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keydiver
Posts: 1080
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Leaf Number: 16484
Location: Hobe Sound, Florida
Contact: Website

Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 7:55 am

According to page EVC-334 of my 2012 manual, pin #4 of the connector is +12 volts, and the other 3 pins get switched to ground by the VCM to turn on the LEDs. You could probably directly use the ground signals to control your Spark Photon, as long as you use some diodes to isolate them from the 12 volts coming through the LED's, or maybe some zeners to limit the voltage that the Spark would see.
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chris7
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Joined: Tue Apr 14, 2015 10:30 pm
Delivery Date: 15 Oct 2014

Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 9:47 am

Doh - thank you.
I'm used to ignoring the sign on the display, and the way I hold the probes. Absolutely I could have been measuring a constant 12V with LEDs that ground it. Whoops.

That's great. It is probably a constant 12V that I can use to power the circuit so I don't need to run a wire from the fuse. Or even if it's only active while the LEDs are doing something that would probably still work (maybe even better). I should be able to find a ground somewhere close.

And yes, I can use a pull-up to 3V on each of the inputs (I think the microprocessor has those internally, but maybe not low enough impedance), and a diode that lets the LED signals pull that low.

Which manual are you looking at? Is it downloadable?

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keydiver
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Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 10:09 am

I downloaded most of the 2012 manual from Nissan years ago. The EVC section is the one I got the most info from for you:
http://www.electricvehiclewiki.com/Niss ... ice_Manual
There used to be a link to the manual in another thread, but it is gone.
2012 Glacier Pearl SL - Delivered December 8, 2011
10kW Solar PV for recharging!
2006 Prius with Hymotion 5kWh PHEV upgrade
Tesla 70D | Titanium Metallic | Matte Obeche Wood Décor| All Glass Panoramic Roof
Tesla Model 3 Pre-Ordered!

User avatar
keydiver
Posts: 1080
Joined: Mon Sep 05, 2011 1:04 pm
Delivery Date: 08 Dec 2011
Leaf Number: 16484
Location: Hobe Sound, Florida
Contact: Website

Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 2:27 pm

Can you fill me in with how you plan on using the WiFi functionality of the Photon board? What are you using on the other end to receive it? Or, are you hoping to use it to log on to a public WiFi network in the area, or a peer-to-peer network connection? Just curious. :D
2012 Glacier Pearl SL - Delivered December 8, 2011
10kW Solar PV for recharging!
2006 Prius with Hymotion 5kWh PHEV upgrade
Tesla 70D | Titanium Metallic | Matte Obeche Wood Décor| All Glass Panoramic Roof
Tesla Model 3 Pre-Ordered!

ishiyakazuo
Posts: 333
Joined: Sat Mar 21, 2015 5:59 pm
Delivery Date: 20 Mar 2015
Location: Chicagoland, USA

Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 2:33 pm

chris7 wrote:Never mind garsh - I managed to attack the car with a multimeter, and found that:

1. The LED signals are 12V, so I'm going to have to do some conditioning before feeding into the microcontroller.
2. The middle column of fuses in the fuse box are all live when the car is off.

So I think I have a plan of attack. Just need to wire in a high efficiency USB charger to an always-on fuse to power the circuit at 5V (probably gut one that I already have), and to convert the LED signals to 3V with some tiny circuit I'm sure involves a diode. Hopefully this all fits in a little indentation in the dash under the LED cavity that I found.

I still need to find the right connectors though to intercept the LED signals so I don't have to solder on there or clamp onto the bare copper....

With a small rechargeable battery on the first LED (the one most likely to be on during charging) and a simple circuit to limit the voltage to battery charge level, you might be able to power your circuit from that...
2012 LEAF SL in Cayenne Red
40 mile R/T commute in Chicagoland
Leaf Spy Lite (June 2015, 22513 miles): AHr = 56.86, SOH = 86%, 393.13V, Hx = 73.55%, 924 L1/L2s, min/avg/max = 4.080 4.097 4.109 (29mV)

chris7
Posts: 11
Joined: Tue Apr 14, 2015 10:30 pm
Delivery Date: 15 Oct 2014

Re: Make my own carwings remote status upgrade

Mon Jun 08, 2015 3:48 pm

keydiver wrote:I downloaded most of the 2012 manual from Nissan years ago. The EVC section is the one I got the most info from for you:
http://www.electricvehiclewiki.com/Niss ... ice_Manual
There used to be a link to the manual in another thread, but it is gone.


Thanks. Not nice they charge for it though...

keydiver wrote:Can you fill me in with how you plan on using the WiFi functionality of the Photon board? What are you using on the other end to receive it? Or, are you hoping to use it to log on to a public WiFi network in the area, or a peer-to-peer network connection? Just curious. :D


I charge at work, where there's open wifi available, and at home, where there's my wifi available. If it just works in those two places I'm a happy camper.

ishiyakazuo wrote: With a small rechargeable battery on the first LED (the one most likely to be on during charging) and a simple circuit to limit the voltage to battery charge level, you might be able to power your circuit from that...


Yes, although I'm not sure how much power is available from that LED signal. Plus I think having a floating ground (when the LED is off) is suboptimal. Finding a piece of metal to act as ground somewhere around (the body of the car can still be trusted to be ground on the leaf, right?) shouldn't be that hard, compared to when I thought I needed to find a 12V.

I'll test max current on the 12V and LED signals to see what I'm playing with.

neohcommuter
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Leaf Number: 314514
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Re: Make my own carwings remote status upgrade

Fri Jun 30, 2017 6:32 am

Hey, keydiver et al.
Any updates? I bought a 2015 S and this feature is the one I miss from not getting the fancy nav unit.
I've been thinking of hacking a GPS tracker I have, which has a cellular radio for connection...
2015 Leaf S, came with 21,000mi and 12 bars.
2005 GEM e2 NEV
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Global Warming requires less ICE, not more!

chris7
Posts: 11
Joined: Tue Apr 14, 2015 10:30 pm
Delivery Date: 15 Oct 2014

Re: Make my own carwings remote status upgrade

Fri Jun 30, 2017 9:32 pm

Nah, I haven't had enough time to try it.

I have a 2017 base model leaf now, so it would still be a good project, but I don't think I'll get to it this year.

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