IR LED

IR LED Designs

Among other things, the wavelength determines the range.
940nm is used for the function module and control unit.
Different IR LEDs are required for boosters and PC transmitters.

5 mm design

Illuminators on the roadside or in the roadway.
3 mm or 5 mm IR LEDs are the easiest to process.

These IR LEDs have wire connections.
The long pin is + and the short pin is -.

The current is adjusted using a series resistor in front of the LED.
Function block: 50 ohms to 1 kOhm
Digital control unit: 220 ohms to 2.2 kOhms and 1N4001
See also programming set = Progset

To adjust the range, a small resistor (47 ohms) and a potentiometer of 500 ohms are recommended. The lower the current, i.e., the higher the resistance value, the more LEDs can be connected.
A maximum of 50 LEDs are conceivable per function block.
In practice, cable lengths should be kept short, allowing more function blocks to be used, each with fewer LEDs per output.

5 mm long-range emitter design (different wavelength)

This design is also used for the DC Car Booster and the PC Transmitter.
A range of up to 7 meters is achieved with a 20-degree LED.
Typically, the 40-degree LEDs are used with a shorter distance from the ceiling.
Such emitters can also be installed at street level.
It should be noted, however, that the LCIR receiver in the vehicle is usually located in the Driver's cab.
If the vehicle moves away from the reflector, the rear prevents reception.
Therefore, it may be useful to allow the signal to reach the vehicle from both directions.

SMD design

In contrast to the IR-FTR phototransistor, the IR LED emits invisible light to the rear.
In the DC-Car, this enables data transmission and thus automatic distance control.
Of these reflectors, one is required for small vehicles, such as a car, and two for large vehicles.
For larger scales, the 3 mm IR LED can also be used.

Please note: The markings are different for each supplier.
Therefore, inspect the front carefully or check with a continuity tester.
Integrated in the Handsender24plus

Potential Applications

The 0603 SMD design can be used: Rear for distance control On the side for feedback Downward for feedback Rear for the wireless trailer As a spotlight with the function block As a spotlight with the digital control center To send functions from the road to the car, these can also be easily hidden in the road. This is also how they are built into the delineator posts. However, the range is shorter than with 3 or 5 mm LEDs.

IR LED rear, bottom, or to the side

Attention!

Phototransistor front Connection

Testing with in a test circuit

A normal LED in series with a resistance of 1 kOhm lights up at 5 volts - 12 volts.
The circuit is opened and the IR LED is clamped in between.
If it is correctly connected, the LED will glow slightly dimmer than before.

If a phototransistor is accidentally included in the circuit, the LED will only glow if the phototransistor receives a lot of light.

A plug with two crocodile clips is available as an optional accessory for the Handsender24plus. This allows LEDs and phototransistors to be tested.
see also Handheld transmitter