Train occupancy detection

This project is an electronic board placed under a Märklin C-Track to detect the presence of a train. The board is connected via a second bus on I2C.

RFID tags are placed under the train. The board detects the presence of the train by reading the RFID tags.

The standard NFC used is ISO/IEC 14443 Type A. The RFID tags are MIFARE Classic 1K.

TODO

• Find a connector small enough to fit under the track
• Do a schematic review
• Finish routing the board
• Add a resistive measurement on the track to detect the presence of a train
• Study feasibility of differential I2C-bus with PCA9515
• Verify antenna matching what L and impedance?
• Update antenna matching component values

Antenna matching links

• https://eds.st.com/antenna/#/
• https://eds.st.com/nfc-tuningcircuit/
• calculator.xls