RFID Keyswitch

[alsmith]

I came across a link to circuit cellar 286 which as an article about rfid. Not sure how long it will be active so if it is of interest get it quick.

 

[Alan B]

No article, they just tried to sell me something.

 

[alsmith]

No article, they just tried to sell me something.

sorry, i just went off the cover. I hadn't read it yet

 

[Alan B]

Sorry for any confusion, I'm not saying there is no article, just that I didn't get to it via the link supplied, so maybe just a bad link.

 

[alsmith]

it goes to a hosting site (uploadable.ch), you need to follow the slow download link. It's still active, I just tried it.

 

[Alan B]

Took forever to download and never completed properly here. Uploadable.ch looks like a scam to force people to pay money for normal good download performance and to penalize and annoy the free user. $49.99 for 180 days of membership or 0.99 for one day trial? Wow.

I manually renamed the broken file part and it seems to be the correct pdf file.

Pretty technical article, probably not too useful for folks here. If you buy an RFID module already made most of the issues they talk about are done for you. I'd suggest giving it a pass unless you want to learn how it works at a low level and how to make your own resonant antenna.

Having said that, I find it interesting, but that's just me. Thanks.

 

[alsmith]

Yep, they try to get you pay rather than wait using the slow free way. I'll be reading it in the next few days.

 

[alsmith]

I just found this on ebay- at last a reasonable price for a ready built unit at a little over £5 / around $8
(it should go on that bits and pieces thread I can never find ).

 

[danielrlee]

I just found this on ebay- at last a reasonable price for a ready built unit at a little over £5 / around $8
(it should go on that bits and pieces thread I can never find ).

Cool. Do you have a link?

 

[alsmith]

I just found this on ebay- at last a reasonable price for a ready built unit at a little over £5 / around $8
(it should go on that bits and pieces thread I can never find ).

Cool. Do you have a link?

Sorry! I totally forgot!
http://www.ebay.co.uk/itm/Latest-Motorcycle-Bike-IC-card-Alarm-induction-invisible-lock-Immobilizer-Lock-/391001519105?pt=UK_Motorcycle_Parts&hash=item5b0981b401
http://www.ebay.co.uk/itm/Motorcycle-Bike-IC-card-Alarm-induction-invisible-lock-Immobilizer-Lock-Reliable-/351248197641?pt=UK_Motorcycle_Parts&hash=item51c8062809

 

[danielrlee]

I just found this on ebay- at last a reasonable price for a ready built unit at a little over £5 / around $8
(it should go on that bits and pieces thread I can never find ).

Cool. Do you have a link?

Sorry! I totally forgot!
http://www.ebay.co.uk/itm/Latest-Motorcycle-Bike-IC-card-Alarm-induction-invisible-lock-Immobilizer-Lock-/391001519105?pt=UK_Motorcycle_Parts&hash=item5b0981b401
http://www.ebay.co.uk/itm/Motorcycle-Bike-IC-card-Alarm-induction-invisible-lock-Immobilizer-Lock-Reliable-/351248197641?pt=UK_Motorcycle_Parts&hash=item51c8062809

I see that it works on 12v - not a problem in itself. However, will a MCU in your average BLDC controller turn on if it sees anything less than full pack voltage through the ignition wire?

 

[r3volved]

Wouldn't the intent be to trip a relay/contactor? Or alternatively boost the voltage after the unit to ignition line (if it requires full V)?

 

[amberwolf]

Or bypass the initial stage of the LVPS inside the controller, which usually outputs 12V from the incoming "ignition wire"'s pack voltage.

 

[alsmith]

If there are problems using it at our varied/variable pack voltages I'd think this limitation would be fairly easy to overcome- some of the members here really know their way round electronics as has been frequently shown. At the price of this unit even doubling, tripling ... the price is still good value if it does the job.

 

[alsmith]

ok, that switch arrived at the second attempt- the supplier sent an ugly very small t-shirt with a tartan stripe first- and I have to say don't buy one. It is on by default (when powered up) and when swiped it switches off. OK up to now but swiping again doesn't switch it on- it does nothing and you have to turn the power off then on again to get it to switch on. It's totally wrong for using as it's supposed to be used.

 

[alsmith]

I've had a little time to look at the circuit of that switch at last- it's switched using a changeover relay so it'll be possible to use it by modifying its' standard wiring a little. It's just disconnecting the common on the relay from the onboard relay and putting the supply feed to it, then using the currently unused switched output for the 'ignition' on/off line. It still means using a 12V supply (I need to work out the minimum it will switch at) for the unit itself. The unit only switches one way so needs to be disconnected from the battery to be powered off but that's easily done by wiring to a handlebar kill switch.
I guess the other relay output (on when the ignition is off as standard wiring is now) could be used for an alarm powered from 12V so it's only powered when the ignition is off. Or the wheel lock. Things are looking a bit more hopeful!

 

[LockH]

"York taxi firm "first in world" to use cycle detection software"
http://m.yorkpress.co.uk/news/14323..._world_quot__to_use_cycle_detection_software/

A YORK taxi company has become the first cab firm in the world to use safety-boosting cyclist detection technology.

That is the claim of Cycle Alert, whose Radio-frequency identification (RFID) devices have been installed in Streamline Taxis' vehicles.

Cycle Alert kits enable Streamline's drivers to detect RFID-tagged cyclists and ensure they give then enough room on the road.

8)

 

[BerkshireEbiker]

Hello everyone

I found these two items on eBay. I have a DC to DC converter. They are both 12v. I already have an existing key switch.

Here they are:
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F263342194748

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F351480136209

Thanks everyone

 

[BerkshireEbiker]

Any ideas guys

 

[Arlo1]

I might get one.