See detail in this post.
Posted in JeonLab mini, Modification
One of my sons has complained one day that his Wii Nunchuck didn’t work and showed it to me. The joystick was loose but all the other function seemed to be fine. So he got a new Wii Nunchuck I got my own toy. 
If you search the internet with key words, “wii nunchuck arduino,” you will find many blog posts, forum posts, and video clips. I also found those interesting posts and videos some time ago and have once tried the Arduino Duemilanove and a Wii Nunchuck and a servo motor. It just worked as it is supposed to do. Of course I had to return the Wii Nunchuck to my son at that time, but now I have my own part. Although the joystick was broken, the accelerometer and two switches, C and Z, were intact. So I started removing the broken part and unnecessary part of the PCB and switches so that only the accelerometer was left.
Separated PCB
PCB only
The right part (joystick and button switch terminals) of the PCB has been cut.
Wii Nunchuck accelerometer and JeonLab mini v1.0 (wires: Blue-GND, Green-SDA(data), Yellow-SCK(clock), Orange-+3.3V; colors have no meaning here, I just used what I could find around)
Since I’m going to supply +5V for servos, in order to provide +3.3V, I just simply attach a Zenner diode and a 100 ohm resister as shown below.
Before putting the JeonLab mini in a small blue box, an FTDI breakout board from Sparkfun was connected and my sketch (at the end of this post) was loaded.
With a simple sketch below, it works fine to move two servos 0 to 180 degrees as responses of tilted angle of the Wii Nunchuck accelerometer PCB.
Some more pictures or video will be posted soon.
Sketch (JeonLab_Nunchuck.pde)
/*
* Wiichuck_2servos
* Apr 2011, Jinseok Jeon
*
* WiiChuck data read:
* thanks to WiiChuckDemo by Tod E. Kurt,
* http://todbot.com/blog/
*/
#include
#include
#include "nunchuck_funcs.h"
Servo servoX;
Servo servoY;
float tempx=0, tempy=0;
void setup()
{
nunchuck_init();
servoX.attach(10);
servoY.attach(11);
}
void loop()
{
for (int i = 1; i {
nunchuck_get_data();
tempx += nunchuck_accelx();
tempy += nunchuck_accely();
}
tempx = map(int(tempx/50.0), 74, 166, 0, 180);
tempy = map(int(tempy/50.0), 73, 170, 0, 180);
servoX.write(tempx);
servoY.write(tempy);
tempx = 0;
tempy = 0;
}
Did you know how many liters of water we waste when we are just waiting for the water gets hot before washing your hands or taking a shower or even doing dishes?
I have a bucket in my bath tub and whenever I take a shower, turn on the water and put the shower head to it until hot water comes out so that I can save cold water. Later, this cold water can be used for flushing toilet. I found the cold water we can easily waste before shower is approximately 3-4 liters which is about the same amount the toilet flushes at a time.
Posted in Energy Saving
