User talk:Nihaopaul

ark sb401010k

1.6v 86ua of current 5v @ 22k resistor is quite dim, 60k resistor is about the same but much dimmer

rtc

http://item.taobao.com/item.htm?id=18571232760

xinchejian video

street side of xinchejian, view from outside looking up, pink lights, show the enterance way and door way get the view of the windows on the streets

overview, narrated by Ricky and Minlin, "interview to xinchejian" standing, in "un"shared area, remember to say hi to hack-a-day.

Mac-hine room tour/reprap by Paul and Valentin, lio & edward appear to talk about the door lock(s)

Introduction to the Urban farming, roger or David and Jia-qi

20 second intro to our neighbors

Catch a Wednesday presentation

View of the roof as the sun is setting.. mad lighting in the soldering area.

stc digital compas mkz51

http://www.grappendorf.net/arduino/libraries/cmps03-compass-module

i2c - should be i2c but really it's spi :/

MAG1130

#include <Wire.h>

#define MAG_ADDR  0x0E //7-bit address for the MAG3110, doesn't change
int xmax, xmin, ymax, ymin, zmax,zmin = 0; //offsets
void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
  config();            // turn the MAG3110 on
}

void loop()
{
  print_values();
  delay(5);
}

void config(void)
{
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x11);              // cntrl register2
  Wire.write(0x80);              // send 0x80, enable auto resets
  Wire.endTransmission();       // stop transmitting
  
  delay(15);
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x10);              // cntrl register1
  Wire.write(1);                 // send 0x01, active mode
  Wire.endTransmission();       // stop transmitting
}


void print_values(void)
{
  
  Serial.print("x=");
  Serial.print(readx()); 
  Serial.print(",");  
  Serial.print("y=");    
  Serial.print(ready());
  Serial.print(",");       
  Serial.print("z=");    
  Serial.println(readz()); 

}


int calibrate_x(int in) {
  /* we need to calibrate it for the offset in this part of the world */
  xmax = max(xmax, in);
  xmin = min(xmin, in);

  int offset = ( (xmax + xmin) / 2  );

  return in - offset ;

}
int calibrate_y(int in) {
  /* we need to calibrate it for the offset in this part of the world */
  ymax = max(ymax, in);
  ymin = min(ymin, in);

  int offset = ( (ymax + ymin) / 2  );

  return in - offset;

}
int calibrate_z(int in) {
  /* we need to calibrate it for the offset in this part of the world */
  zmax = max(zmax, in);
  zmin = min(zmin, in);

  int offset = ( (zmax + zmin) / 2  );

  return in - offset;

}
int readx(void)
{
  int xl, xh;  //define the MSB and LSB
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x01);              // x MSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    xh = Wire.read(); // receive the byte
  }
  
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x02);              // x LSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    xl = Wire.read(); // receive the byte
  }
  
  int xout = (xl|(xh << 8)); //concatenate the MSB and LSB
  return calibrate_x(xout);
  
}

int ready(void)
{
  int yl, yh;  //define the MSB and LSB
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x03);              // y MSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    yh = Wire.read(); // receive the byte
  }
  
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x04);              // y LSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    yl = Wire.read(); // receive the byte
  }
  
  int yout = (yl|(yh << 8)); //concatenate the MSB and LSB
  return calibrate_y(yout);
  
}

int readz(void)
{
  int zl, zh;  //define the MSB and LSB
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x05);              // z MSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    zh = Wire.read(); // receive the byte
  }
  
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x06);              // z LSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    zl = Wire.read(); // receive the byte
  }
  
  int zout = (zl|(zh << 8)); //concatenate the MSB and LSB
  return calibrate_z(zout);
}