Arduino sujungimas su Raspbery

/dev/mmcblk0p2 is the root file system, so it is not easily unmounted. It could probably be re-mounted as read-only, but a simpler way is to schedule a fsck at the next reboot.

sudo touch /forcefsck

then reboot. Or reboot with

shutdown -rF now

which does the same. (from http://superuser.com/questions/401217/how-to-check-root-partition-with-fsck)

Another option of course is to do the fsck on another linux computer with a card reader.

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Kita bėda – nekokia HDMI sujungimo ekrano rezoliucija. Norėtųsi nustatyti pageidaujamą. Čia reikia koreguoti /boot/config.txt failą sekančiai:

atkomentuojame šio failo sekančias eilutes ir įrašome norimas skiriamosios gebos reikšmes, pvz. 1280 x 1024, kas atitinka 17″ ir 19″ ‘native resolution’.

framebuffer_width=1280

framebuffer_height=1024

Dabar atėjo eilė prakalbinti Arduiną pajungtą prie Raspberry per USB jungtį. Užklausus Raspberry per komandinę eilutę ‘lsusb’, gauname atsakymą:

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Bus 001 Device 007: ID 1c4f:0002 SiGma Micro Keyboard TRACER Gamma Ivory
Bus 001 Device 006: ID 046d:c06c Logitech, Inc. Optical Mouse
Bus 001 Device 005: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 004: ID 2341:8036 Arduino SA Leonardo (CDC ACM, HID)
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. LAN9500 Ethernet 10/100 Adapter / SMSC9512/9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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čia Arduino SA Leonardo yra mūsų įrenginys.

Pasinaudosime pavyzdžiu iš guglės:

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Run Python 2 on Raspberry Pi. You will find this from the menu under Programming, you should use Python 2 not 3.

Type the following after >>>

import serial
ser = serial.Serial('/dev/ttyACM0', 9600)

The first argument – /dev/ttyACM0 is the name for the USB interface used. To find out the port name, we need to run this command in terminal without Arduino plugged in:

ls /dev/tty*

Now plug in your Arduio and run the command again. If a new name appears, then this is the name of your port.

The second argument – 9600 is the baud rate and should match with what you set in the Arduino program.

Now lets start a loop listening for messages from the Arduino.

while 1 :
    ser.readline()

You will need two hit enter twice after you type the second line. Messages ‘Hi’ should now start to appear every 2 seconds. You can press Ctrl + C to stop (interrupt) the Python program.

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Mano atveju Arduino išveda į nuoseklų portą Analoginio porto reikšmę (0-1023). Arduino programa paprasta:

void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
  Serial.begin(9600);
  Serial.println(„Programos startas „);
}

void loop() {
  int x;
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  x=analogRead(A5);
  Serial.println(x);
}
Sekantis žingsnis iš Raspbery perduoti informaciją į Arduino. Tame pačiame ineto puslapyje: https://oscarliang.com/connect-raspberry-pi-and-arduino-usb-cable/