Paper-Duino-Hat


This is the latest version of the Paper-Duino-Pi. It is an Arduino Hat for the Raspberry Pi.
It has an Reset-Button (GPIO 22) and a GPIO LED (GPIO 27) on the board. The Serial connection is made over the serial GPIO pins, plus GPIO 18 for the Reset.
It works on the Raspberry Pi B+, 2 and 3.


Paper PCB

Parts

  • Atmega328p
  • 28 pin IC socket
  • 4x low current LEDs
  • crystal 16MHz
  • 2x capacitors 100nF
  • 2x capacitors 22pF
  • capacitor 68nF
  • 2x Z-diode 3.3V
  • resistors: 2x 2kOhm, 4x 1kOhm, 1x 6.8kOhm
  • 2x reset button
  • one row headers, 2×8, 2×3, 1×4
  • a 2×8 pin header

Installing the Arduino IDE

based on the code from: https://github.com/mharizanov/avrdude-rpi

Before starting make an update:

$ sudo apt-get update
$ sudo apt-get upgrade

Install the Arduino IDE:

$ sudo apt-get install arduino

In:

$ sudo raspi-config

Enable “shell and kernel messages on the serial connection” in Advanced Options/Serial.
Make a new folder:

$ mkdir paper-duino-pi
$ cd paper-duino-pi

Download the files:

$ wget http://dernulleffekt.de/programme/paperduinopi_v05/paper-duino-hat_01.tar.gz

And unpack:

$ tar -xvf paper-duino-hat_01.tar.gz

Run the setup:

$ sudo chmod 755 setup
$ sudo ./setup

Test the Serial connection:

$ ls -lh /dev

It should look like that:

crw-rw-rw- 1 root dialout 204,  64 Jul 10 20:24 ttyAMA0
lrwxrwxrwx 1 root root           7 Jul 10 20:08 ttyS0 -> ttyAMA0

Start the arduino IDE.

$ arduino

Upload your code with Arduino-Uno on the port: ttyS0.


Install the Shutdown Button and the LED

Go to your Paper-Duino-Pi folder

$ cd /home/pi/paper-duino-pi

Download the Python script:

$ wget http://www.dernulleffekt.de/programme/paperduinopi_v05/shutdown_and_blink_01.tar.gz

And unpack it:

$ tar xf shutdown_and_blink_01.tar.gz

Change owner & rights

$ sudo chown root:root shutdownbutton_hat.py blink_hat.py
$ sudo chmod 755 shutdownbutton_hat.py blink_hat.py

Create the autostart:

  $ sudo nano /etc/rc.local

Write before “exit 0”:

printf ">>>>>>>> PAPER-DUINO-HAT 07_2016 http://dernulleffekt.de\n"           

# run reset and shutdown script
printf ">>>>>>>> Starting shutdown aund reset button on GPIO 22\n"
/home/pi/paper-duino-pi/shutdownbutton_hat.py & 

# blink an LED
printf ">>>>>>>> Starting blinking LED on GPIO 27\n"
/home/pi/paper-duino-pi/blink_hat.py &

To save and leave press: CTRL+O, Enter, CTRL+X
Reboot:

$ sudo reboot

Burning the Boatloader

To burn the Boatloader on the Atmega328p chip on has to wire up the Raspberry Pi and the Paper-Duino-Pi like that:

 Raspberry Pi    |       Paper-Duino-Hat
 ======================================
 MOSI (GPIO 10)  |       MOSI (pin 11)
 MISO (GPIO 9)   |       MISO (pin 12)
 SCLK (GPIO 11)  |       SCK (pin 13)
 RST  (GPIO 25)  |       Reset
 GND             |       GND
 3.3V            |       5V

Run on the following commands:
Run the configuration menue:

 $ sudo raspi-config

Enable SPI in Advanced Options/SPI, if necessary reboot the Pi.
Now there should be an SPI device in /dev: spidev0.0 and/or spidev0.1.

 $ ls /dev

Go to:

 $ cd /usr/share/arduino/hardware/arduino/bootloaders/optiboot

Erase the chip (some chips need that):

 $ sudo avrdude -p m328p -c linuxspi -P /dev/spidev0.0 -e -F

Burn the Bootloader:

 $ sudo avrdude -p m328p -c linuxspi -P /dev/spidev0.0 -U flash:w:optiboot_atmega328.hex:i