Datasheet
The datasheet, in full.
Most monitors hide the electronics behind a brochure. Here is ours in full: Pi Zero 2W compute, 16-bit ADC, LoRa radio, power, and I/O — every connector, voltage, and tolerance.
Compute
ProcessorBCM2710A1 Quad Cortex‑A53
RAM512 MB LPDDR2
StoragemicroSD + SQLite WAL
OSRaspberry Pi OS Lite
Form FactorCarrier board, 120 × 105 mm, stacks on the Pi Zero 2W 40-pin header
Host BoardsRaspberry Pi Zero 2W · Arduino UNO Q / VENTUNO Q (digital-first)
Radio
TransceiverSemtech SX1262
Frequency915 MHz (US) / 868 MHz (EU)
RangeLoRaWAN US915 — range depends on gateway and terrain
ProtocolLoRaWAN 1.0.3 Class A
PayloadCayenne LPP
AntennaSMA 50 Ω / ¼‑wave whip
Power & I/O
Input Voltage24 V DC, 2 A minimum
Connector2-pos 5.08 mm screw terminal
RelaysFour outputs — switch site equipment through installer-supplied gear
ExpansionI²C · 3.3 V · JST‑XH
EnclosureOptional enclosure; ingress rating per the enclosure supplier’s datasheet
Sensing
Analog channels3 (pH, TDS, turbidity) via 16-bit ADS1115 · temperature on 1-Wire
Digital expansionRS485 Modbus — chlorine, EC/salinity, digital ORP (Honde probes)
ADCADS1115 16-bit · 4‑ch
Sample interval60 s (cloud-configurable 5–3600 s) · Wi-Fi store-and-forward
CalibrationpH, TDS and turbidity calibrated in the field with standard buffers and the guided wizard; temperature factory calibrated
Per-channel ranges, accuracy, probe types, and calibration live on the sensor reference.
See all channelsInstalling or servicing a unit? The full installer manual — first-boot setup, wiring, probe calibration, troubleshooting — is available digitally, no printed copy needed.
Open the installer manualPulling wire to the unit? Check each run against the manual before you cut it.
WQM-1 wiring calculator