Lesson 15--Microduino "Make sense of warm cup circuit"

Objective Last lesson introduced how to use LM35D, this lesson will show you how to make a analog thermal cup combined with Microduino. Equipment Microduino-Core Microduino-FT232R Other hardware equipment Breadboard Jumper one box Breadboard one piece LM35D temperature sensor one RGB LED one 450Ω resistor one Experimental schematic LM35's connection doesn't change, just add a common anode RGB LED. Program void setup() { Serial.begin(115200); //Set hte baud rate as 115200 for(int i=2;i<5;i++) //Set LED output { pinMode(i, OUTPUT); } } void loop() { int n = analogRead(A0); //Read voltage value from A0 port float temp = n * (5.0 / 1023.0*100); //Use a float variable to save temperature value which was calculated from voltage. if (temp<21) //Low temperature setting, and led display { digitalWrite(4, HIGH); digitalWrite(3, HIGH); digitalWrite(2, LOW); } else if (temp>=21 && temp<=23) //Middle temperature setting, && means "and" operation { digitalWrite(4, HIGH); digitalWrite(3, LOW); digitalWrite(2, HIGH); } else if (temp>23) //High temperature setting { digitalWrite(4, LOW); digitalWrite(3, HIGH); digitalWrite(2, HIGH); } Serial.println(temp); //Output the temperature from serial port delay(1000); //Wait for 1s and refresh the data } Result The temperature is set to low temperature, middle temperature and high temperature three range. When the temperature in the low temperature zone, RGB display a green light, blue light display in the middle temperature zone,and high temperature red light. Simulates a temperature sensing cup. Video