控制led亮度
Pkj(讨论 | 贡献)2014年5月5日 (一) 08:13的版本 (Created page with "{| style="width: 800px;" |- | ==目的== 本教程将教大家如何用Processing来控制LED灯的亮度。 ==设备== *'''Microduino-Core''' *'''Microduino-FT232R'...")
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
程序见 LEDBrightness
调试步骤一:解释一下代码: 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.digitalwrite(ledPin, r); } 步骤二:按着原理图搭建硬件环境,像这样:
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:
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