vault backup: 2026-07-11 16:59:05

Projects/Electronics/MFRC522 RFID Reader I2C.md

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+---
+active: false
+tags: project
+created: 2026-03-08 20:25
+---
+## Goal
+
+Build an I2C based MFRC522 reader. 
+
+- Use RJ45 connectors
+- Use DIP switches to set address
+## Tasks
+
+- [ ] Clone the SPI based board ➕ 2026-03-08
+- [ ] Redesign the SPI based board to be I2C ➕ 2026-03-08
+## References
+
+- [DIP Switches for Setting I2C address](https://www.ctscorp.com/Files/DataSheets/Switches/DIP-Switches/CTS-Switches-DIP-219-Series-Datasheet.pdf)
+- [DigiKey DIP switches](https://www.digikey.com/en/products/detail/cts-electrocomponents/219-5MST/223200)
+- [MFRC522 Data Sheet](https://www.nxp.com/docs/en/data-sheet/MFRC522.pdf)
+- [I2C Specification](https://www.nxp.com/docs/en/user-guide/UM10204.pdf)