![]() ![]() We offer dog ID tags in different shapes, styles and colors to fit your dog’s collar. At PetSmart, explore our variety of dog tag options to find the right fit for your pet. If your pup has a reliable dog tag, they can be located more quickly if they slip out of your sight and another person finds them. Once that happens, it is okay because in that part of the program, the RF reader is not checked.Dog ID tags help keep your pup safe and show off their personality. If the cat is inside and wants to go out, the proximity sensor has to detect the cat first. On a final note, if your antenna has a large range extending into the secured area, you may need to calibrate the positioning of the antenna and the proximity sensor a bit to make sure the RFreader is not activated from the inside. It is a good idea to put an enclosure around the electronics, but that will not be discussed in this instructable. If you don't want to tag the other cat, shortening the open time (smaller value for variable 'open_time') can help, although that puts the burden on the cat with access to respond faster. The values are hexadecimal which need '0x' in front of it in this programming language. You have to find the code of the tags you are using and put those values into the arrays 'goodcode' and 'badcode'. When the animal without access tries to get in, the door is locked immediately.īyte goodcode = In the final code downloadable here, I stored the value of two tags worn by the our animals, one with and one without access. Download Hall_effect.pde to test this part of the system.įinally you can add buttons to open the locks manually (see schematic). Add an LED to digital pin 7 with the appropriate resistor (used a green one with a 220 ohm resistor). ![]() Connect ground pin to the other grounds and the vcc pin to 5v. The range is about 3cm.Ĭonnect the signal pin of the Hall sensor to pin 4 and to through a 100 ohm resistor to 5v. At the closest point the sensor and magnets are 5mm apart. I have two little magnets in the door post. The sensor and wire is simply taped to the Plexiglas. ![]() I had to use thin, very flexible wire otherwise the rigidity of it would push the flap off center. I did not want to put magnets on the door because that would make it heavier, so instead I put the switch on the door and the magnets in the door post. The main reasons for choosing a Hall effect sensor were that it does not add friction, it can be covered entirely, and I also was just curious how they work. There are other solutions possible, such as mechanical/optical rotary encoders, contact sensors, beam break sensors. within the range that closing the locks makes sense. The Hall effect sensor is for detecting whether the door is in the center, i.e. In the next steps the mechanical parts and each of the modules will be discussed in detail. One of the pictures here shows the basic plan with the modules connected to the Arduino (the electronics). The system comprises several 'modules' (solenoids, RF reader, and so on). Rubber isolation strip or other soft material for padding the edges of the door and door post Hookup wire, including about 27" extra thin (26 AWG or thinner) One 6" x 9" piece of 1/8" thick Plexiglas and perhaps another piece of about 6" x 3" to mount the locks One hinge (one that moves easily but without much lateral movement, for precision) One or more magnets to activate Hall-effect sensor over a range of about 2cm Two 12V electronic cabinet locks ( Nordson electronic). About 86 feet of 24 gauge magnet wire (longer than the piece shown in the photograph) RF tag (I used these 35mm disc shaped ones) To use the custom made antenna discussed here, you need a reader that allows connecting an external antenna) 5V RF reader module ( Seeed Studio 125Khz UART or equivalent. It is not further discussed in this Instructable however. The electronics are shown without enclosure, but it is advised to put an enclosure around the electronic parts once you're done. Make sure that the edges of the door and the doorway are padded with soft material for when the tail gets caught! A few painful experiences may be enough to make the cat never want to go in there again. Most animals will quickly learn to push the flap in response to the click (lock) and the light. Going from the inside out, an infrared proximity sensor detects the presence of an animal if within about 10 inches and unlocks the door. Flap falls back, activates Hall effect sensor, and the door locksħ. Timer ensures that door stays unlocked long enough to give cat a chance to respondĦ. Cat walks up to the gate, RF tag gets read within about 4 inchesĤ. In the beginning the door is locked, cat is outsideĢ. RFID door (entering) from champenoise on Vimeo.ġ. ![]()
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