jarczyslaw/hysteresisregulator-arduino

HysteresisRegulator-Arduino

Intro

It's just a simple temperature regulator made with Arduino (I used Leonardo board but it should work also with Uno and others). It uses two-state controller with hysteresis to steer relay's output and popular DS18B20 sensor to measure temperature.

This is a Visual Micro project which is far better than Arduino IDE.

There is also control panel made in WPF to read and write data from board: HysteresisRegulator-WPF

Features

A short list of project features:

• control loop with relay controller (with hysteresis)
• customizable parameters: set point, hysteresis width, thermometer resolution
• settings are stored in EEPROM
• uses Modbus protocol to set regulator parameters and to show current devices states
• Leonardo has 2 serials, main Serial is used by Modbus communication, the second one for debugging purposes
• additional input for device's settings reset

Schematic

As you can see, there is only a few elements:

• LED on port 13 which indicates iiterations of control loop
• debug LED which toggles when debug data is sent through serial port (2s interval)
• control LED which indicates current output state. There should be relay circuit to control heater
• DS18B20 thermometer

Libraries used

Libraries that was used in this projects:

• EEPROMex
• Modbus Library for Arduino
• DS18B20 (digital temperature sensor) and Arduino