Building a Modbus RTU Temperature & Humidity Sensor with Arduino Pro Micro and RS485 Transceiver Module
In this project, we'll guide you through creating an Modbus RTU temperature and humidity sensor using an Arduino Pro Micro, an RS485 transceiver, and an AM2301A sensor. This setup can be used in industrial environments, where Modbus RTU is a commonly used protocol for data acquisition and control, and where 24V power supplies are standard. We'll also use an L7805 voltage regulator to convert 24V to 5V for the Arduino and the sensor. Components You'll Need: Arduino Pro Micro (Atmega32U4) RS485 Transceiver Board AM2301A Temperature & Humidity Sensor L7805 Voltage Regulator (for 24V to 5V conversion) 24V DC Power Supply Resistors, Capacitors, Wires, Breadboard Step 1: Understanding the Components 1. Arduino Pro Micro The Arduino Pro Micro is a small board powered by an Atmega32U4 microcontroller. It's great for compact applications where space is limited. It has built-in USB, making it easy to program. 2. RS485 Transceiver (MAX485) RS485 is widely used in indust...