arduino 套件使用说明书V1.0.pdf，
步进电机
DHT11
传感器另外一脚要接A0
/*
Web client This sketch connects to a website (http://www.google.com)
using an Arduino Wiznet Ethernet shield. Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13 created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe, based on work by Adrian McEwen */ #include <SPI.h>
#include <Ethernet.h> #define DHT11_PIN 1 // Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server[] = "192.168.1.95"; // name address for Google (using DNS) // Set the static IP address to use if the DHCP fails to assign
IPAddress ip(,,,); // Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client; void uploadData(String c,String h){
// if you get a connection, report back via serial:
if (client.connect(server, )) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /DHT11Data.ashx?C="+c+"&h="+h+" HTTP/1.1");
client.println("Host:192.168.1.95");
client.println("Connection: close"); client.println();
delay();
// if there are incoming bytes available
// from the server, read them and print them:
while (client.available()) {
char c = client.read();
Serial.print(c);
}
}
else {
// kf you didn't get a connection to the server:
Serial.println("connection failed");
} // if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop(); // do nothing forevermore: }
} byte read_dht11_dat()
{
byte i = ;
byte result = ;
for(i=;i<;i++)
{
while(!(PINC&_BV(DHT11_PIN)));
delayMicroseconds();
if(PINC&_BV(DHT11_PIN))
result|=(<<(-i));
while((PINC&_BV(DHT11_PIN)));
}
return result;
} void setup() { DDRC|=_BV(DHT11_PIN);
PORTC|=_BV(DHT11_PIN);
// Open serial communications and wait for port to open:
Serial.begin();
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
} // start the Ethernet connection:
if (Ethernet.begin(mac) == ) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip);
}
// give the Ethernet shield a second to initialize:
delay();
Serial.println("Ready"); } void loop()
{
byte dht11_dat[];
byte dht11_in;
byte i;
PORTC &= ~_BV(DHT11_PIN);
delay();
PORTC|=_BV(DHT11_PIN);
delayMicroseconds();
DDRC &= ~_BV(DHT11_PIN);
delayMicroseconds();
dht11_in = PINC & _BV(DHT11_PIN);
if(dht11_in)
{
Serial.println("dht11 start condition 1 not met");
return;
} delayMicroseconds();
dht11_in=PINC & _BV(DHT11_PIN);
if(!dht11_in) {
Serial.println("dht11 start condition 2 not met");
return;
} delayMicroseconds();
for(i=;i<;i++)
dht11_dat[i]=read_dht11_dat();
DDRC|=_BV(DHT11_PIN);
PORTC|=_BV(DHT11_PIN);
byte dht11_check_sum = dht11_dat[]+dht11_dat[]+dht11_dat[]+dht11_dat[];
if(dht11_dat[]!=dht11_check_sum)
{
Serial.println("DHT11 checksum error");
} uploadData(String(dht11_dat[]) +"." +String(dht11_dat[]),String(dht11_dat[]) +"." +String(dht11_dat[]) ); Serial.print("Current humdity= ");
Serial.print(String(dht11_dat[]));
Serial.print(".");
Serial.print(dht11_dat[],DEC);
Serial.print("%");
Serial.print("temperature = ");
Serial.print(dht11_dat[],DEC);
Serial.print(".");
Serial.print(dht11_dat[],DEC);
Serial.println("C"); delay();
}
调整PWM频率
源代码如下：Here are some usage examples of the function: // Set pin 9's PWM frequency to 3906 Hz (31250/8 = 3906)
// Note that the base frequency for pins 3, 9, 10, and 11 is 31250 Hz
setPwmFrequency(, ); // Set pin 6's PWM frequency to 62500 Hz (62500/1 = 62500)
// Note that the base frequency for pins 5 and 6 is 62500 Hz
setPwmFrequency(, ); // Set pin 10's PWM frequency to 31 Hz (31250/1024 = 31)
setPwmFrequency(, ); Please keep in mind that changing the PWM frequency changes the Atmega's timers and disrupts the normal operation of many functions that rely on time (delay(), millis(), Servo library). /**
* Divides a given PWM pin frequency by a divisor.
*
* The resulting frequency is equal to the base frequency divided by
* the given divisor:
* - Base frequencies:
* o The base frequency for pins 3, 9, 10, and 11 is 31250 Hz.
* o The base frequency for pins 5 and 6 is 62500 Hz.
* - Divisors:
* o The divisors available on pins 5, 6, 9 and 10 are: 1, 8, 64,
* 256, and 1024.
* o The divisors available on pins 3 and 11 are: 1, 8, 32, 64,
* 128, 256, and 1024.
*
* PWM frequencies are tied together in pairs of pins. If one in a
* pair is changed, the other is also changed to match:
* - Pins 5 and 6 are paired on timer0
* - Pins 9 and 10 are paired on timer1
* - Pins 3 and 11 are paired on timer2
*
* Note that this function will have side effects on anything else
* that uses timers:
* - Changes on pins 3, 5, 6, or 11 may cause the delay() and
* millis() functions to stop working. Other timing-related
* functions may also be affected.
* - Changes on pins 9 or 10 will cause the Servo library to function
* incorrectly.
*
* Thanks to macegr of the Arduino forums for his documentation of the
* PWM frequency divisors. His post can be viewed at:
* http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235060559/0#4
*/
void setPwmFrequency(int pin, int divisor) {
byte mode;
if(pin == || pin == || pin == || pin == ) {
switch(divisor) {
case : mode = 0x01; break;
case : mode = 0x02; break;
case : mode = 0x03; break;
case : mode = 0x04; break;
case : mode = 0x05; break;
default: return;
}
if(pin == || pin == ) {
TCCR0B = TCCR0B & 0b11111000 | mode;
} else {
TCCR1B = TCCR1B & 0b11111000 | mode;
}
} else if(pin == || pin == ) {
switch(divisor) {
case : mode = 0x01; break;
case : mode = 0x02; break;
case : mode = 0x03; break;
case : mode = 0x04; break;
case : mode = 0x05; break;
case : mode = 0x06; break;
case : mode = 0x7; break;
default: return;
}
TCCR2B = TCCR2B & 0b11111000 | mode;
}
}
关于按钮软件去抖动法
unsigned char btnIsPress=;
const int buttonPin = ; // 按键位置
const int ledPin = ; // led 位置
// 定义变量
int ledState = HIGH; // 当前led 状态
int buttonState=; // 读取的当前按键状态
int lastButtonState = ; // 上次读取的按键状态
// 使用长整型变量
long lastDebounceTime = ; // 上次按键触发时间
long debounceDelay = ; // 去抖时间，根 void setup() {
// put your setup code here, to run once: pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);
// 初始化led 的状态
digitalWrite(ledPin, ledState);
Serial.begin(); } void loop() {
// put your main code here, to run repeatedly:
// checkResetPress();
checkBtnPress();
} void checkBtnPress(){
int reading = digitalRead(buttonPin); if (reading != lastButtonState) {
lastDebounceTime = millis();
} if ((millis() - lastDebounceTime) > debounceDelay) {
if (reading != buttonState) {
buttonState = reading;
if (buttonState == HIGH) {
ledState = !ledState;
}
}
} digitalWrite(ledPin, ledState);
lastButtonState = reading;
}
void checkResetPress(){
btnIsPress= digitalRead(buttonPin);
Serial.println(btnIsPress);
if(btnIsPress==){
delay();
btnIsPress= digitalRead(buttonPin);
if(btnIsPress==){
delay();
btnIsPress= digitalRead(buttonPin);
if(btnIsPress==){
Serial.println("yes!");
} }
}
}
上面代码中，if (buttonState == HIGH){ledState=!ledState;} 表示只识别脉冲的上升或阶段,因为一次按键相当于一次脉冲，有上升与下降两个边缘，
如果去掉判断，那么没次按钮时，只能发现led闪几下就又恢复原样(按前是灭还是亮)