I am working on a project, syncing Nintendo Nunchuk with Arduino. I found a code online for the same from http://letsmakerobots.com/node/5684
Here, is the code
#include <Wire.h>; void setup(){ Serial.begin(19200); nunchuck_setpowerpins(); nunchuck_init(); Serial.print("Nunchuck ready\n"); } void loop(){ nunchuck_get_data(); nunchuck_print_data(); delay(1000); } //======================================================================================================================================================================================================// //Do not modify!!!!!!!! //======================================================================================================================================================================================================// // // Nunchuck functions // static uint8_t nunchuck_buf[6]; // array to store nunchuck data, // Uses port C (analog in) pins as power & ground for Nunchuck static void nunchuck_setpowerpins() { #define pwrpin PORTC3 #define gndpin PORTC2 DDRC |= _BV(pwrpin) | _BV(gndpin); PORTC &=~ _BV(gndpin); PORTC |= _BV(pwrpin); delay(100); // wait for things to stabilize } // initialize the I2C system, join the I2C bus, // and tell the nunchuck we're talking to it void nunchuck_init() { Wire.begin(); // join i2c bus as master Wire.beginTransmission(0x52); // transmit to device 0x52 Wire.send(0x40); // sends memory address Wire.send(0x00); // sends sent a zero. Wire.endTransmission(); // stop transmitting } // Send a request for data to the nunchuck // was "send_zero()" void nunchuck_send_request() { Wire.beginTransmission(0x52); // transmit to device 0x52 Wire.send(0x00); // sends one byte Wire.endTransmission(); // stop transmitting } // Receive data back from the nunchuck, // returns 1 on successful read. returns 0 on failure int nunchuck_get_data() { int cnt=0; Wire.requestFrom (0x52, 6); // request data from nunchuck while (Wire.available ()) { // receive byte as an integer nunchuck_buf[cnt] = nunchuk_decode_byte(Wire.receive()); cnt++; } nunchuck_send_request(); // send request for next data payload // If we recieved the 6 bytes, then go print them if (cnt >= 5) { return 1; // success } return 0; //failure } // Print the input data we have recieved // accel data is 10 bits long // so we read 8 bits, then we have to add // on the last 2 bits. That is why I // multiply them by 2 * 2 void nunchuck_print_data() { static int i=0; int joy_x_axis = nunchuck_buf[0]; int joy_y_axis = nunchuck_buf[1]; int accel_x_axis = nunchuck_buf[2]; // * 2 * 2; int accel_y_axis = nunchuck_buf[3]; // * 2 * 2; int accel_z_axis = nunchuck_buf[4]; // * 2 * 2; int z_button = 0; int c_button = 0; // byte nunchuck_buf[5] contains bits for z and c buttons // it also contains the least significant bits for the accelerometer data // so we have to check each bit of byte outbuf[5] if ((nunchuck_buf[5] >> 0) & 1) z_button = 1; if ((nunchuck_buf[5] >> 1) & 1) c_button = 1; if ((nunchuck_buf[5] >> 2) & 1) accel_x_axis += 2; if ((nunchuck_buf[5] >> 3) & 1) accel_x_axis += 1; if ((nunchuck_buf[5] >> 4) & 1) accel_y_axis += 2; if ((nunchuck_buf[5] >> 5) & 1) accel_y_axis += 1; if ((nunchuck_buf[5] >> 6) & 1) accel_z_axis += 2; if ((nunchuck_buf[5] >> 7) & 1) accel_z_axis += 1; Serial.print(i,DEC); Serial.print("\t"); Serial.print("joy:"); Serial.print(joy_x_axis,DEC); Serial.print(","); Serial.print(joy_y_axis, DEC); Serial.print(" \t"); Serial.print("acc:"); Serial.print(accel_x_axis, DEC); Serial.print(","); Serial.print(accel_y_axis, DEC); Serial.print(","); Serial.print(accel_z_axis, DEC); Serial.print("\t"); Serial.print("but:"); Serial.print(z_button, DEC); Serial.print(","); Serial.print(c_button, DEC); Serial.print("\r\n"); // newline i++; } // Encode data to format that most wiimote drivers except // only needed if you use one of the regular wiimote drivers char nunchuk_decode_byte (char x) { x = (x ^ 0x17) + 0x17; return x; } // returns zbutton state: 1=pressed, 0=notpressed int nunchuck_zbutton() { return ((nunchuck_buf[5] >> 0) & 1) ? 0 : 1; // voodoo } // returns zbutton state: 1=pressed, 0=notpressed int nunchuck_cbutton() { return ((nunchuck_buf[5] >> 1) & 1) ? 0 : 1; // voodoo } // returns value of x-axis joystick int nunchuck_joyx() { return nunchuck_buf[0]; } // returns value of y-axis joystick int nunchuck_joyy() { return nunchuck_buf[1]; } // returns value of x-axis accelerometer int nunchuck_accelx() { return nunchuck_buf[2]; // FIXME: this leaves out 2-bits of the data } // returns value of y-axis accelerometer int nunchuck_accely() { return nunchuck_buf[3]; // FIXME: this leaves out 2-bits of the data } // returns value of z-axis accelerometer int nunchuck_accelz() { return nunchuck_buf[4]; // FIXME: this leaves out 2-bits of the data } When I write, Serial.Println("End"), in the line after Wire.endTransmission(); in function nunchuck_init(), it does not display on Serial Monitor.
Also, it does not display Nunchuck ready on Serial Monitor since it is written after nunchuck_init() has been called. I am working on Arduino 0023, Windows 7.