案例四：Arduino超声波测距采集案例
本帖最后由 weijinhe 于 2014-10-15 12:45 编辑www.machtalk.net
1、硬件准备（1）Arduino uno （2）超声波测距传感器模块（3）Arduino Ethernet W5100 网络扩展板模块（4）网线一根
2、硬件连接（1）Arduino Ethernet W5100 网络扩展板模块与Arduino uno连接。（2）Arduino Ethernet W5100 网络扩展板模块插上网线（3）超声波传感器VC GND Trgpin EchoPin 分别与Arduino uno 5V GND 数字量2 3连接。3、烧写代码const int TrigPin = 2;
const int EchoPin = 3;
float cm;
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192,168,0,12);
EthernetClient client;
IPAddress server(60,211,253,162);
unsigned long lastConnectionTime = 0;
boolean lastConnected = false;
const unsigned long postingInterval = 10*1000;
void setup() {
Serial.begin(9600);
while (!Serial) {
;
}
pinMode(TrigPin, OUTPUT);
pinMode(EchoPin, INPUT);
pinMode(8,OUTPUT);
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
Ethernet.begin(mac, ip);
}
}
void loop() {
digitalWrite(TrigPin, LOW); //低高低电平发一个短时间脉冲去TrigPin
delayMicroseconds(2);
digitalWrite(TrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(TrigPin, LOW);
cm = pulseIn(EchoPin, HIGH) / 58.0; //将回波时间换算成cm
cm = (int(cm * 100.0)) / 100.0; //保留两位小数
//Serial.println(cm);
delay(100);
if (client.available()) {
char c = client.read();
Serial.print(c);
}
if (!client.connected() && lastConnected) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
}
// if you're not connected, and ten seconds have passed since
// your last connection, then connect again and send data:
if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
sendData(cm);
}
// store the state of the connection for next time through
// the loop:
lastConnected = client.connected();
}
// this method makes a HTTP connection to the server:
void sendData(float thisData) {
// if there's a successful connection:
if (client.connect(server, 10086)) {
Serial.println("connecting...");
char tempStr3;
floatToString(cm,tempStr3);
String data;
data+="";
data+=String(tempStr3);
int t=data.length();
client.println("POST /v1.0/device/9c12597e7756453389068fdff7ad93f9/1/1/datapoints/add HTTP/1.1");
client.println("Host: api.machtalk.net");
client.println("APIKey:7a19bd7874a541a6b4c50a831ea0b3b2");
client.print("Accept: *");
client.print("/");
client.println("*");
client.print("Content-Length: ");
int thislength=17+t;
client.println(thislength);
client.println("Content-Type: application/x-www-form-urlencoded");
client.println("Connection: close");
client.println();
client.print("params={\"value\":");
client.print(thisData);
client.println("}");
}
else {
// if you couldn't make a connection:
Serial.println("connection failed");
Serial.println();
Serial.println("disconnecting.");
client.stop();
}
// note the time that the connection was made or attempted:
lastConnectionTime = millis();
}
void floatToString(float in,char* out){
uint16_t Tc_100 = in*100;
uint8_t whole, fract;
whole = Tc_100/10 ;// separate off the whole and fractional portions
fract = Tc_100 % 100;
sprintf(out,"%d.%d",whole,fract);
}4、Machtalk物联网平台配置Machtalk物联网平台配置、动作设置、触发器设置如http://machtalk.net/intro/regist所示，不再累述。www.machtalk.net技术交流群：300250166
吼吼！！！！
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