Timeline for Changing the brightness on a Hitachi HD44780 LCD screen
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Mar 25, 2015 at 1:56 | comment | added | Ignacio Vazquez-Abrams | 43% is... less terrible, but still not great. | |
| Mar 25, 2015 at 1:35 | comment | added | ulidtko |
@ConnorWolf Well, if you do actually measure the rail current of an Uno running the delay-based blink sketch vs a rewrite of the same based on timer interrupts and properly deep sleeping — you'll see that sleeping the MCU is not so pointless. In my case, the numbers were something like 30 mA vs 17 mA. Still quite a drain; but your point has been invalidated by an experiment.
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| Mar 27, 2014 at 3:48 | comment | added | Ignacio Vazquez-Abrams | @Mr.Floppy: IOW, pick something else. Something with fewer pieces. | |
| Mar 27, 2014 at 3:31 | comment | added | Connor Wolf | Yep, but my point is that you can't even get meaningfully relevant power conservation on most any arduino boards, since even their vregs have horrible quiescent current (2 ma +, IIRC). Then there is the FTDI/ATmega16U2, which you can't turn off, etc.... | |
| Mar 27, 2014 at 3:30 | comment | added | Ignacio Vazquez-Abrams | Absolutely. Someone that wants to conserve every last bit of energy will design their own board and spec their components out accordingly. | |
| Mar 27, 2014 at 3:28 | comment | added | Connor Wolf | Really, if you want to actually get an arduino to be low-power, you need an arduino pro (or any other board with no onboard usb-serial), and then you'd need to put a regulator with decently low quiescent current draw on it. It's a bit involved. | |
| Mar 27, 2014 at 3:25 | comment | added | Connor Wolf | Sleeping the MCU is pointless, since the rest of the parts on a common uno consume so much power it doesn't provide any meaningful reduction in overall consumption.. | |
| Mar 27, 2014 at 3:20 | history | answered | Ignacio Vazquez-Abrams | CC BY-SA 3.0 |