Raspberry Pi running TS question
05-17-2018, 12:01 AM
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Raspberry Pi running TS question
I have a rpi B+ with the 7" touchscreen that I'm trying to install into my 96 miata. I'm using a switch to safely shut down the rpi when I turn the car off.
https://mausberry-circuits.myshopify...upply-switch-1
I can't get the rpi to boot. It flashed the multi colored screen and than shuts off. The switch requires a constant 12v, switched, and ground. I tapped the blue red wire running to the ROOM fuse for constant. Verified this with my meter. I tapped the black red wire going to the ignition for the switched 12v.
Has anyone done this before and did I miss something?
https://mausberry-circuits.myshopify...upply-switch-1
I can't get the rpi to boot. It flashed the multi colored screen and than shuts off. The switch requires a constant 12v, switched, and ground. I tapped the blue red wire running to the ROOM fuse for constant. Verified this with my meter. I tapped the black red wire going to the ignition for the switched 12v.
Has anyone done this before and did I miss something?
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05-17-2018, 05:01 PM
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Yes, the pi works fine when it’s plugged into the wall. The problems lies with the switch I got to power the pi when the car powers. The rpi can’t just have the power cut without the shutdown procedure or the pi’s sd will corrupt. So this switch will keep the pi on for a certain time. In my case 30 minutes and than shut down properly.
Im using the rasbian os. Linus bases.
I can confirm that the constant 12v and the ground are good. I’m thinking it’s the switched 12v I tapped. Maybe try I diffferent one?
Btw pretty cool concept to have the pi running with the car and having all your gauges 24/7 for 160$.
Im using the rasbian os. Linus bases.
I can confirm that the constant 12v and the ground are good. I’m thinking it’s the switched 12v I tapped. Maybe try I diffferent one?
Btw pretty cool concept to have the pi running with the car and having all your gauges 24/7 for 160$.
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05-18-2018, 10:18 AM
#5
RPI > Safety Power Down Switch > Lithium Battery > Car power
This would allow the Pi to remain on until the Lithium Battery dies but this shouldn't occur as long as you drive every so often. If the Pi does die do to the Lithium battery draining, then it still safely shuts down but otherwise, you get to skip the slow boot-up of the Pi.
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05-18-2018, 10:38 AM
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That switch I linked does exactly that. I have my pi stay on for 30 minutes so if I go into the store I don’t have to reboot. The switch is pretty hard to get since he’s never in stock. Although I’m coming to the conclusion that mine is broken. My pi get power for a few seconds when I turn the key on than just shuts off. I’ve tested all the wires going into the switch.
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05-18-2018, 11:20 AM
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Purely guessing but I'd say either switch or "dirty power". You may wanna try running some 12v capacitors to filter the power. This will ensure you get a constant 12v.
I've never installed a pi before but I have installed an in dash mitx build though. Even with a dedicated power supply it ended up needing some capacitors.
I've never installed a pi before but I have installed an in dash mitx build though. Even with a dedicated power supply it ended up needing some capacitors.
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05-18-2018, 11:32 AM
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Purely guessing but I'd say either switch or "dirty power". You may wanna try running some 12v capacitors to filter the power. This will ensure you get a constant 12v.
I've never installed a pi before but I have installed an in dash mitx build though. Even with a dedicated power supply it ended up needing some capacitors.
I've never installed a pi before but I have installed an in dash mitx build though. Even with a dedicated power supply it ended up needing some capacitors.
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05-18-2018, 12:34 PM
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Fig 20 on the wiring diagrams suggests that black/red is OFF during start but ON during run. The blue wire is ON during start AND run... and maybe that's your problem?
Here:
http://www.mellens.net/mazda/mazda_m...996_wiring.pdf
Here:
http://www.mellens.net/mazda/mazda_m...996_wiring.pdf
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05-18-2018, 03:54 PM
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I’ve moved the black red wire to the red wire by the radio.
The blue red is showing constant. Im going to reset the pi os start from scratch. If all else fails I’ll order a new switch.
The blue red is showing constant. Im going to reset the pi os start from scratch. If all else fails I’ll order a new switch.
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05-19-2018, 06:20 PM
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Ran around with the multimeter and found the problem. Ran a wire from the battery to the circuit for the 12v constant with a inline fuse. I keep it on a delay and have the pi stay on for 15 minutes so if I do a quick run to the store it doesn’t have to boot. Boot time is about 50 seconds atm.
I love having tunerstudio access for under 200$. I run a custom gauge page and can monitor all the variables I want.
I love having tunerstudio access for under 200$. I run a custom gauge page and can monitor all the variables I want.
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05-21-2018, 04:02 PM
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Ran around with the multimeter and found the problem. Ran a wire from the battery to the circuit for the 12v constant with a inline fuse. I keep it on a delay and have the pi stay on for 15 minutes so if I do a quick run to the store it doesn’t have to boot. Boot time is about 50 seconds atm.
I love having tunerstudio access for under 200$. I run a custom gauge page and can monitor all the variables I want.
I love having tunerstudio access for under 200$. I run a custom gauge page and can monitor all the variables I want.
https://www.jeffgeerling.com/blog/20...omparison-2018
also note you can overclock the SD beyond that. Might reduce boot time significantly. There are also other tricks you can do (google can help) to reduce boot times quite a bit.
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05-22-2018, 10:50 AM
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That looks pretty killer. I'm thinking something similar but maybe mounted on the top side of the dash. honestly though I REALLY like pi in place of the gauge cluster. I'd be worried about glare though and being able read it correctly...
So many ideas stirring
So many ideas stirring
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