SEN55 Environmental Node
Measures PM1.0, PM2.5, PM4.0, PM10, VOC index, NOx index, temperature, and humidity — eight environmental parameters from one sensor module.
No shop listed yet
Say it to PAL
“How is the air in here?”
The code PAL writes
const pm = await p.read('qwiic-sen5x', 'pm2_5');
const voc = await p.read('qwiic-sen5x', 'voc_index');
const nox = await p.read('qwiic-sen5x', 'nox_index');
p.log(`PM2.5: ${pm} µg/m³, VOC: ${voc}, NOx: ${nox}`);“Tell me when the air quality gets poor.”
The code PAL writes
p.onSensorChange('qwiic-sen5x', 'pm2_5', (pm) => {
if (pm > 35) p.notify('Air quality unhealthy: PM2.5 = ' + pm + ' µg/m³');
});
await p.waitUntilStopped();When to pick it
The ultimate all-in-one air quality sensor. Use when you want PM, VOC, NOx, temperature, AND humidity from a single module. More expensive but replaces 3-4 individual sensors.
Good to know
- Internal fan needs ~30 seconds to stabilize after power-on.
- Requires 5V supply — check that your breakout has a regulator if using 3.3V Qwiic.
- NOx index takes ~12 hours of conditioning for reliable baselines.
- Fan produces audible hum — not silent like passive sensors.
- Large module (~40x50mm) — bigger than typical Qwiic breakouts.
About it
The Sensirion SEN55 is a comprehensive environmental sensor node combining particulate matter (PM1.0, PM2.5, PM4.0, PM10), VOC index, NOx index, temperature, and humidity in a single module. Uses laser scattering for PM, a MOX sensor for VOC/NOx, and dedicated elements for temp/humidity. Ideal for complete indoor air quality stations where one sensor covers everything. The SEN55 includes NOx sensing, which the SEN54 lacks.
Where to buy
No shop listed yet.
Facts
Tested
It is in our catalog, but nobody has checked it on a real board. It may not work yet. Its driver is written, but it has not been tested on hardware yet.
Current
65 mA
The catalog lists a typical draw of 65 mA for the SEN55, copied from the maker’s description and not measured by Palpable.
Board size
52.95 × 22.3 mm
The SEN55 board measures 52.95 × 22.3 mm and stands 43.56 mm tall with its parts. It has no mounting holes. These dimensions are from the maker’s mechanical drawing.
Chip
SEN55
Its sensor is the Sensirion SEN55.
Free to reuse
Every fact here is open data under CC BY 4.0. Copy it into your own docs or code, and credit Palpable. Download it
This record was last changed on October 6, 2026.