Products: 
1 can detect ambient humidity and temperature 
sensor DHT11 2 
3 humidity measuring range: 20% to 95% (range 0 degrees -50 degrees) and humidity measurement error: + - 5% 
4 temperature measuring range: 0 degrees - 50 degrees Temperature measurement error: + - 2 degrees 
4 Operating voltage 3.3V-5V 
output in the form of digital output 5 
6 has a fixed bolt hole for easy installation 
7 small board PCB size: 3.2 cm * 1.4cm 
8 power indicator (red) 
9 Each weighs about 8g 
module interface specification (3-wire) 
1 external 3.3V-5V VCC 
2 GND External GND 
3 DO small board switch digital output interface connected to the microcontroller IO port