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IO Expander

RGB LEDs

../../_images/io_board_rgb.png

The board features 4 WS2812 RGB LEDs, offering customizable control. Users can turn them on or off, change the color, adjust the brightness, switch display modes, and set the speed of changes.

  • To modify the on and off state of the RGB LEDs, true to turn on the RGB LEDs, false to turn them off.

sudo pironman5 -re true

  • To change their color, input the desired hexadecimal color values, such as fe1a1a.

sudo pironman5 -rc fe1a1a

  • To change the brightness of the RGB LED (range: 0 ~ 100%):

sudo pironman5 -rb 100

  • To switch RGB LED display modes, choose from options: solid/breathing/flow/flow_reverse/rainbow/rainbow_reverse/hue_cycle:

Note

If you set the RGB LED display mode to rainbow, rainbow_reverse, or hue_cycle, you will not be able to set the color using sudo pironman5 -rc.

sudo pironman5 -rs breathing

  • To modify the speed of change (range: 0 ~ 100%):

sudo pironman5 -rp 80

RGB Control Pin

The RGB LEDs are driven by SPI and connected to GPIO10, which is also the SPI MOSI pin. The two pins above J9 are used to connect the RGB LEDs to GPIO10. If not needed, the jumper can be removed.

../../_images/io_board_rgb_pin.png

RGB OUT Pins

../../_images/io_board_rgb_out.png

The WS2812 RGB LEDs support serial connection, allowing for the attachment of an external RGB LED strip. Connect the SIG pin to the external strip’s DIN pin for expansion.

The default setup includes 4 RGB LEDs. Connect additional LEDs and update the count using:

sudopironman5 -rl 12

OLED Screen Connector

The OLED screen connector, with an address of 0x3C, is a key feature.

../../_images/io_board_oled.png

If the OLED Screen is not displaying or displaying incorrectly, you can follow these steps to troubleshoot the issue:

Check if the FPC cable of the OLED Screen is properly connected.

  1. Use the following command to view the program’s run logs and check for error messages.

    cat /var/log/pironman5/pironman5.log

  2. Alternatively, use the following command to check if the OLED’s i2c address 0x3C is recognized:

    sudo i2cdetect -y 1

  3. If the first two steps don’t reveal any issues, try restarting the pironman5 service to see if that resolves the problem.

    sudo systemctl restart pironman5.service

Infrared Receiver

../../_images/io_board_receiver.png

  • Model: IRM-56384, operating at 38KHz.

  • Connection: The IR receiver connects to GPIO13.

  • D1: An infrared reception indicator that blinks upon signal detection.

  • J8: A pin for enabling the infrared function. By default, a jumper cap is inserted for immediate functionality. Remove the cap to free GPIO13 if the IR receiver is not in use.

To utilize the IR receiver, verify its connection and install the necessary module:

  • Test the connection:

    sudo ls /dev |grep lirc

  • Install the lirc module:

    sudo apt-get install lirc -y

  • Now, test the IR Receiver by running the following command.

    mode2 -d /dev/lirc0

  • After running the command, press a button on the remote control, and the code of that button will be printed.

RGB Fan Pins

The IO expansion board supports up to two 5V non-CPU Fans. Both fans are controlled together.

FAN1 and FAN 2 are two sets of fan pins. You need to connect the fan’s red wire to “+”, and the black wire to “-“.

../../_images/io_board_fan.png

The two pins below J9 are the enable pins for GPIO Fans. By default, a jumper is inserted on these pins, allowing control of the fans’ on and off state using GPIO6. If fan operation is not desired, the jumper can be removed to free GPIO6.

../../_images/io_board_fan_j9.png

D2 is a fan signal indicator that lights up when the fan is active.

../../_images/io_board_fan_d2.png

You can use command to configure the operating mode of the two GPIO Fans. These modes determine the conditions under which the GPIO Fans will activate.

For instance, if set to 1: Performance mode, the GPIO Fans will activate at 50°C.

sudo pironman5 -gm 3

  • 4: Quiet: The GPIO Fans will activate at 70°C.

  • 3: Balanced: The GPIO Fans will activate at 67.5°C.

  • 2: Cool: The GPIO Fans will activate at 60°C.

  • 1: Performance: The GPIO Fans will activate at 50°C.

  • 0: Always On: The GPIO Fans will always on.

If you connect the control pin of the RGB fan to different pins on the Raspberry Pi, you can use the following command to change the pin number.

sudo pironman5 -gp 18

Pin Headers

../../_images/io_board_pin_header.png

Two right-angle header connectors extend the Raspberry Pi’s GPIO, but note that the IR receiver, RGB LED, and fan occupy some pins. Remove the corresponding jumper caps to utilize these pins for other functions.

Pironman 5

Raspberry Pi 5

IR Receiver(Optional)

GPIO13

OLED SDA

SDA

OLED SCL

SCL

FAN(Optional)

GPIO6

RGB(Optional)

GPIO10

RGB(Optional)

GPIO12

RGB(Optional)

GPIO21