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leds [2015/08/16 14:35]
draget Cleared up wording 		leds [2015/12/20 23:07]
schneider [RGB LEDs]
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   - build some complex SMD sculpture using wires (more about this at the bottom of the page)   - build some complex SMD sculpture using wires (more about this at the bottom of the page)
 +  - build a working high-side switch [[starblue led power|using two MOSFETs]] to get the functionality that was originally intended (or optionally to switch LED power with a GPIO port)
   - try to use a jumper/​switch to bridge two of the transistor pads   - try to use a jumper/​switch to bridge two of the transistor pads
   - bridge two of the transistor pads with solder   - bridge two of the transistor pads with solder
  
-The last option has the disadvantage that the LEDs will always consume ​a little power but it is the easiest option and the power consumption is acceptable. If you want to safe battery power, you can unplug the battery.+The last option has the disadvantage that the blue LED will be a bit dimmer ​but it is the easiest option and the LEDs are quite bright already.
  
 There are spaces for capacitors which are recommended,​ but the LEDs usually work fine without. There are spaces for capacitors which are recommended,​ but the LEDs usually work fine without.
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 Example with all possible LEDs and correct bridges on two of the three transistor pins (for power supply) soldered (LEDs green, bridges red): Example with all possible LEDs and correct bridges on two of the three transistor pins (for power supply) soldered (LEDs green, bridges red):
-{{ :led3.png?100 |}}+{{ :led3.png?600 |}}
  
 Example with only two LEDs at the antenna, then the bridges at the lower part of the board aren't needed but you need to add bridges for transporting the signal (ignore the yellow arrows): https://​twitter.com/​michaelossmann/​status/​629779084801781760 Example with only two LEDs at the antenna, then the bridges at the lower part of the board aren't needed but you need to add bridges for transporting the signal (ignore the yellow arrows): https://​twitter.com/​michaelossmann/​status/​629779084801781760
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 The 2 lower LEDs should be yellow, the one at the tip of the antenna should be green and the other 5 LEDs on the antenna blue. The 2 lower LEDs should be yellow, the one at the tip of the antenna should be green and the other 5 LEDs on the antenna blue.
  
-== How to properly solder the LED's +===== The Hard Way ===== 
- +Have a look at [[leds-the-hard-way|How ​to properly ​solder the LED'​s]] to see how to get a bit more brightness out of your LEDs.
-To solder the LED's properly you have to do a few things. There are mainly two things you have to care of, the wiring and the capacitors. +
-So we will add some thin wires, capacitors and of course the LED's to the rad1o. +
- +
-__Why?__ +
- +
-Wires: If you solder bridges onto the transistor pads ( like explained earlier ), the processor will be always on draining some power also the voltage might be too high, because VIN and VCC are directly connected. With the wires not. +
- +
-Capacitors: The WS2812B LED's are very vulnerable to not having a 100nF capacitor soldered next to their power pins, the internal controller pulses the LED's ( PWM ), so the current conversion is also very pulsed. That will cause voltage spikes on the ground ( Yes ground ) line, which will destroy the controller/​the LED. +
- +
-LED's: Why you ask, LED's are fancy \o/  +
- +
-__What you will need:__ +
- +
-  * Thin isolated wire ( 0.2 mm enamelled copper wire [ Kupferlackdraht ] works fine ) +
-  * 8 100nF SMD capacitors +
-  * 8 WS2812B LED'​s +
-  * Soldering iron, solder, tweezers, Mate, etc +
- +
-__Step 1__  +
- +
-Add the thin wire to the solder ​pads like in the picture below. +
- +
-{{:​img_20150814_075501.jpg?​800|}} +
-{{:​img_20150814_075511.jpg?​800|}} +
-{{:​img_20150814_075519.jpg?​800|}} +
- +
- +
-__Step 2__ +
- +
-Add the LED's. +
- +
-( scroll up for an explaining picture [ [[https://​rad1o.badge.events.ccc.de/​leds#​which_way_around_do_the_leds_go|Or click me]] ] ) +
- +
- +
-__Step 3__ +
- +
-Now you should add the capacitors, that is kind of hard to do, because three capacitors don't have solder pads. +
- +
-{{:​img_20150814_075501_01.jpg?​800|}} +
- +
-You can see the new capacitors next to the upper left LED pins. +
- +
-{{:​img_20150814_075401.jpg?​800|}} +
-{{:​img_20150814_075430.jpg?​800|}} +
-{{:​img_20150814_075422.jpg?​800|}} +
- +
-I hope that the pictures are clear enough, there has to be a 100nF capacitor next to the power pins of every LED. +
- +
-__Step 4__ +
- +
-Test it. +
- +
-{{:​bagde_bright.jpg?​400|}} +
-{{:​bagde_dark.jpg?​400|}} +
- +
-Yay \o/ +
- +
leds.txt · Last modified: 2015/12/20 23:10 by schneider

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