从处理回Arduino的发送数据 [英] Sending data from processing back to arduino

问题描述

我们有计数有关brexit refenrendum鸣叫为肯定和否定的数目的方案。这里有一个引擎收录的链接，因为我不能得到code正确格式： http://pastebin.com/ G3v02KjF

We have a program that counts the number of tweets for yes and no relating to the brexit refenrendum. Here's a link to a pastebin since I couldn't get the code to properly format: http://pastebin.com/G3v02KjF

总之，我们把从处理信息到Arduino得到使用Twitter4j库的tweet。我们统计的微博，并获得了一些我们想成为一个伺服的角度。但是，我们无法弄清楚如何将此号码发送回Arduino的，所以我们可以控制伺服。

Anyway, we're sending information from processing to the arduino to get the tweets using the Twitter4j library. We've counted the tweets and received a number that we want to be the angle of a servo. However, we can't figure out how to send this number back to arduino so we can control the servo.

我们将如何去这样做呢？

How would we go about doing this?

推荐答案

有一个看串行库参考和的write（）特别功能。

既然你传递一个值，角度（从0到180），这个整数值可以作为发送一个字节。例如，在 calculateAngle（）功能，您可以将其发送到Arduino的：

Since you're passing a single value, the angle (from 0 to 180) this integer value can be send as a single byte. For example in the calculateAngle() function you can send it to arduino:

if(myPort != null) myPort.write((int)angle);

（裸记住，浮点值转换为整数将地板/轮值向下）

(Bare in mind, casting the float value to an integer will floor/round the value down)

在Arduino的一面，你只需要读值回，如果有至​​少一个字节可用。这是一个好主意，约束（）值，以防万一有错误（和你不希望使用无效伺服位置）

On the Arduino side, you simply need to read the value back, if there is at least one byte available. It's a good idea to constrain() the value, just in case there are errors (and you wouldn't want to use invalid servo positions)

if(Serial.available() > 0){
  int angle = constrain(Serial.read(),0,180);
  myservo.write(angle);
}

一定要签出下面的例子：

Be sure to checkout the following examples:

• 加工>例子>库>串行> SimpleWrite （用在处理草图的底部提供了Arduino的code）


• 的Arduino>例子> 04.Communication> 的serialEvent

• Processing > Examples > Libraries > serial > SimpleWrite (use the Arduino code provided at the bottom of the Processing sketch)
• Arduino > Examples > 04.Communication > SerialEvent

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