  * continuous turn servos. It also has an ADC input for checking
  * the battery level.
  *
- * To test on Linux:
- *
- * # # Assume that the ATtiny85's I2C pins are connected to the
- * # # host's I2C bus 1
- * # i2cdetect -y 1
+ * To test on Raspian:
+ *
+ * Connect the ATtiny85's I2C pins to the I2C pins on the
+ * Raspberry Pi's GPIO connector
+ *
+ * # sudo apt-get install i2c-tools
+ * # sudo raspi-config
+ * In raspi-config, enable I2C through the advanced menu.
+ *
+ * # sudo modprobe i2c-dev
+ * # sudo i2cdetect -y 1
  *      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
  * 00:          -- 04 -- -- -- -- -- -- -- -- -- -- --
  * 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

 *      Arduino Pin 12 ---> ATtiny Pin 6
 *      Arduino Pin 13 ---> ATtiny Pin 7
 *      Arduino Reset, Arduino group -> connect with 10 uF capacitor
 * 5. Burn bootloader (VERY, VERY IMPORTANT. I learned the hard way.)
 * 6. Compile and upload this program.
 */



 * 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 * 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 * 70: -- -- -- -- -- -- -- --
 *
 * If the device doesn't show up (i.e. the 04), then
 * check the connections.
 *
 * # sudo i2cget -y 1 4 0 w    ## get left servo pulse duration
 * 0x05dc                      ## 0x05dc = 1500 microsecond pulse
 *
 * # sudo i2cget -y 1 4 2 w    ## get right servopulse duration
 * 0x05dc
 *
 * # sudo i2cget -y 1 4 4 w    ## get battery voltage
 * 0x138e                      ## 0x138e = 5006 microVolts
 *
 * # sudo i2cset -y 1 4 0 1200 ## set the left servo pulse to 1200 us
 * # sudo i2cset -y 1 4 2 1500 ## set the right right pulse to 1500 us
 *
 * *** There are intermittent I2C failures. I have not tracked them down. ***
 *
 * Programming an ATtiny85 with an Arduino Uno
 *
