Timeline for Dealing with a Signal Source
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 9, 2020 at 9:55 | vote | accept | David Wisniewski | ||
| Oct 9, 2020 at 18:38 | |||||
| Oct 9, 2020 at 9:45 | comment | added | David Wisniewski | This is correct but utilizing the voltage divider is quite difficult in this scenario. | |
| Oct 7, 2020 at 17:37 | vote | accept | David Wisniewski | ||
| Oct 9, 2020 at 9:43 | |||||
| Oct 7, 2020 at 15:27 | comment | added | Majenko | Yes, but it's not an actively valid reading that is being driven by the rest of the circuit - just a "stop it floating" nothingness. | |
| Oct 7, 2020 at 15:14 | comment | added | Edgar Bonet | @Majenko: "nothing" is a valid reading. | |
| Oct 7, 2020 at 15:09 | comment | added | Majenko | @EdgarBonet The 1M is just a float-prevention pulldown. By having it so high it prevents the input floating with no buttons pressed and at the same time has little effect on the readings. Worst case the output impedance with Button 1 pressed would be 799.36Ω. With nothing pressed there's no output to have an impedance. Just ground through a resistor. Yes, it may slow down the transition from a valid reading to nothing, but that's not a problem. | |
| Oct 7, 2020 at 12:46 | comment | added | Edgar Bonet | Re "1M": Note that, on the Uno, the ADC is specified for a source output impedance no larger than 10 kΩ. | |
| Oct 7, 2020 at 12:37 | comment | added | DataFiddler | R1 ... R5 can have different values, which might spread the ranges per button more evenly | |
| Oct 7, 2020 at 12:28 | history | edited | Siddharth Kothari | CC BY-SA 4.0 |
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| Oct 7, 2020 at 12:22 | history | answered | Siddharth Kothari | CC BY-SA 4.0 |