.:madworm:.'s photos with the keyword: laen

Fixing the LED pin issue

Fixing the LED pin issue

.:madworm:.
22 Apr 2011 117
I used my table top milling machine to remove some material. This avoids accidental shorting to the ground plane. Left one: using a small bit Right one: using a large bit, which saves time.
Lighting up my kitchen workspace

Lighting up my kitchen workspace

.:madworm:.
22 Apr 2011 137
One board is still missing, but its quite bright already.
Purple everything!

Purple everything!

.:madworm:.
15 Feb 2012 74
This time shipping 'only' took 11 days...
Two boards connected

Two boards connected

.:madworm:.
22 Apr 2011 129
Translucent PCB

Translucent PCB

.:madworm:.
22 Apr 2011 152
The boards are actually quite purple.
Two boards connected - 20W

Two boards connected - 20W

.:madworm:.
22 Apr 2011 141
Saving pins by using an ADC channel to read 3 buttons is OK for just one board. But as soon as I connect two of them, the voltage levels are off. This was to be expected, as now two pullups are there, but even after removing one of them... doesn't work. The SMD resistors also vary quite a lot it seems. As I have another pin on the bus, I might later create some sort of message system to let the boards talk to each other (half duplex).
BestKitchenLightsEver™

BestKitchenLightsEver™

.:madworm:.
22 Apr 2011 253
The final board. It takes about 8.5 to 10W, depending on the supply voltage. It is designed to run at 660mA. The LEDs are grouped in sets of 4, which requires about 12V to run at a high enough current. The LED driver takes about 0.7V off, so we're looking at a real 12.5V to 13V on the supply voltage connectors. Each group can be controlled individually, but currently all 8 channels are treated as one. The PWM is generated by a timer compare match interrupt. The data is sent via SPI to the LED driver.
This one looks quite right

This one looks quite right

.:madworm:.
22 Apr 2011 139
I finally managed to capture the 'purple-ness' of the boards adequately.
It's alive

It's alive

.:madworm:.
22 Apr 2011 152
This is what it looks like before the LED catastrophe. I had to remove 16 of them as something was shorting. I suspect that parts of the extremely wide pins (uses as heatsinks as well) were shorting to the ground plane somehow. I clipped them and partially ruined my wire cutter. It wasn't meant to cut such thick stuff. Only 64 more of these to go (LEDs not boards).
It's alive

It's alive

.:madworm:.
22 Apr 2011 144
This is what it looks like before the LED catastrophe. I had to remove 16 of them as something was shorting. I suspect that parts of the extremely wide pins (uses as heatsinks as well) were shorting to the ground plane somehow. I clipped them and partially ruined my wire cutter. It wasn't meant to cut such thick stuff.