arduino

Keypad op NodeMCU ESP8266

#include <Arduino.h>
#include <Keypad.h>

char keys[4][3] = { { '1', '2', '3' }, { '4', '5', '6' }, { '7', '8', '9' }, { '*', '0', '#' } };

byte rows[4] = { D1,D6,D5,D3 }; // pad pins 2,7,6,4
byte cols[3] = { D2,D0,D4 };    // pad pins 3,1,5

Keypad keypad = Keypad(makeKeymap(keys), rows, cols, 4, 3);

void setup() {
  Serial.begin(9600);
}

void loop() {
  char key = keypad.getKey();
  if (key) Serial.println(key);
}

print to thermal printer

see thermalprinter

about Timers

https://sites.google.com/site/qeewiki/books/avr-guide/timers-on-the-atmega328

i2c two Arduino's

https://www.arduino.cc/en/Tutorial/MasterWriter

TVOut etc.

MIDI input

http://www.notesandvolts.com/2012/01/fun-with-arduino-midi-input-basics.html

Pinout diagram

(::esqpm.png?direct&450|)

Serial Bus Contention: no more than one transmitting device

https://learn.sparkfun.com/tutorials/serial-communication

serial readLine

char buf[100];

bool readLine(char *buf) {
  static int index = 0;
  while (Serial.available()) {
    byte ch = Serial.read();
    buf[index] = ch;
    if (ch=='
') {
      buf[index] = 0;
      index = 0;
      return true;
    } else {
      index++;
    }
  }
  return false;
}

void update() {
  if (readLine(buf)) {
    Serial.print(buf);
    Serial.print(" ");
    Serial.println(strlen(buf));
  }
}

MACRO for printing multiple arguments with sprintf

#define ECHO(s,x...) { char buf[100]; sprintf(buf,s,x); Serial.println(buf);}

Shift registers

https://www.arduino.cc/en/Tutorial/ShiftOut

Ethernet Shield v2

http://www.arduino.org/products/arduino-ethernet-shield-2

Arduino game consoles

driver for DCcEle DCcduino UNO

http://www.wch.cn/downloads.php?name=pro&proid=178

use avr-gcc without Arduino IDE

export PATH=$PATH:/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin

Pins

http://www.arduinopassion.com/wp-content/uploads/2013/02/Arduino-uno-Pinout.png

Arduino socket server forwarding all data received on Serial port to all connected clients

https://gist.github.com/companje/cf8db122687ae99ef244

Mini USB adapter layout

http://arduino.cc/en/Main/MiniUSB

Arduino Wake-on-LAN

Arduino button matrix without resistors or multiplexer

[[https://gist.github.com/companje/f769248e4a22ad156f62|My Arduino code]]
[[https://www.youtube.com/watch?v=Wd22Gm6D2hI|Dan Nixon's youtube explanation]]

sprintf

sprintf(charBuf, "%d,%d,%d", 5,3,2);

float to char[]

dtostrf(floatVar, minStringWidthIncDecimalPoint, numVarsAfterDecimal, charBuf);

arduino mini USB

http://www.arduino.cc/en/Main/MiniUSB

SDI12

sdi12: protocol om over 1 draad half-duplex communicatie te hebben. Er is een Arduino library voor.

seeeduino atmega328 via avrdude

avrdude -cstk500v1 -b57600 -p m328p -P /dev/tty.usbserial-A600JGJZ -D -Uflash:w:Globe4D-demo-firmware.hex:i

detect arduino bootloader

if self.sendMessage([0x10, 0xc8, 0x64, 0x19, 0x20, 0x00, 0x53, 0x03, 0xac, 0x53, 0x00, 0x00]) != [0x10, 0x00]:

rotary encoders

My Encoder class with lookup table: https://gist.github.com/3049050 (based on [[http://www.circuitsathome.com/mcu/reading-rotary-encoder-on-arduino|CircuitsAtHome]]'s code)
http://www.circuitsathome.com/mcu/reading-rotary-encoder-on-arduino
http://hifiduino.wordpress.com/2010/10/20/rotaryencoder-hw-sw-no-debounce/
my version based on the info above: https://gist.github.com/3049050

terminal mode

avrdude -c usbasp -p atmega1280 -t
>> dump flash 0 512
>> dump eeprom 0 16
>> write eeprom 0 1 2 3 4
>> erase
>> d hfuse
>> d lfuse

more: http://www.nongnu.org/avrdude/user-manual/avrdude_9.html use -u to enable writing of fuses

reset fuses?

not sure

sudo avrdude -p atmega1280 -c usbasp -P usb -v  -U lfuse:w:0xef:m -U hfuse:w:0xc9:m

bootloader with avrdude

/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avrdude -C/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf -v -v -v -v -patmega1280 -cusbasp -Pusb -Uflash:w:/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/bootloaders/atmega/ATmegaBOOT_168_atmega1280.hex:i -Ulock:w:0x0F:m

AVR documentatie

http://nongnu.org/avr-libc/

coder's toolbox for storing strings in variables

http://coderstoolbox.net/string/

WiFly

zie [[wifly]]

watchdog arduino

Ik heb pas zelf een [[http://en.wikipedia.org/wiki/Watchdog_timer|watchdog timer]] gebouwd voor Arduino met de TimerOne library zie ik nu. Maar het kan ook met standaard avr functies. Zie [[http://lifeboat.co.nz/arduino/sensor_water_working_v1.pde|dit voorbeeld]].

#include <avr/wdt.h>
...
wdt_enable(WDTO_8S); //start watchdog set for max 8 seconds
...
wdt_disable(); //turn off watchdog timer - if sketch gets this far it hasn't hung

Seeeduino

Seeeduino 2.21 bevat een Atmega328 en is compatible met Arduino.
http://www.seeedstudio.com/wiki/Seeeduino_V2.2
- de baudrate voor avrdude voor dit type is 57600

locatie van arduino hex file

Op mijn mac was dit de locatie van de hex file:

cd /private/var/folders/n9/n9UpGCFsHQW0bdm5gfLoRE+++TI/-Tmp-/console4814829202509611846.tmp

Dit heb ik uitgezocht met lsof | grep -i 'tmp' (list open files).

avrdude

op windows (afkomstig uit Ultimaker marlin firmware upload.bat):

@echo off
set /p COMPORT=Which COM port to use for uploading (ex: COM5)? 
mode %COMPORT%: DTR=on > NUL
mode %COMPORT%: DTR=off > NUL
avrdude -c stk500v2 -b115200 -p atmega2560 -P %COMPORT% -D -Uflash:w:firmware.hex:i
pause

avrdude commando

./avrdude -c arduino -b115200 -p ATMEGA328P -P /dev/tty.usbmodem411 -C avrdude.conf -D -Uflash:w:firmware.hex:i

avrdude: parallel port access not available

avrdude: parallel port access not available in this configuration
avrdude: error at avrdude.conf:531: programmer type not specified

in het geval van deze melding kun je alle 'type = par' in de avrdude.conf vervangen door 'type = serbb'. Ook al gebruik je de profielen helemaal niet. Zie [[http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1288202459|deze]] forum post.