Arduino DHT22 LCD Monitor Circuit

Arduino DHT22 LCD Monitor

An Arduino temperature and humidity monitor commonly combines a DHT22 sensor with an I2C display. This schematic shows the DHT22 data line and its pull-up resistor, along with the display’s two-wire SDA and SCL bus. All modules share the same regulated 5 V supply and ground. In code, read the sensor at its supported interval and update the display with the latest values. Check the I2C address of the display before uploading the sketch, because similar modules can use different addresses. For longer sensor cables or noisier environments, use good grounding and follow the sensor manufacturer’s supply decoupling guidance. Label the selected Arduino pins in the project notes.

Type Circuit schematicStandard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitUpdated 9/24/2026

The request

“Draw an Arduino Uno circuit with a DHT22 sensor and 10 kΩ pull-up resistor, plus a 16x2 I2C LCD connected on SDA and SCL, powered from 5 V.”

Then tryAdd a pushbutton for display mode.Change the LCD label to OLED I2C display.

What is in this drawing

Read the decisions behind it.

01Sensor bus

Add the required data pull-up resistor.

02Display bus

Use SDA and SCL for the I2C display.

03Supply

Decouple the shared 5 V rail.

Use for a simple Arduino temperature and humidity monitor.

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FAQ

Common questions

Why does the DHT22 need a pull-up?

Its single-wire data line needs a resistor to hold the line high when no device is actively pulling it low.

What pins does I2C use?

I2C uses SDA for data and SCL for clock, connected to the board’s corresponding pins.

Can the display and sensor share 5 V?

Yes, provided the supply can safely provide their combined current and all grounds are connected.