Joerg Reisenweber wrote: > problem: > LED_COL0 +, LED_ROW0 GND: to make D19 light up. > "Parasitary" paths like D21->D26->D25, D21->D32->D31, D23->D28->D25 etc
Works great :) (The brightness is controlled by PWM.) http://downloads.qi-hardware.com/people/werner/m1/leds/ledm-in-m1.jpg While, in other experiments, I've seen chains of only two LEDs happily glow. Parasitic paths across three LEDs seem to be long enough to eliminate that problem. More details: - the board in the picture above: http://lists.milkymist.org/pipermail/devel-milkymist.org/2012-January/002641.html - LED placement (first try, not so good results) http://lists.milkymist.org/pipermail/devel-milkymist.org/2012-January/002632.html - LED placement (second try, better results) http://lists.milkymist.org/pipermail/devel-milkymist.org/2012-January/002636.html What we'll do is place the LEDs at the bottom, slightly off-center, as shown here: http://downloads.qi-hardware.com/people/werner/m1/leds/placement.pdf I wonder if we should also remove copper and solder mask at the PCB's edge near LEDs to allow the LED to shine upwards, as shown here: http://downloads.qi-hardware.com/people/werner/m1/leds/shine-through.pdf The LEDs are side-facing, so they emit light in this direction. - Werner _______________________________________________ http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org IRC: #milkymist@Freenode
