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3031  Forum 2005-2010 (read only) / Interfacing / Moving 18 servo motor on: January 30, 2010, 10:36:53 am
Hi, I am planning on making an hexapod robot based on arduino. I am thinking about the best choice to move simultaneously the 18 servos (plus tilt and pan -> 20).

Basically I need an arduino mega, or a arduino with an external motor controller.

What should I choose? Why? smiley Are there some motor controller with libraries for arduino? It's better to use just the mega? Is the mega capable of moving smootly the servos?

Thanks, I really need to figure this out!

3032  Forum 2005-2010 (read only) / Interfacing / Re: ADXL335 accelerometer troubles on: January 16, 2011, 02:07:36 pm
I am experimenting with this sensor too (the adxl335) and I never understood how to read the values correctly. I have done this, for now, with the map() function...

3033  Forum 2005-2010 (read only) / Interfacing / Re: How to solder components on protoboard on: January 15, 2011, 07:47:55 am
I use (and I think that everyone does) to have the protoboard flipped on the other side, looking at your pic. Then you can solder the components using different techniques. You could use wires if components are far the one from the other, you could use little pieces of metal wire, like legs of led or putting a lot of solder you can solder hole by hole to create the connection. F
3034  Forum 2005-2010 (read only) / Interfacing / Re: MSF Radio Time Code Signal Atomic Clock Receiver on: January 15, 2011, 06:35:52 am
Does anyone have lately tried this code? I can't get it working, nor the mem code nor the one on "gomiun" website. With this code, from the playground, I get only an infinite " ; ; " on my console...
Using pin 8 (reading the class)
3035  Forum 2005-2010 (read only) / Interfacing / Re: Read wireless Wii Nunchuck with Arduino on: February 09, 2010, 10:41:31 am
You really should post your library for the BlazePro on the PlayGround!
3036  Forum 2005-2010 (read only) / Interfacing / Re: Arduino to 384 LED display module (MCU Interface) on: April 13, 2010, 01:21:32 pm
Does the code for the GREEN matrix support up to 4 matrix?
Are there some library compatible with the green and the red matrix?
3037  Forum 2005-2010 (read only) / Interfacing / Re: 315 Mhz RF Link Kit problem on: January 29, 2010, 03:34:21 am
Good tip! I will try as soon as possible, thaks
3038  Forum 2005-2010 (read only) / Interfacing / Re: 315 Mhz RF Link Kit problem on: January 28, 2010, 05:15:35 pm
I have this kit, but I never had the time to try it. I still have a question in mind.. it is possible in your opinion to create a "duplex" connection? Fede
3039  Forum 2005-2010 (read only) / Interfacing / Re: large rgb led matrix driver on: December 10, 2009, 06:05:13 pm
I hope this can be useful. I have done a replica of this project:
wich use the "TLC5940NT 16 channel PWM constant-current LED driver" . They can be linked together with serial interface.
3040  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: December 06, 2009, 05:43:59 pm
This is my code, it's working but perhaps not perfect smiley Keep in mind that is my code there is also the part of code that is needed by my rtc.

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WProgram.h>
#include <DS1307.h>

int rtc[7];
byte data[56];
char orario[16]; //non cambiare 16 perchè per qualche motivo non va piu' niente dopo
char dataOdierna[16];
int anno;
int changeScreen = 0;
int k = 0;
int primaAccensione = 0;

#define expander 0x20  // Address with three address pins grounded (B0100000).
                     // Note that the R/W bit is not part of this address.
volatile byte count = 0;

uint8_t bell[8]  = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
uint8_t note[8]  = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
uint8_t duck[8]  = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
uint8_t retarrow[8] = {      0x1,0x1,0x5,0x9,0x1f,0x8,0x4};
LiquidCrystal_I2C lcd(expander,8,2);  // set the LCD address to 0x20 for a 16 chars and 2 line display

void setup()
  attachInterrupt(0, expanderInterrupt, CHANGE);
  lcd.init();        // initialize the lcd
  lcd.noBacklight(); // accende e spegne l'uscita sul pin 12.
                     // lcd.backlight();
                     // sink current +5V------+LED-------330Rresistor------P8574pin
  lcd.createChar(0, bell);
  lcd.createChar(1, note);
  lcd.createChar(2, clock);
  lcd.createChar(3, heart);
  lcd.createChar(4, duck);
  lcd.createChar(5, check);
  lcd.createChar(6, cross);
  lcd.createChar(7, retarrow);
  lcd.print(" System");
  lcd.setCursor(0, 1);
  lcd.print(" Ready.");
  for(int i=0; i<9; i++)  {
  for(int i=0; i<56; i++)  {


void loop()

  /*for(int i=0; i<7; i++)
   Serial.print(" ");

  //rtc[0] --> secondi
  //Tramite questo IF faccio lampeggiare il : per i secondi
  if (rtc[0]%2) {
    sprintf(orario,"%02d:%02d",rtc[2],rtc[1]); //%02d converte 9 in 09 e 32 in 32
  else {
    sprintf(orario,"%02d %02d",rtc[2],rtc[1]);
  if (changeScreen==0) {
    lcd.print(2, BYTE);
  else if (changeScreen==1) {
    lcd.print(1, BYTE);
    lcd.print(4, BYTE);
    lcd.print("hcca XX");
  if (count == 1) {
    count = 0;
    attachInterrupt(0, expanderInterrupt, LOW);
    if (primaAccensione==0) {changeScreen=0; primaAccensione++;}
    else if (k==1) { changeScreen=!changeScreen; lcd.clear(); }
    else if (k>1) { k=0; }

// display all keycodes
void displayKeyCodes(void) {
  uint8_t i = 0;
  while (1) {
    lcd.print("Codes 0x"); lcd.print(i, HEX);
    lcd.print("-0x"); lcd.print(i+8, HEX);
    lcd.setCursor(0, 1);
    for (int j=0; j<8; j++) {
      lcd.print(i+j, BYTE);

// Funzioni per interrupt da arduino
void expanderInterrupt() {    
  count = 1;

void expanderWrite(byte _data ) {

byte expanderRead() {
  byte _data;
  Wire.requestFrom(expander, 1);
  if(Wire.available()) {
    _data = Wire.receive();
  return _data;
3041  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: November 03, 2009, 06:44:54 pm
Yei! I have double checked every connection again and I have ended up with a pair of codes in output what I press my button. I was able to idendify this to change the data on my lcd screen. I have still to semplify my code but more or less is working now. I will post it as soon as possible. The code of Yot was my key in this work, thanks again! Thanks to everyone smiley

I am programming this system to sobstitute the lcd clock of my car, to have an enhanced clock and the possibility to switch visual to see the temperature of many electronics I have installed (via i2c) into.

3042  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: November 03, 2009, 09:49:58 am
I have correct the "==" typo, but my pullup resistor (10k) is from the +5v line to the INT on che PCF, I thought it was to set like this reading your post... I will change if connecting the pullup to the pin "2" on my arduino diecimila and test again tonight. I have changed the external interrupt from 5 to 0 if I can remeber exactly. I will check as soon as I came back home! Fede
3043  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: November 02, 2009, 05:05:47 pm
Thank you for discussing about this topic, I am learning many things.
By the way, still I can't undestanding I am doing it right. Following the code of Yot, in my serial debug I have
no stop (well, I have some wire attached to the expander)
When I press the button for less than one sec i have
So I can see that something change, and when I release my button I have again, over and over smiley the code inserted at the top (11001001).
Is this supposed to be correct? It will be a little tricky to hook...

3044  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: November 01, 2009, 07:16:56 pm
With the help of your code as test I have read a bit of documentation from the arduino site and now I am doing some test.
If I understand it right when I press the button, connected to ground, I receve a different binary number, so I can hook this to actions. Am I right?

Still have to test it, but can you tell me if the pin used from the arduino to the external interrupt is still usable?

3045  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: November 01, 2009, 03:26:46 pm
Hi Mario,
I have already planned not to use the backlight with your library because I will always need the backlight on. I could use the pin 12, but still I have to understand how. I am working on it...
Thanks, Fede
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