![]() This also requires calibration against known sources. The sensor can’t tell which gasses it measures but it can be used to detect trends and for comparison. ![]() This is a group of hydrocarbon gasses including SMOG, butane (used for cooking) carbon monoxide (very toxic to humans) etc. Last but not least, the BME680 also measures volatile organic compound (VOC) gas. To calibrate the sensor, the current sea level pressure for the location must be set. With an accuracy of ± 1 hPa air pressure, it is also possible to measure altitude with an accuracy of ± 1 meter, since air pressure changes with height. In addition to temperature and humidity, the BME680 also measures air pressure. Compared to the DHT11, which has an accuracy of 5% humidity and 2.0 degrees Celcius, it’s a nice improvement. The BME680 has an accuracy of ± 3% humidity, ± 1.0 degrees Celcius. While looking for an alternative sensor to upgrade the DHT11 with, I stumbled upon the Adafruit BME680. Good indoor humidity lies between 40 and 60%. ![]() Humidity is also an important aspect of in-house climate quality. What I liked about the DHT11 is that it also measures humidity. I know there are cheaper and even simpler solutions possible to suit this scenario, but I want to keep my options open for the future. This is perfect for running a lightweight Python script to read the sensor, connect to the WiFi and send the readings to the main Pi. It has the same CPU as the original Pi but clocked at 1 GHz (single-core) with 512 Mb of RAM. In 2017, Raspberry released a wireless edition of their Pi Zero. For the individual rooms, I was looking for a more lightweight/wireless solution. ![]() Thanks to its 1.5 GHz quad-core ARM processor and 4 Gb of RAM it will have no issues running some docker containers with Grafana and my Java app. The powerful Pi 4 B is an ideal candidate to do this. So I needed a central place to gather the data and run my software and Grafana. I have a Synology NAS but I did not want to run anything on it for this project. I don’t want to rely on any cloud service and I want to have an independent system. So it is going to be a wireless set up mostly. My requirement is to measure at least the temperature per room without having a lot of cables all over the place. ![]()
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