Digital Input¶
Overview¶
A Digital Input reads an on/off (digital) state on a hardware pin — a switch,
button or relay contact. The input is on when the pin is shorted to signal
ground (sGND) and off when it is open. On reads as 1024, off as 0
(use Invert to swap them). In its other modes the same pin can instead measure
a property of a digital waveform: its duty cycle, frequency, or pulse time.
Use it for door/neutral switches, mode buttons, and simple signals you only need a
single value from. For richer frequency/speed/position work, prefer the
Frequency Input.
Prerequisites & hardware¶
- A contact or signal that shorts the pin to sGND to signal "on", and leaves it
open for "off". - On =
1024, off =0; use Invert if your wiring is the other way round. - Mechanical contacts bounce; plan to use the debounce timings below.
- For Duty/Frequency/Time modes the signal must be a clean repeating waveform.
Add it in the app¶
- Add a new input and choose Digital Input as the type.
- Select the pin the signal is wired to.
- Give it a clear alias (e.g.
Neutral Switch). - Choose the mode (plain on/off, or duty / frequency / time).
- Set Invert and the debounce timings as needed.
Settings reference¶
| Setting | Meaning | Unit | Range / values | Notes |
|---|---|---|---|---|
| Mode | What the pin reads | — |
Digital In, Duty, Frequency, Time
|
Digital In = plain on/off. The other modes measure that property of a digital waveform on the same pin. |
| Invert | Swaps on/off (1024 ↔ 0) |
— | on / off | By default on = pin shorted to sGND. Invert if the active state is the open one. |
| Enable filter | Turns on debounce filtering | — | on / off | Recommended for mechanical switches. The three timings below apply when on. |
| Delay | Debounce delay before a state change is accepted | ms | sint32 | A new level must be stable for this long before it is reported. |
| Hold | Minimum time a state is held once accepted | ms | sint32 | Stops rapid re-triggering; the state is kept at least this long. |
| Interspace | Minimum gap between transitions | ms | sint32 | Ignores transitions that arrive closer together than this. |
Debounce: Delay, Hold and Interspace work together to reject
contact bounce and electrical noise. Start with small values (a few ms) and
increase only if you still see false toggles.
Common settings¶
Digital Input also uses the shared settings — alias and pin. See
Common IO Settings.
Example — neutral switch¶
- Type Digital Input, alias
Neutral Switch, on the switch's pin. - Mode
Digital In. - The switch closes to sGND in neutral, so it reads on (1024) in neutral
directly — no invert needed (turn Invert on only if your wiring is opposite). -
Enable filter, set Delay
20, Hold30, Interspace10to
reject contact bounce.
Troubleshooting¶
-
State flickers / chatters: enable the filter and raise Delay /
Interspace. - Reads the opposite of what you expect: toggle Invert.
- Change is missed or too slow: Delay is too high — lower it.
-
Duty/Frequency/Time reads zero: confirm the mode matches the signal and that
the waveform actually toggles cleanly on that pin.
Related¶
- Frequency Input — frequency, speed, duty or pulse time.
-
Analog Switch Input — multi-position switch on one
analog pin. - Counter Input — count events/edges.
Updated by Adam Klama 1 day ago · 3 revisions