Security Access using MFRC522 RFID Reader with Arduino ===================================================================== This blog post shows a simple example on how to use the MFRC522 RFID reader. I’ll do a quick overview of the specifications and demonstrate a project example using an Arduino. Description RFID means radio-frequency identification. RFID uses electromagnetic fields to transfer data over short distances. RFID is useful to identify people, to make transactions, etc… You can use an RFID system to open a door. For example, only the person with the right information on his card is allowed to enter. An RFID system uses: tags attached to the object to be identified, in this example we have a keychain and an electromagnetic card. Each tag has his own identification (UID). two-way radio transmitter-receiver, the reader, that send a signal to the tag and read its response. Specifications Input voltage: 3.3V Frequency:...
Arduino Obstacle Avoiding Robot In this tutorial I will show you how to make your own obstacle avoiding robot! We will use the Arduino uno board and an ultrasonic sensor. If the robot detects an object in front of it, with the help of a small servo motor, it scans the area left and right in order to find the best way to turn. It has also a notification LED, an buzzer to play a tone when an object is detected and an button for changing the function of the robot (stopped / moving forward). It's very easy to make it! For this project you will need: Arduino UNO Computer Board Mini breadboard L298 motor driver module 2x dc motors with wheels HC-SR04 ultrasonic sensor Micro servo motor Button Red LED 220 Ohm resistor 9V battery holder (with or without power jack) 8 spacers (male-female), 8 nuts and 8 screws You will also need one big (metal) pap...
How to control different stepper motors using a rotary encoder. OVERVIEW Welcome to this multi part tutorial on how to control different stepper motors using a rotary encoder. In this first part we will use the inexpensive and popular stepper motor that comes with it’s own control board. The 28BYJ-48 stepper motor with the ULN2003 board. The 28BYJ-48 motor is not very fast or very strong, but it’s great for beginners to start experimenting with controlling a stepper motor with an Arduino. We will write some code to have the motor move in the direction that we turn the rotary encoder, and will also keep track of how much steps we have taken, so that we can have the motor move back to the starting position by pressing down on the rotary encoder switch. We are using 4 pins to control the Stepper and 3 pins for the rotary encoder module. Pin 8-11 are controlling the Stepper motor and pin 2-4 are receiving information from the rotary encoder. We c...
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