====== Indoor Air Quality (IAQ) ====== The RW/RLW line of IAQ sensors is designed for **air quality measurements** in houses, schools, office buildings, restaurants, factory halls and other similar objects. All sensors are placed in a handy white plastic box (IP20 protection) designed for on-wall installation by attaching it into a suitable wiring box (such as KU68). **Four variants** in total are offered, featuring sensors of temperature, humidity, light intensity, barometric pressure and VOC (volatile organic compound) concentration. **THC** models are able to **measure CO₂** concentration with the indication LED changing its colour from green to red (green = low concentration, red = high concentration). On **TH** models the LED then serve for the indication of air quality index. The sensors feature **measuring of up to six quantities** in a single compact package. RLW variants have the same functionality as RW models, but additionally feature the **LoRaWAN** communication interface. All models are provided with **RS485** and **Wi-Fi** interfaces. Product datasheets, technical documentation and up-to-date firmware for indoor air quality sensors are available [[en:files:products:05-sensors:iaq|on this link]]. ==== Complete overview of individual variants: ==== {{ :en:hw:05-sensors:iaq-devices.png?direct |}} ===== Description of Unipi IAQ devices ===== The sensors are suitable for usage in offices, schools, commercial buildings, factory halls with internal *LoRa/Wi-Fi networks, but also for household applications. When combined with other technologies the sensors provide the option to maintain stable air quality, creating a comfortable environment for work or relaxation. //*LoRaWAN is available only for RLW-TH and RLW-THC variants// For more information about possible applications of Unipi IAQ sensors with LoRa interface, visit [[https://www.unipi.technology/case_study/integration-of-an-iot-indoor-air-quality-sensor-with-lora-communication-364|Integration of an IoT indoor air quality sensor with LoRa communication]] case study. ==== RW-TH ==== {{ :cs:hw:05-sensors:unipi-iaq-co2.png?direct&150|}} * **the most basic** IAQ variant * features sensors for measuring temperature, relative air humidity, light intensity, barometric pressure and VOC concentration * LED indication of air quality index * **does not contain** CO₂ sensor and LoRaWAN interface Examples of use: * measuring temperature and relative air humidity to provide data for HVAC regulation * using internal air quality data for regulation of ventilation and air recovery * controlling indoor artificial lights according to ambient light levels Possible applications: * when used with Unipi units: an element of **MaR systems** using the **Modbus RTU/TCP** protocol * usage within a third-party system through RS485 or Wi-Fi interface using a suitable communication protocol * individual use - communication through Wi-Fi with the option of web server access {{ :files:img_breakline.png?nolink |}} ==== RW-THC ==== {{ :cs:hw:05-sensors:unipi-iaq-co2.png?direct&150|}} * integrated **CO₂ sensor** and a LED indication of CO₂ concentration * features sensors for measuring temperature, relative air humidity, light intensity, barometric pressure, VOC concentration and CO₂ concentration * **does not contain** the LoRaWAN interface Examples of use: * measuring temperature and relative air humidity to provide data for HVAC regulation * using internal air quality data (enhanced by CO₂ concentration measurements) for the regulation of ventilation and air recovery * controlling indoor artificial lights according to ambient light levels Possible applications: * when used with Unipi units: an element of **MaR systems** using the **Modbus RTU/TCP** protocol * usage within a third-party system through RS485 or Wi-Fi interface using a suitable communication protocol * individual use - communication through Wi-Fi with the option of web server access {{ :files:img_breakline.png?nolink |}} ==== RLW-TH ==== {{ :cs:hw:05-sensors:unipi-iaq-co2.png?direct&150|}} * variant featuring **LoRaWAN** interface * features sensors for measuring temperature, relative air humidity, light intensity, barometric pressure and VOC concentration * LED indication of air quality index * **does not contain** CO₂ sensor and LoRaWAN interface Examples of use: * measuring temperature and relative air humidity to provide data for HVAC regulation * using internal air quality data for regulation of ventilation and air recovery * controlling indoor artificial lights according to ambient light levels Possible applications: * when used with Unipi units: an element of **MaR systems** using the **Modbus RTU/TCP** protocol * usage within a third-party system through RS485 or Wi-Fi interface using a suitable communication protocol * individual use - communication through Wi-Fi with the option of web server access * individual use - communication via LoRaWAN (up to 16 bytes of transmitted data, containing up to 10 values, with a user-configured interval (limited by the relevant legislation and/or service fees) {{ :files:img_breakline.png?nolink |}} ==== RLW-THC ==== {{ :cs:hw:05-sensors:unipi-iaq-co2.png?direct&150|}} * variant featuring the **LoRaWAN** interface * integrated **CO₂ sensor** and a LED indication of CO₂ concentration * features sensors for measuring temperature, relative air humidity, light intensity, barometric pressure, VOC concentration and CO₂ concentration Examples of use: * monitoring of internal air quality (enhanced by CO₂ concentration measurements) to provide data from controlling air recovery or ventilation control * measuring temperature and relative air humidity to control HVAC systems * controlling indoor lights according to the ambient light intensity Possible applications: * when used with Unipi units: an element of **MaR systems** using the **Modbus RTU/TCP** protocol * usage within a third-party system through RS485 or Wi-Fi interface using a suitable communication protocol * individual use - communication through Wi-Fi with the option of web server access * individual use - communication via LoRaWAN (up to 16 bytes of transmitted data, containing up to 10 values, with a user-configured interval (limited by the relevant legislation and/or service fees) {{ :files:img_breakline.png?nolink |}} ===== LoRa frame decoder code ===== Example of binary payload decoder. Function names are in accordance with ''The Things Network''.


function getBit(number, bitPosition) {
  return (number & (1 << bitPosition)) === 0 ? 0 : 1;
}
function Decoder(bytes, port) {
  // Decode an uplink message from a buffer
  // (array) of bytes to an object of fields.
  var decoded = {};
  if (getBit(bytes[0],0)) {
    decoded.temperature = ((bytes[2] << 8) | bytes[1]) / 100 - 100;
    decoded.relative_humidity = bytes[3] / 2.5;
  }
  if (getBit(bytes[0],1)) decoded.pressure = ((bytes[5] << 8) | bytes[4]) / 100 + 800;
  if (getBit(bytes[0],2)) {
    decoded.voc_index = ((bytes[7] << 8) | bytes[6]) & 0x01FF;
    decoded.voc_accuracy = ((bytes[7] << 8) | bytes[6]) >> 9 & 0x0003;
  }
  if (getBit(bytes[0],3)) decoded.ambient_light = Math.exp(bytes[8] / 20) - 1;
  if (getBit(bytes[0],4)) decoded.co2 = ((bytes[10] << 8) | bytes[9]);
  if (getBit(bytes[0],5)) {
    decoded.pm10 = (((bytes[13] << 16) | (bytes[12] << 8) | bytes[11]) >> 12) & 0x000FFF / 4;
    decoded.pm2_5 = ((bytes[13] << 16) | (bytes[12] << 8) | bytes[11]) & 0x000FFF / 4;
  }
  if (getBit(bytes[0],6)) {
    decoded.noise_duration = (bytes[14] / 2);
    decoded.noise_intensity = (bytes[15] / 5) + 25;
  }
  return decoded;
}

===== Further info ===== | en:files:products:05-sensors:iaq | Documentation and firmware for download | :en:files:unipi-kb-icon-os.png | | en:hw:05-sensors:iaq-eshop-redirect-hidden | Buy at Unipi e-shop | :files:unipi-kb-icon-shopping-cart-outline.png |