Sensor Reference
Six channels, in detail.
Each channel reads through a 16-bit ADS1115 ADC with programmable gain, factory-calibrated against standard reference solutions. Recalibrate in the field with standard buffers. Here is what each one measures, and why it matters.
A0 · BNC
pH
Acid or base. Drifts before the fish show stress, before a treatment batch goes off-spec.
Range0 – 14 pH
Accuracy±0.02 pH
ProbeIndustrial BNC electrode
CompensationAutomatic (ATC)
A1 · BNC
TDS / Conductivity
Dissolved salts and minerals. Tells you whether the water is concentrating or holding steady.
Range0 – 1000 ppm
Accuracy±2% full-scale
ProbeConductivity, dual-mode
ModeAuto-ranging
A2 · Analog
Turbidity
Cloudiness. The first sign of a bloom starting or sediment getting stirred up.
Range0 – 3000 NTU
MethodIR scatter, 850 nm
ProbeNephelometric
DetectsSuspended solids
A3 · BNC
ORP
Oxidation-reduction potential. Whether your disinfection is actually doing its job.
Range±2000 mV
Accuracy±5 mV
ProbePlatinum-tip electrode
UseChlorine validation
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.
ConstellationGPS + GLONASS
Accuracy2.5 m CEP
Moduleu-blox GNSS
TimingPPS sync