GVIF for Android Auto - shimmer on screen when engine running
#1
GVIF for Android Auto - shimmer on screen when engine running
I've had a few attempts to get Android Auto onto the OEM screen via GVIF over the years and now think I have a good solution. I'm using the standard GVIF used by a few members of this forum, Crankshaft (Android Auto head unit) running on Raspberry Pi and a rotary encoder for control. I'll share more details on the build once I'm done.
I have an electrical issue that I'm hoping more expert members can help me with. When taking power for the GVIF and RPI from the same source (the unused switched 12v plug in the boot area on the left hand side) I get shimmer on the screen when switched to the RPI source (attached) a pic. It's fine when the engine isn't running or if I power the RPI from one of the 12v accessory plugs in the cabin. I'd really like to power both from the switched 12v in the boot though. What am I doing wrong?
The wiring is like this (I've tee'd power from the input of the 5v USB socket directly to the GVIF) - please don't shout at me. I'm doing my best.
12v switched --- 5v USB socket --- Raspberry Pi
12v switched ---------------------------- GVIF
Piggy backing onto these connectors for power to GVIF
I have an electrical issue that I'm hoping more expert members can help me with. When taking power for the GVIF and RPI from the same source (the unused switched 12v plug in the boot area on the left hand side) I get shimmer on the screen when switched to the RPI source (attached) a pic. It's fine when the engine isn't running or if I power the RPI from one of the 12v accessory plugs in the cabin. I'd really like to power both from the switched 12v in the boot though. What am I doing wrong?
The wiring is like this (I've tee'd power from the input of the 5v USB socket directly to the GVIF) - please don't shout at me. I'm doing my best.
12v switched --- 5v USB socket --- Raspberry Pi
12v switched ---------------------------- GVIF
Piggy backing onto these connectors for power to GVIF
Last edited by LockNumber25; 05-08-2019 at 04:48 PM.
#2
I don't have that problem, but I also used a stand-alone power supply to provide the necessary current instead of tapping from somewhere else.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
That may help, but then again it may be totally unrelated.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
That may help, but then again it may be totally unrelated.
#3
Join Date: Jan 2015
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Sounds like you need a filter on the power to the GVIF, maybe something like one of these:
https://www.amazon.com/Legacy-Noise-Suppressor-Eliminates-Interference/dp/B0007LCKZA/ref=pd_cp_107_2?pd_rd_w=0pWtZ&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=S2ZMK6KBEAFS6QZV7JRV&pd_rd_r=f9631f82-71db-11e9-88f1-c5c4d7a27c00&pd_rd_wg=5MZ5r&pd_rd_i=B0007LCKZA&psc=1&refRID=S2ZMK6KBEAFS6QZV7JRV
https://www.amazon.com/PAC-CSS12-Passive-Filter-Capacitor/dp/B000CEDZBA/ref=pd_cp_107_1?pd_rd_w=0pWtZ&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=S2ZMK6KBEAFS6QZV7JRV&pd_rd_r=f9631f82-71db-11e9-88f1-c5c4d7a27c00&pd_rd_wg=5MZ5r&pd_rd_i=B000CEDZBA&psc=1&refRID=S2ZMK6KBEAFS6QZV7JRV
https://www.amazon.com/Axxess-AX-ANR1000-Inline-Power-Filter/dp/B0049MWUMQ/ref=pd_cp_107_3?pd_rd_w=0pWtZ&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=S2ZMK6KBEAFS6QZV7JRV&pd_rd_r=f9631f82-71db-11e9-88f1-c5c4d7a27c00&pd_rd_wg=5MZ5r&pd_rd_i=B0049MWUMQ&psc=1&refRID=S2ZMK6KBEAFS6QZV7JRV
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#8
Facing the same issue in my new car.
Video of the interference (it's present if the engine is running or not).
The appearance can be improved by adjusting brightness/contrast on the GVIF but then it's pretty washed out. Really wish there was a HDMI version of the GVIF unit, the image is very 90's CRT at the moment
kj07xk mentioned power filters, had a look on Amazon UK and wasn't too sure what to go for (the selection is rubbish compared to Amazon US). Might some ferrite cores helps on the GVIF power lead? (I've ordered some just in case). I'm taking power from the spare switched outlet in boot. If a power filter is the way to go, would someone mind linking me in Amazon UK, I'm a newb at this so a bit lost as how to improve the situation.
Cheers,
Andrew.
Video of the interference (it's present if the engine is running or not).
The appearance can be improved by adjusting brightness/contrast on the GVIF but then it's pretty washed out. Really wish there was a HDMI version of the GVIF unit, the image is very 90's CRT at the moment
kj07xk mentioned power filters, had a look on Amazon UK and wasn't too sure what to go for (the selection is rubbish compared to Amazon US). Might some ferrite cores helps on the GVIF power lead? (I've ordered some just in case). I'm taking power from the spare switched outlet in boot. If a power filter is the way to go, would someone mind linking me in Amazon UK, I'm a newb at this so a bit lost as how to improve the situation.
Cheers,
Andrew.
Last edited by LockNumber25; 04-05-2021 at 12:06 PM.
#9
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#11
#12
Tried WhiteXKR's suggestion to ground black on the chassis, short cable (10cm), made no difference unfortunately. Also added ferrite cores to both ends of positive lead, also nothing changed. Then added this filter Also no difference
GVIF ground to chassis & ferrite
OEM image is perfect, GVIF is horrible. Because the OEM image is not affected I didn't check all the ground points like Cee Jay advised (other than visually, everything looks fine).
Also tried different AV in's on GVIF from the Pi, just in case. No difference. Last thing I can try is to power the RPi from a different source than the GVIF (currently both from the switched outlet in the boot). If I wanted to get power from the outlet by the ashtray, what's the best bet for getting access to the wiring? I've already got the side panel off and the trim around the gear selector.
Cheers.
GVIF ground to chassis & ferrite
OEM image is perfect, GVIF is horrible. Because the OEM image is not affected I didn't check all the ground points like Cee Jay advised (other than visually, everything looks fine).
Also tried different AV in's on GVIF from the Pi, just in case. No difference. Last thing I can try is to power the RPi from a different source than the GVIF (currently both from the switched outlet in the boot). If I wanted to get power from the outlet by the ashtray, what's the best bet for getting access to the wiring? I've already got the side panel off and the trim around the gear selector.
Cheers.
Last edited by LockNumber25; 04-06-2021 at 02:21 PM.
#13
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