Ok I did take 2 years of electronics but unfortunately I havent needed it for a number of years now… What I would like to do is this…
I have punch pad dead bolt lock but the electronics somehow got drenched in a storm… the deadbolt mechanism and motor work fine. How would I use an RF transmitter and receiver in place of the keypad function so that as I was walking near my door it would unlock.
Is this a simple project and I’m just looking to far into it because the few products I have found on here look simple to use yet the extra pins just baffle me…
On a side not how hard would it be to use the Bluetooth module to be able to use my phone to unlock the door?
Thought I would elaborate a little and possibly make myself look even more incompetant :roll: lol… Is there any way of having the rf receiver trigger a relay as soon as it picks up the RF transmitter… Not sure if that helps any… Thanks guys!
RichBrown:
Thought I would elaborate a little and possibly make myself look even more incompetant :roll: lol… Is there any way of having the rf receiver trigger a relay as soon as it picks up the RF transmitter… Not sure if that helps any… Thanks guys!
Just a garage door opener remote receiver/button scenario. Lots of that on the market. Size and packaging are the issue.
Recently we see RF remote deadbolt locks. Z-Wave. See homeseer.com
RichBrown:
Thought I would elaborate a little and possibly make myself look even more incompetant :roll: lol… Is there any way of having the rf receiver trigger a relay as soon as it picks up the RF transmitter… Not sure if that helps any… Thanks guys!
Just a garage door opener remote receiver/button scenario. Lots of that on the market. Size and packaging are the issue.
Recently we see RF remote deadbolt locks. Z-Wave. See homeseer.com
Thanks for the info but I’m really looking to do it myself project
and I dont want a fob I have to hit any buttons, I just want the door to detect the RFID and unlock as I approach it… Any other ideas?
Okay, you don’t need to activate the switch when it detects an RF signal, you want an RFID reader. The ID-12 from SparkFun or the Parallax RFID reader will do most of the heavy lifting for you. You will need a microcontroller to read the output of the reader, compare it with a list of good ids, and fire off a relay or switch to open the door. The controller can be as simple as a PICAXE 08M or 18.
riden:
Okay, you don’t need to activate the switch when it detects an RF signal, you want an RFID reader. The ID-12 from SparkFun or the Parallax RFID reader will do most of the heavy lifting for you. You will need a microcontroller to read the output of the reader, compare it with a list of good ids, and fire off a relay or switch to open the door. The controller can be as simple as a PICAXE 08M or 18.
riden:
Okay, you don’t need to activate the switch when it detects an RF signal, you want an RFID reader. The ID-12 from SparkFun or the Parallax RFID reader will do most of the heavy lifting for you. You will need a microcontroller to read the output of the reader, compare it with a list of good ids, and fire off a relay or switch to open the door. The controller can be as simple as a PICAXE 08M or 18.
The limit for these seem to be 4-7" is there anything relatively cheap that will pick me up from 5-10ft away? or would that be different technology? Thanks
Passive RFID is limited in distance so if you are looking for something to travel greater than about 6"or7", you’d have to pick a different wireless technology. Easy enough right?
Here is where the fun starts: Power Consumption! Having something continuously transmitting or receiving takes up a lot of juice. You might be able to rig up a constant power supply to the receiver but i doubt you would want to walk around with a long…long extension cord to power the transmitter. So I would concentrate on a low power RF that was designed to run on batteries. Even though you don’t want to press any buttons I would still HEAVILY read over the Sparkfun keyfob project to help get you started.
RANeng:
Passive RFID is limited in distance so if you are looking for something to travel greater than about 6"or7", you’d have to pick a different wireless technology.
Active RFID has the range, but is more complicated and expensive as you said. Rich, if you need the longer distance, you need to find a way to have the lock send a signal to the portable key to tell it to send the coded signal. That is the basis of active RFID. This is how systems like the tollway EZ-PASS system work. It is entirely possible to have a portable device that wakes up periodically to listen for activation signals. The trick is to have a secure way of exchanging information such that a simple transmitter can’t open the door. Microchip’s KEELOQ system is one such system.
Honestly the distance isnt that big of a deal… Would it be too much to ask if someone could throw together a quick diagram, I can still read wiring diagrams LoL, of how it should be wired up ? I.E ID-12, PICAXE 08M and 9 volt relay? I have some background in programming so I will attempt to write the picprog myself. Honestly I really just need someone to start me along and the creative mind will kick in after… I certainly dont want anyone to feel I’m just asking whoever to physically do the work for me… Call it writers block so to speak… Thanks guys…
Take a look at the datasheet for the ID12. That covers about 1/3 of the circuit (RFID reader and voltage regulator). You will also need a PICAXE, a PICAXE breakout board (homebrew or purchased), and some type of transistor to drive the relay. You need to measure the current being drawn by the relay before specific recommendations can be made.
The ID21 circuit shown will blink an LED and sound a buzzer when a card is read. That can be optional, but it is nice. The PICAXE contains the list of valid cards and one of the output pins of the PICAXE will drive the transistor that will turn on the relay. You may be able to get away with a 2N3904, a 1k resistor from base to the PICAXE output pin, and a diode across the relay coil to suppress the inductive kick.
riden:
Take a look at the datasheet for the ID12. That covers about 1/3 of the circuit (RFID reader and voltage regulator). You will also need a PICAXE, a PICAXE breakout board (homebrew or purchased), and some type of transistor to drive the relay. You need to measure the current being drawn by the relay before specific recommendations can be made.
The ID21 circuit shown will blink an LED and sound a buzzer when a card is read. That can be optional, but it is nice. The PICAXE contains the list of valid cards and one of the output pins of the PICAXE will drive the transistor that will turn on the relay. You may be able to get away with a 2N3904, a 1k resistor from base to the PICAXE output pin, and a diode across the relay coil to suppress the inductive kick.
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