Keyboard Shortcuts
Likes
Search
RFID in classroom AV system
|
Hello,
I was wondering if anyone out there in the ether has experimented with using say an RFID card that recalls Crestron system presents? Trying to see how simple I can make the process for a professor. Allowing them to scan a card that pulls their usual setup so they have basically nothing to think of besides their lecture. Of course we would still employ some adjustments for if there is a simple change here and there. But mainly just spitballing ideas for now. Thank you All |
¿ªÔÆÌåÓýI haven't done anything with RFID.? However, I played around with
reading NFC tags using a smart phone and tying that into a
Crestron system.? You might be able to create something where the
professors phone does a unique http call into a crestron processor
based on the NFC tag in a specific classroom.? You can see the article I wrote on NFC tags here: Hope this helps Jay On 4/17/2024 9:33 AM, tommym via
groups.io wrote:
Hello, |
|
I can help with this.? First, do you know what kind of RFID card or token is going to be used?? (Is it an existing badge that users already carry, or one where you will be passing cards or tokens out -- such as "one per preset" and... you can select the card technology)?? (if you can select the technology, you might be aware that cards come in multiple formats, including keyfobs, stickers, coin-shaped discs, or other objects, if that helps your use case)
Second, what kind of reader will be used?? Do you get to select it, or do you have to work with something that exists?? If you select it, what's the desired physical format (e.g. a wall mount similar to what you see on doors? a device that sits on a desktop?? something hidden behind another surface?? how compact would you like it?) As for how it's going to talk to Crestron, you can assume the RFID can be made to send a string to a Crestron serial port (simplest), or a TCP/UDP port (less simple since there will be a network conversion step involved).? Will you be able to work with that on the Crestron side? For what it's worth, I have an RFID chip embedded in my hand, and love making awesome integrations with it, including with Crestron.? There's lots of options! |
|
Yeah you can get them at DangerousThings.com It¡¯s sort of like a piercing and sort of like a pet chip for dogs/cats but injected into your hand. ?readable by commercially available RFID readers Hurts like hell for 5 seconds to get put in As an integrator you can do neat wizardly stuff with it.? That¡¯s sort of how I got into messing with the Arduinos, they will convert the signal from most any RFID reader to any format you want (relay closure, rs232/485, you name it), so, every size and shape of reader is an option.? Embed mini readers in furniture to unlock the drawers, put standard RFID readers on doors, or (Crestron example) bury a reader in the wall under a touchscreen that skips you past a passcode or into a hidden menu.? Mike On Thu, Apr 18, 2024 at 6:28?AM johnh via <johnh=[email protected]> wrote: Wait you have a chip embedded in your hand??? |
¿ªÔÆÌåÓýI¡¯m using HID Prox (specifically MultiClass SE readers and generally iClass SE credentials) for access control at home ¨C ESP8266s running Arduino code handle the Weigand-to-Crestron conversion because OSDP (over RS485) is problematic for me (primarily because I¡¯m cheap, but the OSDP I¡¯ve played with has tighter polling requirements than I¡¯m able to achieve without making things grumpy). ? If you¡¯re pretty much anywhere in the US that already uses a card access control system there¡¯s a very good chance it¡¯s using a HID prox technology already ¨C either 125 KHz or 13.5 MHz ¨C and generally (except for certain Corporate 1000 custom encryption keys on the 13.5 MHz iClass side of things and some ancient Motorola Indlala-based systems) a MultiClass reader is be able to read any access token in common circulation (Outside the US there are some other formats like EM4200 that MultiClass readers can read ¨C but also some that they can¡¯t) ? The bigger challenge if you¡¯re looking to reuse an existing credential is managing expiration/loss/reissuance expectations so if this is at scale you may be better off looking at integrating with the access control system (either via API or doing slightly ugly things like treating the room like an elevator where every user unlocks different ¡°floors¡± (capabilities/presets)) so that (a) you don¡¯t have to put yourself in the actual card transaction and (b) when their card is reissued (because it was lost or expired) you don¡¯t have to worry about updating the token ID on your side of things ¨C it just works (or stops working, if the card was disabled) ? If you¡¯re living in a HID 125 KHz world, HID has a 54xx series reader that outputs RS232 over one way serial. It¡¯s pretty limited (no control over the beeper or LED, just spits out the card ID that it read with a line feed IIRC. (But 125KHz is also slowly dying off for institutional use because it in its most common form it is insecure as it allows for a fairly small cardholder population) ? If you¡¯re not worried about matching an existing credential ¨C there are a plethora of EM4200 readers that output RS232 but I don¡¯t have any that I would recommend and there are the same small universe issues that make it less appealing for a new install. ? Lincoln ? -- Lincoln King-Cliby Commercial Market Director ? From: [email protected] <[email protected]> On Behalf Of
tommym via groups.io
Sent: Wednesday, April 17, 2024 11:34 AM To: [email protected] Subject: [crestron] RFID in classroom AV system ? Hello, |
|
I second the recommendation for HID Multiclass.? Enterprise quality unit and will read most anything. As you noted, needs an Arduino to convert signaling to RS232.? For anyone interested I can recommend a good board and share code to do this, you just flash the code to a brand new board once over USB, the code includes wiring directions.? I really like the brand ¡°Ruggeduino¡± for quality, and their extreme flexibility on supply voltage, and have never had one fail. ? I haven¡¯t yet dug into OSDP but I might one day.? Any time I have had polling or timing objectives to meet, I have dedicated a second Arduino chosen for its _lack_ of network support, just to that single task, and linked them via i2c or serial because you can control everything and ensure there are no competing tasks on chip.? Same idea can solve Crestron driver timing limitations.? A cooperating Arduino between Crestron and a timing sensitive device works magic, you can nail timing down to the ¦Ìs with the Arduino and relieve the Crestron driver of meeting timing burdens.? I believe that any device that multitasks or talks to a network is going to have hard limitations on meeting a strict timing spec, and yet, 8 bit arduinos are cheap, dependable, keep great timing, they boot in under 1 second, and the typical code for a single time-sensitive task often fits in a screenshot.? I treat the ESP32 and ESP8266 Arduino device as a specialist in talking to networks and I configure them to self-reboot upon any sustained degradation of network performance, and also try to avoid giving ESP¡¯s timing sensitive work.? If the other Arduino keeps the protocol state, the pair can fully recover from one¡¯s intentional rebooting.? This ¡°two-Arduino combo¡± makes for some very robust solutions that just do their job without fuss, and self-recover from temporary network or power issues really well.? Also on the other hand, for simplicity¡¯s sake, I have done installs where I skipped Arduino entirely, implemented RFID to Crestron where an access control system was already established, using established system¡¯s hardware to add one more ¡°door¡±.? But instead of powering a door strike, wired the door system¡¯s relay contact to a hard Crestron input. That solves all of the ¡°user enrollment¡± logistics ¡ª client uses their existing solution (which already supports enterprise features like scheduling, logging, and access rights) and treats the interface as though it were another ¡°door¡± that can be administered just like any other.? Crestron won¡¯t know who the user is, but depending on the use case, that may be no problem.? Mike On Thu, Apr 18, 2024 at 12:48?PM Lincoln King-Cliby via <lincoln=[email protected]> wrote:
|