如何制作植物监测仪
本项目主要制作一款植物监测仪，功能是：水分传感器提示LED闪烁，并在植物需要用水时使用IFTTT向手机发送相关信息。该项目需要使用的东西：
硬件光子（Particle Photon）物联网开发板Particle Electron电容式土壤湿度传感器
软件IFTTT Maker服务ThingSpeak应用程序界面
故事
https://v.qq.com/x/page/k08672xo05u.html
大部分人的房子里面都有一种或多种盆栽植物需要定期进行浇水。问题是，除非您是开专业花店的，否则您并不知道每棵植物何时需要浇水。为了解决这个问题，我们开发了一个系统，当您的植物需要水分时，系统会通过手机向您发送通知。
首先，水分传感器连接Photon并放置在盆栽植物中。然后，当传感器读取湿度值低于20时，Photon会通过编程方式发布一个名为“moisturePercentage”的事件。同时，Electron会订阅和发布该事件，以及发布自己的事件，两个事件被称为“plantStatus”和“handshake”；届时它将会把名为thirsty的变量的值从true更改为false。IFTTT将订阅“plantStatus”并向用户的IFTTT应用程序发送相关通知，而Photon将订阅“handshake”事件并在听到它时停止发布“moisturePercentage”。在electron的代码中，某个while循环将导致其LED开始闪烁，并对变量进行赋值thirsty = true。这为用户提供了另一种通知方式，防止用户未带手机的情况。当植物淹泡在水中时，水分含量将升至45以上，这导致Photon发布另一个名为“plantWatered”的事件，Electron会订阅该事件。这使得植物缺水的变量设置为false，防止电子LED闪烁。经过一段时间后，这些水分将被植物所吸收，并且整个过程将重新开始。
我们决定观察植物吸收水分时，水分含量如何变化，这个过程将非常有趣。因此，每次Photon对其进行记录时，我们都会通过一些事物对水含量进行记录。我们发现我们所选的血根草植物能够很快吸收我们供给的水，并且必须每隔一天至少浇一次水。
原理图Particle Photon的代码：
int boardLed = D7; //LED D7 for testing purposes
int moisture_pin = A1; //connection point for moisture sensor
bool messageSent = false; //variable for checking if notification has been sent to phone
String plantWatered = "Your plant has been watered and is moist";
void setup() {
pinMode(boardLed,OUTPUT); //output to turn on LED for setup
pinMode(moisture_pin,INPUT); //Input from moisture sensor
//Flashes LED to indicate that flash is successful.
digitalWrite(boardLed,HIGH);
delay(2000);
digitalWrite(boardLed,LOW);
delay(2000);
digitalWrite(boardLed,HIGH);
delay(2000);
digitalWrite(boardLed,LOW);
delay(2000);
}
void loop() {
//digitalWrite(boardLed,HIGH);
// Now we'll take some readings...
int moisture_analog = analogRead(moisture_pin); // read capacitive sensor
float moisture_percentage = (100 - ((moisture_analog/4095.00) * 100 ));
Particle.subscribe("handshake", handShake, "34002f000a47373336373936"); //Subscribe command to listen to other device
if (moisture_percentage <= 22 && messageSent == false){ //Checks if moisture percentage is below threshold and also checks if the water message has been sent
Particle.publish("moisturePercentage", String(moisture_percentage),60,PUBLIC); //Publishes for message to be sent
}
if (moisture_percentage > 40 && messageSent == true){ //Checks if moisture levels have gone back up and also checks if message has been sent
Particle.publish("plantWatered", plantWatered, 60, PUBLIC);
messageSent = false; //If message sent, and plant watered, it resets the program so that the function above will run
}
Particle.publish("plantStatus_percentage", String(moisture_percentage),60,PUBLIC); //Publish command for logging data and sending it to thingspeak
//digitalWrite(boardLed,LOW);
delay(15000);
}
void handShake( const char *event, const char *data){ //If the message has been sent, it sets messageSent to true
messageSent = true;
}
Particle Electron 的代码：
int led=D7;//led that indicates the plant needs water
bool sent=false;// has the notification to water the plant been sent
bool thirsty=false;//whether or not the plant needs water
void setup()
{
pinMode(led,OUTPUT);
}
void loop()
{
Particle.subscribe("moisturePercentage",waterPlant,"3c0026001747373335333438");
while(thirsty==true)
{//while the plant needs water the LED flashes and the electron listens for when the water level goes up
digitalWrite(led,HIGH);
delay(500);
digitalWrite(led,LOW);
delay(500);
Particle.subscribe("plantWatered",breakloop,"3c0026001747373335333438");// checks for when the plant has been waterd.
}
delay(5000);// this loop every five minutes
}
void waterPlant( const char *event, const char*data)
{
Particle.publish("plantStatus","thirsty",60,PUBLIC);//sends a message to IFTTT to notify me to water my plants.
sent=true;
Particle.publish("handshake","sent",60,PUBLIC);// notifies the photon that the message has been sent
thirsty=true;
}
void breakloop( const char *event, const char*data)// changes thirsty to false to break the while loop and stop the led from flashing
{
thirsty=false;
sent=false;
}
原文：How to make a Plant Monitor 这个不错 很赞，实用。。。。。。。。。。。。。。。。 这个创意挺好的{:5_153:} 楼主 可以加qq吗 我最近也想弄一个土壤检测湿度温度我们学校的比赛有需要 1787211521我的QQ
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