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NFC/RFID

7 Posts authored by: Fred27
Fred27

LockNFC - front door

Posted by Fred27 Jun 9, 2019
I said this NFC/keypad lock was going to have a number of uses, and it is. The garage door was the easiest as all I needed to do was simulate a button press. A loftier goal was to make something that fitted my front door. There were a number of rules. It must look professional. No dangling wires or bits duct taped to the back of the door. It must be possible to still use the normal key to open the door. Any electronic failure must mean the door can be operated normally. As you can probably g ...
So, I have a number of potential locations where my NFC lock might be useful. I decided to start with the easiest - my garage door. Operating a lock is easy if the door is already motorized and I just need to simulate a button press! I did a little investigating into the door opener. The useful connections I found were: Header 1 Header 2 Ground A reference ground. I didn't check whether it was isolated from the mains earth powering the door opener. It shouldn't matter. Power There is a power out ...
Fred27

LockNFC - firmware

Posted by Fred27 May 16, 2019
Microcontroller-based hardware is just a PCB until you have some firmware running on it. Time to get it doing something. I'd already protyped both the capacitive touch keypad and the NFC reader firmware on a development board and I check that they ran together on my PCB when it came back from the fab. There was a lot of tidying up left to do.   I decide that I'd make the device battery powered. The MSP430 is designed to be low power and the locations I intended to use it weren't ideal for ...
Fred27

LockNFC - enclosure

Posted by Fred27 May 16, 2019
NFC RFID Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   It's all very well deciding that the PCB itself will be the front panel for my lock, but it will still need an enclosure. I decided that I'd tackle the simplest lock first - and that was my garage door. The reason for this is that all I have to do is simulate a button press, At worst a relay across the existin ...
NFC RFID Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   So, after waiting for the PCB to arrive from Seed, it was time to populate it, run it through the toaster oven and see if I'd made any mistakes. As usual, I struggled a bit with the QFN soldering of the TRF7970A NFC transceiver. I can never seem to get these right without using solder paste, then slapping on too ...
Fred27

LockNFC - PCB design

Posted by Fred27 Apr 28, 2019
NFC RFID Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Design requirements This PCB design is for my LockNFC project. I wanted an NFC reader that was tuned well to my NFC implant and which also included a keypad for my (unmodified) kids to use. As i started planning out the design I came up with the following features I wanted.   Use components I'm familiar with ...
Fred27

LockNFC

Posted by Fred27 Apr 23, 2019
This project involves restarting an continuing with a project that I put to one side a few months ago. It should eventually be a lock that responds to the NFC tag implanted in my left hand. Or rather, it's the template for a number of locks. Full disclosure: Whilst I'm documenting this all in one go, the PCB part of this was already done before Project 14 NFC/RFID started.   Project goals My goals for the project are: Create an NFC reader with an antenna that's well matched to a small im ...