It is clearly the sun causing the problem. Some years ago I was designing
RFID readers for cow tags, I found that the tags themselves were sensitive
to sunlight! In fact, any chip that does not have sunlight positively
excluded is this meter will probably have a chip bonded to the bottom of
Is it a specific band of sunlight, such as IR, that causes the effect?
On March 18, 2015 5:18:45 AM CDT, George Tyler via EV ev@lists.evdl.org wrote:
It is clearly the sun causing the problem. Some years ago I was
designing
RFID readers for cow tags, I found that the tags themselves were
Chris Meier via EV wrote:
Is it a specific band of sunlight, such as IR, that causes the effect?
It depends on exactly what part is being affected.
Silicon devices (most ICs, transistors, and diode) are most affected by
infrared light.
LEDs are most affected by light of the same color as
https://youtu.be/xNy8IOlRkII
This is an interesting video clip, not just for the strange behavior of the
meter, but because you can REALLY tell that it's not in an EV. Wow, that is
a noisy ICE!
I suppose the meter question is peripherally related to EVs in the sense
that a meter like this
I think it would be good to experiment to find the wavelengths involved.
There was a recent dustup about the Raspberry Pi II being camera shy. It
was rebooting when photographed with a Xenon flash equipped camera. It
turned out that chip U11 was photosensitive and the fix was to put a little
Yes it was in my veggie diesel. I posted here because the guys on the diesel
list are not as savvy as the EV list concerning electronics. It's a neat gizmo
that is easier to use than the meters in our cars as it needs no wiring.
However my diesel is a solar vehicle of sorts. I run it on
If it wasn't for the possibly coincidental sunlight, I would say it looks
like an electromechanical voltage regulator in action. A regulator might
go as high as 14 and change, and when it stops charging the battery voltage
shows and is load dependent - not steady.
The change is kind of fast to
Cor van de Water wrote:
Electronic circuits (The silicon wafer that carries the transistors
and other circuitry) is affected in its operation by light.
That's a good possibility. Note that *any* semiconductor on the board
(the micro, other chips, transistors, diodes, and even LEDs) might be
From: Cor van de Water via EV ev@lists.evdl.org
Electronic circuits (The silicon wafer that carries the transistors and other
circuitry)
is affected in its operation by light.
Just use the Car Guys (from NPR) method: put some black electrical tape over
the display. Problem solved! :-)
Discussion
List ev@lists.evdl.org
Sent: Tuesday, March 17, 2015 3:08 PM
Subject: Re: [EVDL] Watch Malfunctioning meter. on YouTube
If it wasn't for the possibly coincidental sunlight, I would say it looks like
an electromechanical voltage regulator in action. A regulator might go as
high
] On Behalf Of Lawrence Rhodes via
EV
Sent: Tuesday, March 17, 2015 3:33 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Watch Malfunctioning meter. on YouTube
I suspect some sort of feedback via the LCD panel caused by sunlight. Using
Ohm's law might shed some light...I don't know how
Of Lawrence Rhodes via EV
Sent: Tuesday, March 17, 2015 3:33 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Watch Malfunctioning meter. on YouTube
I suspect some sort of feedback via the LCD panel caused by sunlight. Using
Ohm's law might shed some light...I don't know how though
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