A tiny, logger-friendly breakout that exposes the HTU31V humidity/temperature sensor as two buffered analog voltages—one pin for %RH and one for °C. No I²C required. The outputs are ratiometric to VDD and update about every 250 ms.

Many dataloggers, PLCs, and lab DAQs prefer simple voltage inputs. This board gives you HTU31-class accuracy with a 4-wire hookup: GND | RH | T | VCC. It drops into Campbell Scientific CR1000X/NI/PLC/Keysight analog inputs or MCU ADCs—no libraries, no bus wiring.

• Accuracy (sensor): ±2 %RH (typ), ±0.2 °C (typ); resolution: 0.01 %RH / 0.016 °C; RH response: ~3 s @ 1 m·s⁻¹; Temp response: ~10 s. Long-term drift: <0.1 %RH/yr, 0.04 °C/yr.

• Ratiometric analog outputs with on-chip buffer (±200 µA drive, ≤5 nF load).

• Low power: 161 µA typ (3–5.5 V supply).

• Robustness: –40…+125 °C, 0–100 %RH operating; ESD: HBM ±8 kV, CDM 750 V.

Compatibility & wiring

Works with CR1000X/NI/PLC analog inputs and MCU ADCs (≥100 kΩ input impedance ideal).

Use shielded cable for long runs; tie shield to GND at your logger.

Place the board where it sees ambient air; avoid direct condensation.

In the box

1 Piece EM-HTV-A2 board (assembled & tested)

Quick-start link (pinout, wiring and formulas)

Options (message me)

0–3.3 V variant, alternate temp span, conformal coating, pre-installed terminal block, or pigtail cable.