DHT11/DHT22を配線する

A DHT sensor measures both temperature and humidity in one tiny package. It is the friendliest way to give your project a sense of climate. 🌡️

The DHT11 is cheap and good enough for hobby projects. The DHT22 costs a bit more but reads a wider range with better accuracy.

What makes DHT lovely is its single data pin. One wire carries both readings to your board, so wiring stays simple.

A bare DHT has three useful pins: VCC for power, GND for ground, and DATA for the signal. A fourth pin is usually unused.

Connect VCC to the 5V pin on your Arduino and GND to a ground pin. Get this right first, or the sensor stays silent.

Run the DATA pin to any digital pin you like, such as pin 2. You will name this exact pin later in your code.

The data line needs a pull-up resistor, about 10k ohms, between DATA and VCC. It keeps the idle signal clean and steady.

Without that resistor, the data line can float and report scrambled values. The pull-up gives the line a reliable resting voltage.

Many DHT modules come on a small board with the resistor already soldered on. Then you only wire three pins and skip the resistor.

Always check the pin labels printed on your sensor. Swapping VCC and GND can overheat the part, so look before you power up.

Trace each wire one more time: power, ground, and data to the right digital pin. A calm check now saves confusing readings later.

You are wiring a bare DHT11. What component does its data line need to stay reliable?

You met the DHT family, wired VCC, GND, and a data pin, and added a 10k pull-up so the signal stays clean and trustworthy. 🎉