Sensor Reference
Four base channels, in detail.
pH, TDS and turbidity read through a 16-bit ADS1115 ADC with programmable gain; temperature is on 1-Wire. pH, TDS and turbidity are calibrated in the field with standard buffers and the guided wizard; temperature is factory calibrated. Here is what each one measures, and why it matters.
A2 · BNC
pH
Acid or base. Drifts before the fish show stress, before a treatment batch goes off-spec.
Range0 – 14 pH
ProbeIndustrial BNC electrode
AccuracyProbe datasheet; system accuracy not yet characterised
CompensationAutomatic (ATC)
A0 · JST-XH
TDS
Dissolved salts and minerals. Tells you whether the water is concentrating or holding steady.
Range0 – 1000 ppm
ProbeConductivity, dual-mode
AccuracyProbe datasheet; system accuracy not yet characterised
ModeAuto-ranging
A1 · JST-XH
Turbidity
Cloudiness. The first sign of a bloom starting or sediment getting stirred up.
Range0 – 3000 NTU
MethodIR scatter, 850 nm
ProbeNephelometric
DetectsSuspended solids
GPIO · 1-Wire
Temperature
Drives everything else. The reference the pH and TDS readings compensate against.
Range−5 – 85 °C
Accuracy±0.5 °C
ProbeWaterproof DS18B20
HousingStainless steel
UART · NMEA
GPS
Where the reading came from. Geo-stamps every batch — built for mobile and multi-site work.
Moduleu-blox MAX-M10S GNSS
OutputGeo-stamps readings
InterfaceUART · NMEA
TimingPPS sync