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Can you build a key charger?
Can you build a key charger?
Bmkeys full refurb
Case battery and key cut for peanuts
Case battery and key cut for peanuts
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- RickRob
- Lifer
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Can you build a key charger?
I don't recall reading any previous posts about keys failing due to lack of charge.
Over what period of time is the recommended 30 hours - monthly, weekly (daily )?
There's no way that mine is being charged for 30 hours a week, yet I have had no issues in my 3+ years of owning the Zed.
Over what period of time is the recommended 30 hours - monthly, weekly (daily )?
There's no way that mine is being charged for 30 hours a week, yet I have had no issues in my 3+ years of owning the Zed.
///M Roadster. 2007 Black/Black. Rear spoiler, whippy aerial, mud flaps and gimp-style wind deflector!
- obewan
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Can you build a key charger?
Same here, I reckon 3.5/4.0 hours a week tops on averageRickRob wrote: ↑Thu Aug 17, 2017 7:53 am I don't recall reading any previous posts about keys failing due to lack of charge.
Over what period of time is the recommended 30 hours - monthly, weekly (daily )?
There's no way that mine is being charged for 30 hours a week, yet I have had no issues in my 3+ years of owning the Zed.
Although I make sure I alternate the keys
Interesting thread though, keen to see the results
E89 2.0 SDrive MSport
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Honda CB500F.
Gone but not forgotten E85 2.0 MSport
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- Lifer
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Can you build a key charger?
I don't think I've used my 2nd key more than once a year, so will have to check it's still working. It was working last time I tried (probably before Christmas).
The 1st key is in the car for about 12 hours a week though, and is still fine after 9 years and 143,000 miles.
The 1st key is in the car for about 12 hours a week though, and is still fine after 9 years and 143,000 miles.
- ph001
- Lifer
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Can you build a key charger?
Can anybody confirm if the battery in the key fob is definitely 12V? Seems more likely it's a 3.6v lithium, in which case you would be looking at a 5v charger so the basic wireless phone chargers should work.
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Can you build a key charger?
It's definitely not 12V, but either way the supply voltage of the charger is irrelevant for an inductive charging system.
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- ph001
- Lifer
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Can you build a key charger?
Yeh, I suppose as it's really down to the turns ratio of the coil in the charger and the pickup coil in the key. But then the coupling will be so poor it might be pretty much irrelevant as long as the induced voltage on the key is above 4V or so.
- Ducklakeview
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Can you build a key charger?
Just tried my key on the wireless desktop charger here - Nada..
Mike
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Onlinejabber
- Lifer
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Can you build a key charger?
Ducklakeview wrote: ↑Thu Aug 17, 2017 11:49 amJust tried my key on the wireless desktop charger here - Nada..
Mike
I used my toothbrush charger to do mine but had to resync both keys to get it to work
Z less again
14 E89 Z4 2.0 msport grey gone now
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14 E89 Z4 2.0 msport grey gone now
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Can you build a key charger?
If you can't find a spec for the inductive charging frequency then the way to find out how to drive the coil is to stick a wire loop into a spectrum analyser and measure it next to the keyhole on the steering column. I have such equipment but I would need to find time to do it :/
Current: 06 E85 M Silbergrau
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
- Dablk
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Can you build a key charger?
Is the frequency dictated by the the coils? Or the charge going thru them? Or both?
I plan on using a s/h coil of an e46. Basoaccly the whole barrel unit. It's just how to drive it I don't understand.
Ac or dc current and how much.
I plan on using a s/h coil of an e46. Basoaccly the whole barrel unit. It's just how to drive it I don't understand.
Ac or dc current and how much.
- Dablk
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Can you build a key charger?
On the transmitter that is.
- GuidoK
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Can you build a key charger?
Neither.
The coil will pick up most frequencies but some will give a higher efficiency than others.
But as I wrote, the coil is handling a duplex signal (both the charge energy and the transponder data) so there is some active filtering.
Chances are that the coil in the key is not used for transmitting transponder data, but the coil in the lock is used for recieving it (at least, thats what BMW WDS tells us)
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- markeg
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Can you build a key charger?
+1, when my car goes into the dealer, the key is read by the dealer to retrieve service data etc.
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- buzyg
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Can you build a key charger?
In six years of week end driving. My key has always remained charged. My wife's key did lose it's marbles once. So I went through the reboot procedure with both keys, plus a couple of trips out & soon had it working fine again. It has never done it again & that key only see's the car ever few months.