Purpose:
Allows user-defined mathematical expressions to process incoming sensor data.
🔧 Syntax (in user defined code)
F14,<formula>,<A_pos>,<B_pos>,<C_pos>,<D_pos><formula>: A math expression using placeholders (A, B, C, D, R, X, Y, Z)
<A_pos> to <D_pos>: Indexes referring to the values in the sensorString, starting after the timestamp
Placeholders
| Placeholder | Description |
|---|---|
A–D | Values from the sensorString |
R | Result from the previous F14 calculation |
X–Z | Internal counters (can be used or updated later) |
The result of each calculation is stored in R, which can be used in subsequent formulas.
Example
Configuration line:
F14,A*1,2,0,0,0Incoming sensor string:
2025/06/23 09:46:50,12453,0,22.3After skipping the timestamp:
- Index 0 →
12453 - Index 1 →
0 - Index 2 →
22.3
A = 22.3
Formula: A * 1
Result: R = 22.3
Notes
- Comma-separated
sensorStringvalues are indexed starting at 0 (after timestamp). - Only available in User-Defined Mode
- Avoid invalid math operations (e.g., division by zero).
- Useful for scaling, offsetting, combining, or converting raw values on-device.