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leds [2015/08/22 21:23]
schneider 		leds [2015/12/20 23:10]
schneider
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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
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 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.
 +
 +== Which way around do the LEDs go?
 +
 +If you have a close look at an LED, you'll notice one corner is marked by having a bit cut off.
 +In the photo below, the pads where this corner needs to be are marked in red:
 +
 +{{::​leds.png?​600|}}
 +
 +== How to supply the LEDs with power
  
 **Do not bridge all three pads of each transistor as this will create a short!** ​ **Do not bridge all three pads of each transistor as this will create a short!** ​
  
 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
  
 Sorry for that, but wouldn'​t it be boring otherwise? :-P Sorry for that, but wouldn'​t it be boring otherwise? :-P
- 
-== Which way around do the LEDs go? 
- 
-If you have a close look at an LED, you'll notice one corner is marked by having a bit cut off. 
-In the photo below, the pads where this corner needs to be are marked in red: 
- 
-{{::​leds.png?​200|}} 
- 
  
 == I soldered one LED but it doesn'​t work? == I soldered one LED but it doesn'​t work?
 All LEDs are on the same data line, if they are not all soldered on, the data line is interrupted. You can either solder on all LEDs or bridge the data line. The image below shows where the data line goes, red lines are on the PCB, green lines are usually closed by LEDs. If you are not filling all LED spots, you have to fill the missing connections with wire. All LEDs are on the same data line, if they are not all soldered on, the data line is interrupted. You can either solder on all LEDs or bridge the data line. The image below shows where the data line goes, red lines are on the PCB, green lines are usually closed by LEDs. If you are not filling all LED spots, you have to fill the missing connections with wire.
  
-{{::​leds-data.png?​200|}}+{{::​leds-data.png?​600|}}
  
 == Will the LEDs do something as soon as I switch the rad1o on? == Will the LEDs do something as soon as I switch the rad1o on?
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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 (as explained earlier), the LEDs will be supplied with 3.3 V and not the recommended >4.5 V. With the wires there will be roughly 3.5 V to 4.3 V supplied to the LEDs, which is closer to their specification. +
- +
-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 can cause voltage spikes on the ground (Yes, ground) line, which could destroy the controller/​the LED. +
- +
-LED's: Why do 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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