# Four-channel nutrient dosing module

Canonical HTML: https://flavorotor.com/research/four-channel-dosing
Machine-readable index: https://flavorotor.com/research/data/chapters/index.json



Independent fluid channels, channel identity, mixing logic and the separation between dosing a stock solution and producing a plant sensory outcome.

In brief

Independent fluid channels, channel identity, mixing logic and the separation between dosing a stock solution and producing a plant sensory outcome.

**System integration.** Original pump-package CAD. [I03]

**Four independent fluid channels.** Original pump-package CAD. Channel assignment is recipe-defined and requires independent calibration. [I03]

## Explanation

Four pumps allow four liquids to be added independently. The channels control liquid volumes. They do not directly control sweetness, acidity or aroma.

## Architecture

The documented motor-control architecture uses STEP/DIR microstepping drivers of the A4988 class. Driver selection defines command generation and protection requirements; it does not determine pump volumetric accuracy. [R44]

 Stock 1–4 → Calibrated channel → Injection point → Mixing delay → Reservoir measurement

## Safe channel definition

 |
 Channel | Permitted role | Required metadata

 | 1 | water or defined stock | fluid ID, batch and density
 | 2 | nutrient stock A | full chemical composition and compatibility class
 | 3 | nutrient stock B | full chemical composition and compatibility class
 | 4 | correction or experimental stock | purpose, maximum dose and exclusion rules

 **Measurement rule**

A channel labelled K, N or Ca still changes multiple chemical and physiological variables. Any sensory outcome is established only by a controlled crop trial.

## Dose traceability

event_id, timestamp, system_id, recipe_id, recipe_version,
channel_id, fluid_id, fluid_batch, calibration_id,
requested_volume_mL, commanded_steps, speed_rpm, direction,
reservoir_volume_before_L, pH_before, EC_before, temperature_before,
mixing_delay_s, pH_after, EC_after, fault_state

## FlavoRotor design provenance

 The system-specific configuration on this page is traced to the supplied FlavoRotor engineering records. [I02] [I03]

## Module interior

**Module interior.** Original internal CAD image. It documents channel packaging; delivered volume and cross-channel isolation remain validation items. [I03]

## References

- [I02] FlavoRotor project team (2026). FlavoRotor v2.0 system architecture. *Internal engineering design report*.
- [I03] FlavoRotor project team (2026). FlavoRotor peristaltic pump technical record. *Internal engineering record*.
- [R44] Allegro MicroSystems (2010). A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection. *Official component documentation*.