Tobias
LCD Backlight Analysis:
| Current/Power | blue LCD | transflective (sunlight readable) LCD |
| backlight on | 82.4mA 644mW | 251.6mA 1950.4mW |
| backlight off | 53.2mA 416.2mW | 53.2mA 416.2mW |
The LCD backlight turns out to be a real power hogger. 1950 milliWatts? Whoa!! Maybe I should read the datasheet more often..
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NO problem Tobias
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Hi David, I am using Sam Knight's PWM library
https://code.google.com/archive/p/arduino-pwm-frequency-library/downloads
Just uploaded it to my repository, just in case
https://github.com/atmelino/Arduino/tree/master/libraries/PWM
very easy to use:
pwmWrite(PWM_OUT, pulseWidth);
Fortunately, the transflective LCD is easy to read in sunlight without a backlight. I added a button to briefly turn the backlight on if necessary, but I figure most of the time you don't need a backlight at all. Thanks for the suggestion though.
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Hey Tobias, man, that's is a big energy hog. Since you are using an Arduino, how are you controlling the PWM duty cycle? Usually you can design a dimmer for the LCD backlight and have the switching frequency set to about 200 Hz and maybe control the duty cycle at 25 to 50 % duty cycle to shave some of that current down.
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