这个问题是我在此问到的另一个问题answered。
我有以下功能:
MotiColor startColor;
MotiColor endColor;
void setup()
{
// Begin strip.
strip.begin();
// Initialize all pixels to 'off'.
strip.show();
Serial1.begin(9600);
startColor = MotiColor(0, 0, 0);
endColor = MotiColor(0, 0, 0);
}
void loop () {
}
int tinkerSetColour(String command)
{
strip.show();
int commaIndex = command.indexOf(',');
int secondCommaIndex = command.indexOf(',', commaIndex+1);
int lastCommaIndex = command.lastIndexOf(',');
String red = command.substring(0, commaIndex);
String grn = command.substring(commaIndex+1, secondCommaIndex);
String blu = command.substring(lastCommaIndex+1);
startColor = MotiColor(red.toInt(), grn.toInt(), blu.toInt());
int16_t redDiff = endColor.getR() - startColor.getR();
int16_t greenDiff = endColor.getG() - startColor.getG();
int16_t blueDiff = endColor.getB() - startColor.getB();
int16_t _delay = 500;
int16_t duration = 3500;
int16_t steps = duration / _delay;
int16_t redValue, greenValue, blueValue;
for (int16_t i = steps; i >= 0; i--) {
redValue = (int16_t)startColor.getR() + (redDiff * i / steps);
greenValue = (int16_t)startColor.getG() + (greenDiff * i / steps);
blueValue = (int16_t)startColor.getB() + (blueDiff * i / steps);
sprintf(rgbString, "%i,%i,%i", redValue, greenValue, blueValue);
Spark.publish("rgb", rgbString);
for (uint16_t i = 0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(redValue, greenValue, blueValue));
}
delay(_delay);
}
delay(_delay);
for (uint16_t i = 0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(endColor.getR(), endColor.getG(), endColor.getB()));
}
delay(_delay);
endColor = MotiColor(startColor.getR(), startColor.getG(), startColor.getB());
return 1;
}
我正确看到发布的结果:
这是从OFF(0,0,0) - &gt; RED(255,0,0) - &gt;格林(0,255,0)。
当我通过Spark.publish()
事件将结果发布回Web控制台时,它工作正常,但是实际的Neopixel LED不会像预期的那样从颜色渐变到颜色。它们只是从颜色变为颜色而不是在它们之间很好地褪色。
我只是想知道我哪里出错了,或者我如何改进我的代码,以便实际看到实时消失。
答案 0 :(得分:2)
您必须在for循环中调用strip.show(),如下所示:
for (int16_t i = steps; i >= 0; i--) {
redValue = (int16_t)startColor.getR() + (redDiff * i / steps);
greenValue = (int16_t)startColor.getG() + (greenDiff * i / steps);
blueValue = (int16_t)startColor.getB() + (blueDiff * i / steps);
sprintf(rgbString, "%i,%i,%i", redValue, greenValue, blueValue);
Spark.publish("rgb", rgbString);
for (uint16_t i = 0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(redValue, greenValue, blueValue));
}
// !!! Without this, you'll only see the result the next time you call
// tinkerSetColor() !!!
strip.show();
delay(_delay);
}
要了解正在发生的事情,您可以查看NeoPixel库源代码。您将看到strip.setPixelColor()
仅将RGB值存储在内存中(将其视为绘图缓冲区,以便您可以立即更新整个条带,这在您了解控制器芯片的工作原理时有意义) 。调用strip.show()
会导致将值推送到串行中的每个像素的例程运行。