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 2: The Schematic Diagram
Step 3: Lead to the power supply line and GND
Step 4: The connection of LCD1602
Step 5: The connection of buzzer module
Step 6: Place the LED
Step 7: The connection of switches and limited-current 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 8: The demo diagram of experiment effect
Step 9: Video