Sensors

This magnetic bit reader uses the PCF8574 I2 C I/O chip and four reed switches. Reading the value of the PCF8574 will tell you which of the four reed switches has been activated by a magnet. I only had four reed switches - so the sensor has 16 combinations - using all eight pins on the PCF8574 will give...

Inspired by Sivan Toledo’s  IR-remote I decided to make an RFID reader for the NXT. An RFID tag is an object that wirelessly can be identified using radio waves. The most common RFID tags are ID-cards or tokens. As show on the block diagram the RFID reader uses a microcontroller (MCU) and an RFID ant...