Pkj：Created page with "{{Language|第二十四课--Microduino 数码管温度计}} {| style="width: 800px;" |- | ==Objective== This tutorial will teach you how to use the DS18B20 temperature sensor ..."

2014-03-16T08:28:23Z

Created page with "{{Language|第二十四课--Microduino 数码管温度计}} {| style="width: 800px;" |- | ==Objective== This tutorial will teach you how to use the DS18B20 temperature sensor ..."

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{{Language|第二十四课--Microduino 数码管温度计}}
{| style="width: 800px;"
|-
|
==Objective==
This tutorial will teach you how to use the DS18B20 temperature sensor get the temperature value and display on digital tube.

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''
*Other hardware equipment
**Breadboard Jumper one box
**Breadboard one piece
**DS18B20 sensor one
**Digital tube one
**USB cable one

'''Speaker'''
[[File:第二十四课-DS18B20温度传感器.jpg|600px|center|thumb]]

DS18B20 is a commonly used temperature sensor, it has the the advantages of small volume, low hardware overhead, strong anti-jamming capability and high precision.
Correct connection: Facing the flat side, left is the negative and right is positive. Once the connection is wrong, it will heat up immediately, may burn! At the same time, this is also the cause of the sensor always displays 85℃.

==Schematic==
[[File:第二十四课-Microduino数码管温度计原理图.jpg|600px|center|thumb]]

Pin Table
{| class="wikitable"
|-
! Microduino Pin !! Digital Tube
|-
| D2 || 10(A)
|-
| D3 || 9(B)
|-
| D4 || 1(C)
|-
| D5 || 4(D)
|-
| D6 || 3(E)
|-
| D7 || 6(F)
|-
| D8 || 5(G)
|-
| 9 || 2(DP)
|-
| D10 || 8(LED1)
|-
| D11 || 7(LED2)
|}

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

byte digit0 = 10; //Ten digits bit
byte digit1 = 11; //Single digits bit
byte dotPin = 2; //Decimal point of digital tube

byte sevenSegmentPins[] = {
2,3,4,5,6,7,8}; //A,B,C,D,E,F,G's Microduino pin
byte sevenSegment[10][7] =
{
//a b c d e f g
{
0,0,0,0,0,0,1 }
, // = 0
{
1,0,0,1,1,1,1 }
, // = 1
{
0,0,1,0,0,1,0 }
, // = 2
{
0,0,0,0,1,1,0 }
, // = 3
{
1,0,0,1,1,0,0 }
, // = 4
{
0,1,0,0,1,0,0 }
, // = 5
{
0,1,0,0,0,0,0 }
, // = 6
{
0,0,0,1,1,1,1 }
, // = 7
{
0,0,0,0,0,0,0 }
, // = 8
{
0,0,0,1,1,0,0 } // = 9
};

void setup() {

//Initialize all lights up
pinMode(dotPin, OUTPUT); //pin 2
pinMode(digit0, OUTPUT); //pin 10
pinMode(digit1, OUTPUT); //pin 11

for(int i=0; i<7; i++)
{
pinMode(sevenSegmentPins[i], OUTPUT);
}
digitalWrite(dotPin, HIGH);
digitalWrite(digit0, HIGH);
digitalWrite(digit1, HIGH);

}

//Display number
void segmentWrite(byte digit)
{
byte pin = 2;
for (byte i=0; i<7; ++i)
{
digitalWrite(pin, sevenSegment[digit][i]);
++pin;
}
}

void loop() {

int n = analogRead(A0); //Read the voltage from AO
int vol = n * (5.0 / 1023.0*100); //Use a float type variable to store temperature value which was converted from voltage value

//Get the single digits number
int sd=vol%10;
//Get the ten digits number
int td=vol/10;

digitalWrite(digit0, LOW); //Turn off ten digits bit digital tube
segmentWrite(sd); //Display single digits bit
delay(10); //Delay 10ms
digitalWrite(digit0, HIGH); //Turn on ten digits bit digital tube
digitalWrite(digit1, LOW); //Turn off single digits bit digital tube
segmentWrite(td); //Diplay ten digits bit
delay(10); //Dealy 10ms
digitalWrite(digit1, HIGH); //Turn on single digital tube

}

</source>

==Debug==
Step 1：Copye the cdoe to IDE and compile it

Step 2：Set up circuti, as follows：

[[File:第二十四课-Microduino数码管温度计连接图.jpg|600px|center|thumb]]
Step 3：Run program

Step 4：Observe the digital tube, find a hot object close to the temperature sensor, the value on digital tube will change.

==Result==

The temperature sensor closes to the hot object, the value will increase.

==Video==

http://v.youku.com/v_show/id_XNjgyMzE4ODg4.html

Lesson 24--Microduino Digital Tube Thermometer - 版本历史

Pkj：Created page with "{{Language|第二十四课--Microduino 数码管温度计}} {| style="width: 800px;" |- | ==Objective== This tutorial will teach you how to use the DS18B20 temperature sensor ..."