Power consumption of 3.5inch Touchscreen Shield?

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Power consumption of 3.5inch Touchscreen Shield?

Unread postby berndbausch » Mon Mar 20, 2017 12:01 pm

I consider buying an Odroid as my home server. I would normally run it headless, but the 3.5 inch touchscreen at $27 is irresistible and would be a great way to interact with the device in case of trouble.

However, I am energy-conscious and wonder how much power it draws?
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby Laokoon » Mon Mar 20, 2017 4:35 pm

Good question. I will try to measure it today evening, so we'll have real data.
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby odroid » Mon Mar 20, 2017 7:24 pm

It should be less than 0.7 watt.
But Laokoon's measuring will be really helpful. :D
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby Laokoon » Tue Mar 21, 2017 12:36 am

Ok Odroid, you overestimated it :)
According to my equipment it's only 0.2 watt. I've measured it on 5V power plug. The difference between Odroid C1+ equipped with shield only and bare one is 0.04 amps. Both measurments done on 'idle' login screen with no USB device attached and max PWM value.
Since the majority of current is being consumed by LED backlight you can set PWM to half and ignore power consumption done by the shield.
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby odroid » Tue Mar 21, 2017 1:26 am

Thank you for the measurement.
My estimation was quite wrong :oops:
The LED backlight power consumption is 90mA/3.2V typ.
So 0.2~0.3Watt should be correct as you measured.
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby mad_ady » Tue Mar 21, 2017 4:41 am

Wow, that's really low...
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby berndbausch » Tue Mar 21, 2017 8:50 am

Thumbs up!

Thanks for the two responses, both the estimation and the measurement.
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Re: Power consumption of 3.5inch Touchscreen Shield?

Unread postby Laokoon » Tue Mar 21, 2017 5:32 pm

I've done some additional test: Odroid C0 with 3.5 LCD shield, WiFi dongle (RTL8188CUS consumes up to 160 mA sending, 120 mA receiving), 1$ sound card attached, Hardkernel's 3000mAh / 3.7V.
3 hours of continous work with Rhythmbox playing music, so estimated power consumption is 1 Ah for such set.

Bare Odroid C0 (withouth battery) / C1+ ~ 0.32 Ah for 5 volt power supply.
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