Optimal solution: don't do it. You can spare a few resistors, cannot you?
Suboptimal solution #1: run the leds hot. leds at 15ma are roughly as bright as leds at 20ma or 25ma, etc.
Suboptinal solution #2: dynamically alter the display duration based on the number of segments lit. If you are lighting up two segments, "1" for example, display it for 1ms; if you are lighting up 5 segments ("5"), you display it for 2ms. This can be easily done with an array and loading up the timer offset / top in the isr.
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn/data/attach/logo/logo.png', '推荐 lmt50211 的问题《数码管公共脚接电阻,如何解决因亮多段而引起的亮度不同》','https://www.xiaopingtou.net/q-165128.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
Easy:
Optimal solution: don't do it. You can spare a few resistors, cannot you?
Suboptimal solution #1: run the leds hot. leds at 15ma are roughly as bright as leds at 20ma or 25ma, etc.
Suboptinal solution #2: dynamically alter the display duration based on the number of segments lit. If you are lighting up two segments, "1" for example, display it for 1ms; if you are lighting up 5 segments ("5"), you display it for 2ms. This can be easily done with an array and loading up the timer offset / top in the isr.
一周热门 更多>