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DHT11 temperature and humidity sensor modules.
The DHT11 is a staple in DIY electronics and smart home setups for measuring basic environmental data. The blue, grid-like plastic housing protects the internal sensing components while allowing air to flow through it.
Unlike the bare 4-pin DHT11 sensor component, these are pre-mounted on small breakout PCBs (printed circuit boards), which typically include a built-in pull-up resistor. This makes them much easier to plug directly into breadboards or microcontrollers.
Pinout Configuration
Because they are on breakout boards, they are streamlined down to 3 pins:
S (Signal / Out): The digital data pin that sends the temperature and humidity readings to your microcontroller.
+ (VCC): Power supply (typically 3.3\text{V} or 5\text{V}).
- (GND): Ground.
(Note: Depending on the manufacturer, the exact order of the pins can sometimes vary, so it's always a good idea to peek closely at the labels printed on the board, like the "S" and "-" visible on yours).
What they are great for
The DHT11 uses a capacitive humidity sensor and a thermistor to measure the surrounding air, spitting out a digital signal on the data pin. They are incredibly popular for:
Home automation systems (like tracking room climate via ESPHome/Home Assistant).
Weather stations.
Automatic fan or greenhouse control systems.
