User Manual

Table Of Contents

VMA345

V. 01 – 10/02/2020 3 ©Velleman nv

4. What is Arduino

Arduino

is an open-source prototyping platform based in easy-to-use hardware and software.

Arduino

boards are able to read inputs – light-on sensor, a finger on a button or a Twitter

message – and turn it into an output – activating of a motor, turning on an LED, publishing

something online. You can tell your board what to do by sending a set of instructions to the

microcontroller on the board. To do so, you use the Arduino programming language (based on

Wiring) and the Arduino

software IDE (based on Processing).

Surf to www.arduino.cc and www.arduino.org for more information.

5. Overview

General

The CM2302/DHT22 is a temperature and humidity composite sensor. It uses dedicated digital

module acquisition technology and temperature and humidity sensing technology to ensure

high reliability and excellent long-term stability. The sensor includes a capacitive wet sensor

and a high-precision NTC temperature sensor connected to a high-performance 8-bit

microcontroller, ensuring the product's excellent quality, fast response, anti-interference ability

and cost efficiency. Each sensor is being calibrated in a highly accurate humidity calibration

room.

Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger

range of temperature/humidity, but its larger and more expensive.

Applications

HVAC, dehumidifiers, testing and testing equipment, consumer products, automotive,

automatic control, data loggers, home appliances, humidity regulators, weather stations, and

other related humidity detection control.

Features

• ultra-low power consumption

• long transmission distance

• standard digital single bus output

• excellent long-term stability

• high-precision NTC

6. Connection VMA345 to a VMA100/Arduino

UNO

VMA100/Arduino

UNO

VMA345

VCC

GND

digital pin 2 (or other one)

DAT