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Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667
Posted: 11:26am 24 Aug 2016
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Interesting, they mention 2 versions of the board.
On-board micro SD.
Sorta feel SD might need to be external for certain mounting situations.
Also noticed Geoff mentions around 500mA with a 5".
Measured what mine was drawing yesterday, with just RTC & screen,
All that was running was the pump demo.
Got 490mA on a USB ammeter.
Didn't try turning brightness down,
got side tracked by the fact that the USB Com12 wouldn't work.
Turned out the PC was shutting down the ports data service at the level of current draw.
Cheers
Phil.
WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2948
Posted: 11:41am 24 Aug 2016
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Strongly advise using a PSU rather than a computer port when using an E100 with a TFT connected (no matter what size TFT).
It is worth obtaining a Raspberry Pi official PSU - they are cheap and of decent quality; and will deliver more than enough current for a 'loaded E100 set-up.
mikeb Senior Member Joined: 10/04/2016 Location: AustraliaPosts: 176
Posted: 12:34pm 24 Aug 2016
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You could use a USB3 port if your PC has one. It is capable of much higher currents. USB2 - 500mA. USB3 - 1.9A. However, your standard USB cable is going to be marginal at best trying to supply these sort of currents. I very much doubt that you will have the full 5V, at the MM+ end, due to voltage drop within the cable.
Personally, I use an external PSU, and a purpose made cable, for things like this.
The USB, dual port, 'wall warts' (Zonker will know what that is) are ideal.There are 10 kinds of people in the world. Those that understand binary and those that don't.
Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9642
Posted: 03:37pm 24 Aug 2016
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Completely agree with mikeb on that. Especially about the USB cable and voltage-drop.
This is one of the reasons we changed the power input from a uSD connector, to a DC socket.....Smoke makes things work. When the smoke gets out, it stops!
Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667
Posted: 04:06pm 24 Aug 2016
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mikeb Senior Member Joined: 10/04/2016 Location: AustraliaPosts: 176
Posted: 07:26pm 24 Aug 2016
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That's a nice looking one Phill. Beats my LED one.
There are 10 kinds of people in the world. Those that understand binary and those that don't.
LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129
Posted: 01:14am 29 Aug 2016
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Re September SC
Sentence of the Month (sent in by a reader):
"Not only is the human species remaining at its current level of intelligence but children are still being born with no programming skills just like their parents."
Gives us oldies surrounded by the generational technology gap a good feeling.
Phrase of the Month (in editorial):
"... but really, why would we want to?"
Refers to the idea of Australia competing with Taiwan's electronics manufacturing.
The Automotive Fault Detector is an admirable project but having experienced Micromites I could never go back to a tangle of CMOS and diode OR gates.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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