User Manual

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Lesson 34 Thermostatic Water Tank System
Introduction
In this lesson, we will use a Rotary Encoder module, an Analog Temperature Sensor module,
a Relay module, a Button module and an I2C LCD1602 to build a Thermostatic Water Tank
system. The tank can be used in various situations, such as in the test department of medical
organizations and colleges, scientific research, chemical industry, printing and dyeing
industry to distil, dry, inspissate and heat chemical medicines and cultivate biological
products in a constant temperature, as well as to boil and disinfect equipment.
Components
- 1 * SunFounder Uno board
- 1 * USB data cable
- 1 * Rotary Encoder module
- 1 * Analog Temperature Sensor module
- 1 * LCD1602
- 1 * Relay module
- 1 * Button module
- Several jumper wires
Experimental Principle
In this experiment, we use a thermistor temperature sensor and an LCD to sense and display
both the current temperature and the set temperature. A rotary encoder is used to change
the set temperature. When the measured temperature value is lower than the set value, the
relay is activated. Relays are old-fashioned electromagnetic components that activate a
mechanical switch when a current flows through its coil of wire. They can switch high currents
and voltages, making them suitable for controlling main equipment.
Experimental Procedures
Step 1: Build the circuit
LCD1602 Connection: connect pin RS to digital pin 12; R/W to GND; E to digital pin 11; D4~D7
to digital pin 10, 9, 8, and 7; VSS to GND; VDD to 5V; A to 3.3V; K to GND
Button Connection: connect pin S to digital pin 5, pin - to GND, and + to 5V
Analog-temperature sensor Connection: connect pin S to analog port A0, - to GND, and +
to 5V
Relay Connection: connect pin S to digital pin 6, pin - to GND, and + to 5V
Rotary Encoder Connection: connect pin CLK to digital pin 2, DT to digital pin 3, SW to digital
pin 4, pin - to GND, and + to 5V
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