Sebastien Lelong wrote:
> Oh, and what about 1N4148 diode ? What's the purpose ? Make sure the circuit
> is correctly polarized ? Can a 1N4007 do the job ?
If I may jump in. The datasheets for the LCD usually say that the
backlight should be powered with 4.2 or 4.3V. Since my circuits are
usually powered with 5V I normally use *only* a Si-diode between Vdd and
the backlight pin of the LCD (1N4148 or 1N400x, and no series resistor).
That is not really a proper current limitor, but all my LCDs are still
alive.
Note: This works still OK with the PWM backlight library, with which I
use a little mosfet (BS170) between the backlight ground pin of the LCD
and ground.
Regards, Rob.
--
Rob Hamerling, Vianen, NL (http://www.robh.nl/)
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