Hardware

Specifications, with their source.

Every row says where the figure comes from, so you can tell a promise from a datasheet from a measurement.

Manufacturer as published by the sensor maker, not verified by usOur design what the system is built to doTo be confirmed undecided or untested

Capacity per controller

Item	Capacity	Status
Nutrient dosing channels	8	In development
pH dosing channels	2 (up and down)	In development
Air-sensor jacks	4 on one RS-485 bus; several sensors can share a bus	Working in prototype
Water-sensor jacks	6 on a second RS-485 bus; isolated segments in design	In development
Sensor channels in the app	15	Working in prototype
Equipment outputs	12 (via an external relay module)	In development
Reservoirs monitored	2: main and top-up	Planned
Rooms	1 per controller; an account can hold several	Working in prototype

Measurement	Model	Range	Stated accuracy	Upkeep	Status
Air temperature and humidity	DFRobot SEN0438	−40 to 80 °C, 0 to 100 % RH	±0.5 °C, ±3 % RH typical	None routine	Working in prototype
CO₂	DFRobot SEN0659	To be confirmed	To be confirmed	Weekly fresh-air exposure for auto-baseline	Working in prototype
Light (PAR)	DFRobot SEN0641	400 to 700 nm	Cosine error up to 10 %, drift up to 2 % per year	Conversion factor per fixture	Working in prototype
pH	DFRobot SEN0708	0 to 14	±0.15 pH	Two-point buffer calibration	In development
EC	DFRobot SEN0707	0 to 20 mS/cm	±2 % full scale	Standard solution calibration	In development
Dissolved oxygen	DFRobot SEN0680	0 to 20 mg/L	±3 % full scale	Film replaced yearly	In development
ORP	DFRobot SEN0709	±2000 mV	±5 mV	Buffer calibration	In development
Water temperature	DS18B20 probe	−55 to 125 °C	±0.5 °C	None	Planned
Tank level	RS-485 ultrasonic	0.2 to 4.5 m	±0.5 % full scale	Tank height setup	Planned

All accuracy figures are the manufacturers' published values. Calibration and replacement intervals are to be confirmed.

Item	Value	Source
Controller board	230 × 105 mm	Our design
Controller layout	10 pump jacks along one long side; 4 air and 6 water jacks along the other; 2 USB-C ports at one end; the power input and the WiFi module at the other	Our design
Pump driver board	30 × 50 mm: RJ45 at one end, motor and encoder connector at the other, motor supply on the side	Our design
Cases	Planned for the controller and for each pump driver, as in the pictures. Size, material and rating not fixed	To be confirmed
Controller supply	DC, voltage not fixed	To be confirmed
Pump motor supply	12 V or 24 V DC	To be confirmed
Power consumption	Not measured	To be confirmed
Network	WiFi 2.4 GHz; the ESP32-C5 also has 5 GHz, not yet tested	Our design
Sensor and pump connections	RJ45 sockets carrying power and RS-485 or CAN	Our design
Case rating and certification	None yet	To be confirmed

The RJ45 sockets are not network ports. They carry power and control signals. Never connect them to a router, switch or computer.

Calibrate pH, EC and ORP probes with standard solutions. The interval is to be confirmed.
Replace the dissolved-oxygen film yearly (manufacturer figure).
Let the CO₂ sensor see fresh air weekly so its automatic baseline stays correct.
Replace pump tubing at an interval that depends on the pump model, not yet chosen.