Wireless CO₂ sensor beacon

Maintenance-free operation with a single coin-cell battery for more than a year

CO₂ Sensors

This is an introduction to the reference design of a modular "CO₂ Sensor Beacon" that can be operated with a single coin-cell battery using a CO₂ sensor Senseair Sunrise.

By using the application note, schematic, BOM, Gerber files, receiver software, etc., modular designs can be advanced quickly.

A compactly constructed IoT gas sensor network

CO₂ sensor Senseair Sunrise and the temperature/humidity sensor data are transmitted using Bluetooth® Low Energy transmitter IC AK1595A . With a transmission period of 15 minutes, the average current consumption of the entire sensor beacon is only 19[μA], so one coin-cell battery can operate for more than a year.

Its compact size (25 x 45 x t22[mm]) provides high flexibility in placement. CO₂ Sensor Beacon is the optimal sensor node for building IoT sensor networks. In addition, up to eight sensor data can be acquired simultaneously by using the receiver software.

* Bluetooth^® is a registered trademark of Bluetooth SIG, Inc.

A compactly constructed IoT gas sensor network

Compact functions required for wireless air quality sensing

One coin-cell battery provides at least one year of maintenance-free operation
Size 25 x 45 x t22 [mm]
Accuracy
- CO₂ sensor: ± (30 ppm + 3 % of reading)
- Temperature sensor: ± 0.2 ℃
- Humidity sensor: ± 2 %RH
Simple power supply circuit configuration
UART communication (Modbus) enables user to adjust the measurement cycle and other parameters.

Applications

Wireless CO₂ sensor network for proper ventilation in schools, restaurants and offices
Low-power indoor air quality (IAQ) monitoring (e.g., portable IAQ monitoring)
Automation of air-conditioning systems (HVAC: Heating, Ventilation, and Air Conditioning)
Smart agriculture and livestock industry that do not require battery replacement