Arduino / AVR

=====about Timers=====


=====i2c two Arduino’s=====


=====TVOut etc.=====

  • (PAL info) =====MIDI input=====

=====Pinout diagram===== (::esqpm.png?direct&450|)

=====Serial Bus Contention: no more than one transmitting device=====

=====serial readLine===== char buf[100];

bool readLine(char *buf) { static int index = 0; while (Serial.available()) { byte ch =; 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=====


=====Ethernet Shield v2=====


=====Arduino game consoles=====


=====driver for DCcEle DCcduino UNO=====


=====use avr-gcc without Arduino IDE===== export PATH=$PATH:/Applications/


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


=====Mini USB adapter layout=====


=====Arduino Wake-on-LAN=====

  • My code:

=====Arduino button matrix without resistors or multiplexer=====

  • [[ My Arduino code]]
  • [[ 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=====

=====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: (based on [[|CircuitsAtHome]]'s code)

* my version based on the info above:

=====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: 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/ -C/Applications/ -v -v -v -v -patmega1280 -cusbasp -Pusb -Uflash:w:/Applications/ -Ulock:w:0x0F:m 

=====AVR documentatie=====


=====coder’s toolbox for storing strings in variables=====


=====WiFly===== zie [[wifly]]

=====watchdog arduino===== Ik heb pas zelf een [[|watchdog timer]] gebouwd voor Arduino met de TimerOne library zie ik nu. Maar het kan ook met standaard avr functies. Zie [[|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 2.21 bevat een Atmega328 en is compatible met Arduino.
  • 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 [[|deze]] forum post.