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+---
+layout: download
+board_id: "challenger_rp2040_nfc"
+title: "Challenger RP2040 NFC Download"
+name: "Challenger RP2040 NFC"
+manufacturer: "Invector Labs"
+board_url:
+ - "https://ilabs.se/product/challenger-rp2040-nfc/"
+board_image: "challenger_rp2040_nfc.jpg"
+date_added: 2026-09-08
+family: rp2040
+features:
+  - USB-C
+  - Breadboard-Friendly
+  - Feather-Compatible
+  - Battery Charging
+---
+
+The Challenger RP2040 NFC is an Adafruit Feather format board based on the Raspberry Pi RP2040, with an NXP PN7150 NFC controller on board. Unlike a simple NFC tag, the PN7150 is a full reader/writer: it polls for NFC-A, NFC-B, NFC-F and NFC-V targets and speaks NCI over I2C, so CircuitPython can read and write NDEF messages on NTAG/Ultralight, MIFARE Classic, DESFire and ISO15693 tags.
+
+It shares its layout with the rest of the Challenger RP2040 family (USB-C, 8 MByte of flash, a LiPo connector and charger, and a NeoPixel), so it drops into a Feather-shaped project like any other board in the series.
+
+### Using the NFC controller
+
+The PN7150 sits on its own I2C bus, exposed as `board.NFC_SDA` and `board.NFC_SCL`, with `board.NFC_IRQ` and `board.NFC_RESET` for the interrupt and VEN lines. That bus is internal to the board and does not appear on the headers; `board.I2C()` is the separate header bus on GPIO0/GPIO1.
+
+[circuitpython-pn7150](https://github.com/TheFilipcom4607/circuitpython-pn7150) is a single-file driver for the controller that imports nothing outside the core modules. It reads NTAG/Ultralight, Mifare Classic, DESFire/ISO-DEP, ISO15693 and FeliCa, decodes and writes NDEF, and can emulate a Type 4 tag so that tapping a phone on the board opens a URL. It recognises this board's pin names, so `PN7150.from_board(board)` wires itself up:
+
+```python
+import board
+from pn7150 import PN7150
+
+nfc = PN7150.from_board(board)
+with nfc:
+    for tag in nfc.scan():
+        print(tag.type, tag.uid_hex)
+        if tag.ndef:
+            print("  ->", tag.ndef.value)
+```
+
+It is in the [CircuitPython Community Bundle](https://github.com/adafruit/CircuitPython_Community_Bundle), so `circup install pn7150` fetches it, or you can copy `pn7150.mpy` from the latest release into `CIRCUITPY/lib/`. [ElectronicCats_CircuitPython_PN7150](https://github.com/ElectronicCats/ElectronicCats_CircuitPython_PN7150) is the other driver for this chip; it covers tag detection, and its example needs `frequency` lowered from 400000 to 100000 to run here.
+
+The on-board bus has no external pull-up resistors, so this board is built with `CIRCUITPY_I2C_ALLOW_INTERNAL_PULL_UP` and `busio.I2C` enables the RP2040's internal pull-ups on it. Those are weak, so **construct the NFC bus at 100 kHz**. 400 kHz will time out. Note also that `i2c.scan()` does not list the PN7150: it ignores the zero-length write that `scan()` uses and only answers real NCI frames.
+
+### Technical details
+
+- Raspberry Pi RP2040 dual core Cortex-M0+ @ 133 MHz
+- 264 KByte SRAM, 8 MByte flash
+- NXP PN7150 NFC controller with integrated firmware, on a dedicated I2C bus
+- Reader/writer for NFC-A, NFC-B, NFC-F and NFC-V targets
+- 1 hardware I2C, 1 hardware SPI and 1 hardware UART on the headers
+- 4 x 12-bit ADC inputs
+- NeoPixel and a red user LED
+- LiPo charger and standard LiPo battery connector
+- USB-C connector
+
+The board ships without an NFC antenna. iLabs sells it as a kit with one, or you can attach your own to the antenna pads.
+
+## Purchase
+
+* [Invector Labs](https://ilabs.se/product/challenger-rp2040-nfc/)
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