply connected to the pins, or are there other components involved?
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| Jan 23, 2017 at 12:50 | history | answered | Olin Lathrop | CC BY-SA 3.0 |