Constant Value Input » History » Revision 4
Revision 3 (Adam Klama, 06/21/2026 03:07 PM) → Revision 4/5 (Adam Klama, 06/21/2026 03:07 PM)
# Constant Value Input
## Overview
A **Constant Value Input** simply outputs a single, fixed number. It has no
sensor — its value never changes on its own, but you can **tune it**
from the app. Use it as an adjustable constant or threshold that other IO can
reference by alias: a limit fed into a [Compare Input](Compare_Input), a fixed
operand for a [Math / Divide Input](Math_Divide_Input), or a calibration
offset used by a map.
## Prerequisites & hardware
None. This is a logical input with no source inputs — it
stands on its own. You only need somewhere to use it: another input, output or
map that will reference it by **alias**.
## Add it in the app
1. Add a new input and choose **Constant Value Input** as the type.
2. Give it a clear **alias** (e.g. `Shift Pressure Limit`).
3. Enter the **value**.
## Settings reference
| Setting | Meaning | Unit | Range / values | Notes |
|---|---|---|---|---|
| **Value** | The fixed value this input reports | — (the value referencing IO expect) | sint32 | Can be negative. Change it any time to retune the constant; everything referencing this input picks up the new value. |
## Common settings
Constant Value Input also uses the shared setting — alias. See [Common IO Settings](Common_IO_Settings).
## Example — a tunable shift-pressure limit
1. Type **Constant Value Input**, alias `Shift Pressure Limit`.
2. Set **Value** to `850` (the limit in your pressure units).
3. In a [Compare Input](Compare_Input), compare your measured pressure against
`Shift Pressure Limit`. To raise the limit later, edit this one value rather
than every place it is used.
## Troubleshooting
- **The value never updates downstream:** confirm the other IO references this
input by its **alias**, not a hard-coded number.
- **Wrong magnitude:** make sure the value is in the same units/scaling the
consumer expects (e.g. if a map works in tenths, enter `850` for 85.0).
## Related
- [Compare Input](Compare_Input) — compare a signal against a value or constant.
- [Math / Divide Input](Math_Input) — combine inputs, often with a constant.