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Connection of the LEDs for the stop and back lights
The two LEDs for the stop and back lights have to be connected in series,
i.e. the anode (+) of the one LED has to be connected to the cathode (-)
of the other LED. Next connect the disconnected anode with connecting
point X6 and the disconnected cathode with connecting point X3.
Connection of the diodes for the front light
You may connect up to two white LEDs for the front lighting to the
voltage output of the module. These LEDs are not controlled by the
stored software. They light as soon as the module is connected to the
power supply. Follow the connection diagram fig. 2!
Connect the anodes (+) of the LEDs to the soldering point X2 and the
cathodes (-) to the soldering point X3.
!
Caution:
The LEDs for the front light, which are connected to the voltage output
must be operated via series resistors! Otherwise the connected LEDs
are damaged and the circuit may not work as intended.
Computation of the series resistors for the front light LEDs
In order to spare the accumulator batteries it is recommended to
restrict the input of the LEDs for the front lighting to approx. 10 mA.
This guarantees as well a sufficient brightness. In this case you can
determine the series resistor from the following formula:
R = (U
- U
B
R: necessary series resistor [Ohm]
U
: voltage at the voltage output of the circuit [V]
B
U
: forward voltage of the LED [V]
F
I: Current through the LED [A]
Example for a LED with U
R = (4,8 – 4,0) / 0,01 = 80 Ohm
As the calculated value in this example does not correspond to a
commercial resistor we choose the next lower value, that means a
resistor of 68 Ohm. The input of the LED then is ca. 12. mA.
Seite 30
) / I = (4,8 - U
F
= 4 V:
F
) / 0,01
F
FCS-3
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