Handheld Water Temperature Monitoring System Based on Arduino ATMEGA2560

By on August 5, 2015

Web site:


Project Summary:

ICStation team has made this project about Handheld Water Temperature Monitoring System.It works under DC5V voltage. It can detect water temperature through DS18B20 temperature detection module. When the detection temperature is higher than the setting ceiling temperature, or lower than the minimum temperature, the system buzzer will give an alarm and LED light will flash. The system’s manufacture operation is simple and cost is cheap, which is suitable for temperature detection in factories and new agricultural greenhouses.

Full Project:


1) When the starting-up hardware initializes, 1602 LCD display module will display the interface which has been setted
2) When the temperature detected by DS18B20 probe is between the minimum and the maximum temperature, buzzer will not give an alarm and LED light won’t flash.

3) When the temperature is higher than the maximum or lower than the minimum, buzzer will alarm and LED will flash.

4)Set the maximum and minimum temperature by three buttons.

Step 1: Lead to the power supply line and GND

Plug +5V power supply and GND from ICSTATION MEGA development board into the bread board. The red bread wire is used as power line, and black bread wire is used as ground wire.

Step 2: The connection of LCD1602

1.Place the 1602 LCD display module on the bread board.

2.According to the schematic diagram, connect the 1602 LCD display module to ICSTATION MEGA development board

Step 3: The connection of buzzer module

Connect the pin 1 of buzzer to the anode, pin 3 to the cathode, pin 2 of the buzzer to pin 10 of ICSTATION MEGA development board

Step 4: Place the LED

Step 5: The connection of switches and limited-current resistance

1. Place the switches and 1K current-limiting resistance

2.Connect Pin 1 of the three switches to +5V, Pin 3 to GND. And connect Pin2 of add switch to A0,Pin2 of points decrease switch to A1, Pin2 of selector switch to A2.

Step 6: The demo diagram of experiment effect

Step 7: Video

Circuit diagram:

Bill of Materials:

1.1 x ICStation ATMEGA2560 Mega2560 R3 Board Compatible Arduino

2.1 x 830 Point Solderless PCB Bread Board MB-102 Test DIY

3.1 x Active Buzzer Module for Arduino

4.1 x 65pcs Breadboard Plug Wire Cable Tire

5.3 x 12X12X5mm Tact Switches 4 Legs

6.5 x 100pcs 1K ohm 1/4W 1% Accuracy Metal Film Resistor

7.1 x +5VDC power supply

8.1 x 1602A HD44780 Character LCD Display Module LCM Blue Backlight

9.1 x Waterproof Digital Thermal Probe Sensor DS18B20

10.1 x 1K 202 Blue White Resistance Adjustable Resistor

Software & Code Snippets:

Code for reference:



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