Month: March 2024

It is very common to use human body detecting sensors – the infrared sensors in indoor security applications. The principle is that the detection element will detect the infrared radiation of the human body, and convert it into a weak voltage signal, which is amplified and output. In order to improve the detection sensitivity of […]

Temperature and humidity are also very common indicators in our daily lives, and I used the DHT11 digital temperature and humidity sensors on my Raspberry Pi. This is the wiring diagram of the DHT11 on the PiHAT, and we can see that the DHT11 is connected to pin 19 of the Raspberry PI, which can […]