LPN CM-4 Sensor - Temperature & Humidity Sensor
The comtac LPN CM-4 SENSOR has a built-in temperature sensor and a humidity sensor that records temperature and moisture at programmable intervals. The collected data is sent over the LoRaWAN® network for further processing.
About this device
The comtac LPN CM-4 SENSOR has a built-in temperature sensor and a humidity sensor that records temperature and moisture at programmable intervals. The collected data is sent over the LoRaWAN® network for further processing.
The LPN CM-4 Sensor - Temperature & Humidity Sensor supports 1 regional frequency plan and operates as a Class A LoRaWAN device. A payload codec is published in the repository, so uplinks are decoded automatically when you onboard it to The Things Stack.
Key features
- Sensors: humidity, temperature, battery.
- LoRa Alliance certified, verified interoperability with The Things Stack and other LoRaWAN network servers.
- Payload codec included, uplink decoder ready for one-click activation.
- 1 frequency plan supported: EU863-870.
- Battery powered (LiMn02 1.5Ah AA battery), user replaceable.
Vendor
At a glance
Hardware specifications
| Model ID | lpn-cm4 |
| Dimensions | 90 × 128 × 53 mm |
| Weight | 165 g |
| IP rating | IP65 |
| Operating temperature | -20 °C to 80 °C |
| Relative humidity | 0% to 0.95% |
| Power | Battery — LiMn02 1.5Ah AA battery, replaceable |
Sensors & capabilities
Certifications & compliance
| Safety | 62368-1:2014 — IEC |
| Radio equipment | 301 489-1 (2.2.3) — ETSI |
| Radio equipment | 301 489-3 (2.1.1) — ETSI |
| Radio equipment | 300 220-2 (3.2.1) — ETSI |
Standards
Network profiles
Capabilities are defined per firmware version and frequency plan, exactly as published in the repository.
Firmware V01.02
| Frequency plan | MAC | Reg. params | Class | Join | Max EIRP | Certified |
| EU863-870 | 1.0.2 | RP001-1.0.2-RevB | A | OTAA | 16 dBm | ✓ Yes |
Frequency plan coverage
Live decoder playground
Decode any hex payload client-side with the device's published codec, the exact code The Things Stack runs.
// pick an example or paste a payload, then Decode
Example uplink from The Things Stack
The full JSON message your application receives via MQTT or webhook when this device sends the payload above, raw bytes, decoded fields and radio metadata included.
// decode a payload above to see the full envelope
Codec source
// loading codec…
Add to The Things Stack
Manual setup
Create an application
In The Things Stack console, go to Applications → Create application and pick a unique application ID.
Register an end device
Choose From the LoRaWAN Device Repository and search for “LPN CM-4 Sensor - Temperature & Humidity Sensor”. Select your firmware version and frequency plan.
Enter device credentials
Provide the DevEUI, JoinEUI and AppKey printed on the device label or QR code.
Power on & verify uplinks
Within a few minutes you'll see the join request and decoded uplinks in the Live data tab.