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LEDs

5 out of the 37 sensors are some sort of LEDS:

First we have the standard LEDs (not part of the sensor kit)

led.png leds.png

ledschematics.png

As you can see from the photo LEDs have leads with different length, the longer one being the anode and must therefore be connected to the + pole. The current through the LED must be limited to some tens of mA, which means that we need a resistor (typically 330 if the LED is powered with 3.3 V) as shown in the circuit diagram.

2 colored LEDs

The sensor kit has 5 LED circuits which feature multi-color LEDs. First there are 2 color LEDs with exactly the same functionality but different LED sizes.

2colorLEDs.png 2colLedschematic.png
We need a 330 resistor from the - pin to ground. The S pin lights the green diode, whilethe middle pin lights the red diode.

In addition to the 2 colored LED there is a tiny red SMD LED with its associate current limiting resistor. This can be activated
through pin 2 (+) and pin 3 (S, now -, note that S is the + pin when accessing the 2-colored LED)

rgb LEDs

Again we have 2 circuit boards with essentially the same functionality.

3colLed-1.png 3colLed-2.png
rgbSMDschematic.png rgdLEDschematic.png
However, the rgb LED with the standard LED shape has 1k current limiting resistors already installed on the PCB while the surface mount (flat) LED does not.
So be careful!

The flashing colored LED

This LED automatically cycles through different colors and flashes. It is connected like the simple LED. In addition to the flashing colored LED there is the IR (infra red)
transmitter which is hardly distinguishable from the flashing LED. The plastic bag containing the PCB however is clearly marked.

flashingLED.png flashSchematic.png

Not to be confused with this ->

IREmit.png

The Laser

In contrast to the LEDs the laser can be directly connected to 3.3V.

laser.png laserSchematic.png

-- Uli Raich - 2017-01-03

Comments

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng 2colLedschematic.png r1 manage 11.4 K 2017-01-03 - 20:24 UnknownUser 2 colored LED schematic
PNGpng 2colorLEDs.png r1 manage 980.4 K 2017-01-03 - 20:45 UnknownUser 2 colored LEDs
PNGpng 3colLed-1.png r1 manage 495.1 K 2017-01-03 - 20:52 UnknownUser SMD rgb LED
PNGpng 3colLed-2.png r1 manage 581.9 K 2017-01-03 - 20:52 UnknownUser rdb LED
PNGpng IREmit.png r1 manage 1104.6 K 2017-01-03 - 21:02 UnknownUser IR transmitter
PNGpng flashSchematic.png r1 manage 6.9 K 2017-01-03 - 20:24 UnknownUser flash LED schematic
PNGpng flashingLED.png r1 manage 2292.9 K 2017-01-03 - 21:03 UnknownUser flash LED
PNGpng laser.png r1 manage 414.1 K 2017-01-03 - 21:02 UnknownUser laser
PNGpng laserSchematic.png r1 manage 6.7 K 2017-01-03 - 21:09 UnknownUser laser schematic
PNGpng led.png r1 manage 51.1 K 2017-01-03 - 20:28 UnknownUser LED explanation
PNGpng leds.png r1 manage 2950.7 K 2017-01-03 - 20:10 UnknownUser standard LEDs
PNGpng ledschematics.png r1 manage 7.2 K 2017-01-03 - 20:28 UnknownUser LED schematics
PNGpng rgbSMDschematic.png r1 manage 7.6 K 2017-01-03 - 20:24 UnknownUser SMD rgb LED schematic
PNGpng rgdLEDschematic.png r1 manage 9.8 K 2017-01-03 - 20:25 UnknownUser rgb LED schematic
Topic revision: r1 - 2017-01-03 - uli
 
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