LEDs

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

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

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 Ω 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.

We need a 330Ω 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.

However, the rgb LED with the standard LED shape has 1kΩ 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.

		Not to be confused with this ->

Not to be confused with this ->

The Laser

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

-- Uli Raich - 2017-01-03

Comments

Attachments

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

Topic revision: r1 - 2017-01-03 - uli