PTH100 Sensor Breakout
The PTHSonde's pressure, temperature, and humidity suite as a research-grade I²C breakout — Qwiic plug-and-play, 3.3–16 V input, flown on balloons, drones, and aircraft.
Docs & downloads
Overview
The PTH100 is a research-grade breakout board that measures pressure, temperature, and humidity — the same sensing suite that flies in the PTHSonde. A fast-response thermistor is paired with a 12-bit ADC-to-I²C converter, so every channel reads over a single I²C bus at 3.3 V logic.
A built-in regulator accepts 3.3–16 V input and dual Qwiic connectors make it plug-and-play with most microcontrollers. The thermistor is calibrated with a Steinhart–Hart fit over the atmospheric range (−60 to +40 °C). The board has been deployed on surface instrumentation, high-altitude balloons, drones, mobile mesonets, and aircraft systems.
In the box
- PTH100 sensor breakout with fitted fast-response thermistor
Highlights
Why it's different
Three channels, one bus
Pressure, temperature, and humidity all read over I²C — the thermistor's ADC converter puts true air temperature on the same bus.
Qwiic plug-and-play
Dual Qwiic connectors chain the PTH100 into any 3.3 V I²C setup with no soldering; a header breakout is there when you want pins.
Flies on anything
3.3–16 V input and a calibrated −60 °C range: proven on balloons, drones, mobile mesonets, aircraft, and surface stations.
Specifications
The numbers behind it
Measurement performance
| Barometric pressure | 10–1200 hPa · ±1.5 hPa · 0.01 hPa |
| Air temperature (fast-response thermistor) | −70 to +50 °C · ±0.3 °C · 0.01 °C |
| Relative humidity | 0–100 %RH · ±1.8 %RH · 0.1 %RH |
| Thermistor calibration | Steinhart–Hart fit, −60 to +40 °C |
Interface & power
| Bus | I²C @ 3.3 V logic |
| Addresses | 0x77 pressure · 0x4D ADC · 0x44 humidity |
| ADC | 12-bit ADC-to-I²C (thermistor channel) |
| Power input | VIN 3.3–16 V (regulated) · Qwiic 3.3 V |
| Connectors | 2× Qwiic + 0.1" header |
| Dimensions | 1.84 × 0.94 in (35.6 × 23.9 mm) |
Complete the kit
Goes well with
PTHSonde
A complete, reusable radiosonde system — pressure, temperature, humidity, wind, and GPS, streamed to a desktop ground station with a full sounding analysis.
PTHSonde Ground Station
The receiving end of the PTHSonde link — a 915 MHz LoRa receiver that decodes telemetry in real time and streams it to the desktop app over USB.
Ground Station Software
The free PTHSonde ground-station app — a live Skew-T workstation with time-series telemetry, full SPC sounding analysis, a GPS map with GFS landing prediction, a balloon fill calculator, and link health.
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Put the PTH100 Sensor Breakout to work
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