View source for Lesson 15--Microduino "Make sense of warm cup circuit"

{{Language|第十五课--Microduino_制作感温杯电路}}
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==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==
[[File:lesson15-schematic.jpg|600px|center|thumb]]
LM35's connection doesn't change, just add a common anode RGB LED.

==Program==
<source lang="cpp">
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
}
</source>
==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==
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