Pico NFC Expansion is powered by RPi Pico/Pico W and comes with a 13.56 MHz frequency-based NFC Reader/Writer that may be utilised for any contactless communication project. This Github provides a getting started guide and other working details for the Pico NFC Expansion board.
- Onboard 13.56MHz NFC read/write Module
- 0.91 inch OLED
- Drag- and- drop programming using mass storage over USB
- Type C Power/UART
- Multifunction GPIO breakout supporting general I/O, UART, I2C, SPI, ADC & PWM function.
- Multi-tune Buzzer to add audio alert into the project
- Status LED for board power, and Tag Scan indication
- Multi-platform support like MicroPython, CircuitPython, and Arduino IDE.
- Comes with HID support, so the device can simulate a mouse or keyboard
- Operating voltage of pins 3.3V and board supply 5V
- Operating Frequency: 13.56MHz
- Operating current: 50mA
- Reading Distance: >50mm(The effective distance is related to the IC card and the use environment)
- Integrated Antenna
- Support Protocols: ISO14443A, ISO14443B, Sony, ISO15693, ISO18092
- Contactless cards: NTAG213, Mifare one S50, Mifare one S70, ultralight, FM11RF08
- Operating Temperature: -15°C~+55°C
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Pico W/Pico and RFID module interfacing
Pico W NFC Module Pin Function GP1 RX Serial UART connection GP0 TX Serial UART connection -
Buzzer and OLED Interfacing
Pico W Buttons Function GP20 SDA OLED Pin GP21 SCL OLED Pin GP2 Buzzer Buzzer positive -
Breakout Pins of NFC
Pico W Function BEEP NFC buzzer Pin NFC_RX NFC UART pin NFC_TX NFC UART Pin GND Supply Ground VCC Supply Positive
- Push and hold the BOOTSEL button and plug your Pico W into the USB port of your computer. Release the BOOTSEL button after your Pico is connected.
- It will mount as a Mass Storage Device called RPI-RP2.
- Drag and drop the MicroPython UF2 - ReadPi_firmware file provided in this github onto the RPI-RP2 volume. Your Pico will reboot. You are now running MicroPython on ArdiPi.
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Download Thonny IDE from Download link as per your OS and install it.
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Once done start Thonny IDE application, Connect Expansion to laptop/PC.
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Select the device at the bottom right with a suitable COM port, as shown in the below figure. You might get a different COM port.
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Write simple onboard blink Python code or Download Led blink code, then click on the green run button to make your script run on Pico.
Now that we've reached this point, you're executing your script through Thonny IDE, so if you unplug Pico, it will stop running. To run your script without using an IDE, simply power up ArdiPi and it should run your script, go to step 3. Once you have transferred your code to the ArdiPi board, to see your script running, just plug in power either way using micro USB or via Vin, both will work.
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Click on File -> Save Copy -> select Raspberry Pi Pico , Then save file as main.py
Similarly, you can add various Python code files to Pico. Also, you can try out sample codes given here in examples folder.
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But in case you want to move multiple files at one go, for example, suppose you are interested in saving the library files folder into Pico W, the below image demonstrates that
NOTE: Don't rename lib files or other files, only your main code script should be renamed as main.py for standalone execution without Thonny.
Save whatever example code file you want to try as main.py in Pico W as shown above step 3, also add related lib files with the default name. In example folder you will find demo example script code to test onboard components of Expansion like
- NFC module demo: testing onboard NFC module, buzzer and display unit of the shield. For this demo code to test you will have to add lib nfc. py
- You can also configure, read/write, etc on the NFC Module using Windows Software.
- Software download link and operational working details is available on this link go through this link for software
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Basic Communication Protocol: Data Format
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Description of bytes in the data packet:
Field Length Description Remark STX 1 0xa8 - ‘Start Byte’ – Standard control bytes. Indicates the start of a data packet SEQ1 1 Random Code Address bits are reserved for handling device addresses over 255. DADD 1 Device address is used for multiple machine communication, only address matching can be used for data communication, 0x00 and 0xFF addresses are broadcast addresses CMD 1 Command Code One byte of the command sent by the upper unit to the lower unit DATA LENGTH 2 Data length includes TIME/STATUS + DATA field The high byte comes first, the low byte comes second STATUS 1 Lower computer return status, one byte 00 means the command is executed correctly and the others are error codes TIME 1 Used for specific command time control, timeout processing, and other commands (most) the parameter is 0 DATA [0-N] 2000 Command Code One byte of the command sent by the upper unit to the lower unit It is used as command parameters when sent by the upper computer and as return data when sent by the lower computer with variable length. The maximum length is 512, and it will not be processed when it is out of range. It will reply directly/show that the command is too long and wait for the next command. BCC 1 Xor check bit, which verifies data but does not contain STX and ETX ETX 1 0xa9 - ‘Terminating byte’ – Standard control byte. Indicates the end of a data packet SYSTEM COMMANDS examples:
CMD_GetAddress (0x01)
Description: Get the device communication address Sending data：0x01 Return Data： STATUS 0x00 - OK DATA[0] Device AddressCMD_SetBaudRate ( 0x03 )
Description: Set the serial port baud rate Sending data：0x03 DATA[0] 0x00 – 9600 bps 0x01 – 19200 bps 0x02 – 38400 bps 0x03 – 57600 bps 0x04 – 76800 bps 0x05 – 115200 bps Return Data： STATUS 0x00 - OK
Checkout Manual for a detailed understanding of System and Working Commands to send module from Host and corresponding response getting from NFC Module.
The EEPROM memory is organized into pages with 4 bytes per page. The NTAG213 variant has 45 pages, the NTAG215 variant has 135 pages and the NTAG216 variant has 231 pages in total. The functionality of the different memory sections is shown below for NTAG213.
Find more details in NTAG Datasheet
- Schematic
- Hardware Files
- Step File
- MicroPython getting started for RPi Pico/Pico W
- Pico W Getting Started
- RP2040 Datasheet
- NFC Module Command Manual
- NTAG213/215/216 Datasheet
- Pico NFC Expansion - Expansion for Pico
- NFC Breakout
- Pico NFC HAT - HAT for raspberry pi
- ReadPi - An RFID/NFC Reader Powered with Raspberry Pi Pico W
- Raspberry Pi Pico RFID expansion - RFID expansion board with support to incorporate Pico/Pico W
- RFID_Breakout - RFID breakout for standalone testing and freedom to choose microcontroller as per requirement.
This is open source product. Kindly check the LICENSE.md file for more information.
Please contact support@sb-components.co.uk for technical support.
