“控制led亮度”的版本间的差异
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==程序== | ==程序== | ||
− | https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Processing/LEDBrightness | + | [https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Processing/LEDBrightness LEDBrightness] |
注意:代码里包含图片请不要丢掉 | 注意:代码里包含图片请不要丢掉 |
2014年10月29日 (三) 07:04的最新版本
Language | English |
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目的本教程将教大家如何用Processing来控制LED灯的亮度。 设备
原理图
程序注意:代码里包含图片请不要丢掉 调试步骤一:按着原理图搭建硬件环境,像这样:
此代码可以随着鼠标的x轴的大小改变图片的亮度和控制小灯的亮度。 void draw() { loadPixels(); // We must also call loadPixels() on the PImage since we are going to read its pixels. img.loadPixels(); for (int x = 0; x < img.width; x++ ) { for (int y = 0; y < img.height; y++ ) { // Calculate the 1D pixel location int loc = x + y*img.width; // Get the R,G,B values from image float r = red (img.pixels[loc]); float g = green (img.pixels[loc]); float b = blue (img.pixels[loc]); // We calculate a multiplier ranging from 0.0 to 8.0 based on mouseX position. // That multiplier changes the RGB value of each pixel. float adjustBrightness = ((float) mouseX / width) * 8.0; r *= adjustBrightness; g *= adjustBrightness; b *= adjustBrightness; // The RGB values are constrained between 0 and 255 before being set as a new color. r = constrain(r,0,255); g = constrain(g,0,255); b = constrain(b,0,255); // Make a new color and set pixel in the window color c = color(r,g,b); pixels[loc] = c; } } updatePixels(); //output r value to ledpin arduino.analogwrite(ledPin, int(r)); }
步骤三:下载代码并编译通过。
结果鼠标在左边灯泡最暗,在右边最亮,随着从左到右逐渐变化,processing的效果是这样的。 鼠标在左边: 鼠标在中间: 鼠标在右边:
视频 |