potentiometer on the underside of the board. When the program has started successfully, press the
B button to proceed to the main menu. Press C or A to scroll forward or backward through the menu,
and press B to make a selection or to exit one of the demos. There are seven demos accessible from
the menu:
1.
Battery:
This demo displays the battery voltage in millivolts, which should be above 5000
(5.0 Volts) for a fully-charged set of batteries. Removing the jumper marked ADC6 will
separate the battery voltage measurement circuit from the analog input, causing the number
displayed to drop to some low value.
2.
LEDs:
Blinks the red and green user LEDs on the underside of the board. If you have
soldered in the optional user LEDs, they will also blink.
3.
Trimpot:
Displays the position of the user trimmer potentiometer, which is located on the
underside of the board, as a number between 0 and 1023. While displaying the value, this
demo also blinks the LEDs and plays a note whose frequency is a function of the current
reading. It is easiest to turn the trimpot using a 2mm flat-head screwdriver.
4.
Sensors:
Show the current readings of the IR sensors using a bar graph. Bigger bars mean
lower reflectance. Placing a reflective object such as your finger under one of the sensors will
cause the corresponding reading to drop visibly on the graph. This demo also displays “C” to
indicate that button C has an effect—press C and the IR emitters will be turned off. In indoor
lighting conditions away from bright incandescent or halogen lights, all of the sensors should
return entirely black readings with IR off. Removing the jumper marked PC5 disables control
of the emitters, causing them to always be on.
5.
Motors:
Hold down A or C to run the motor on the corresponding side, or hold down both
buttons to run both motors simultaneously. The motors will gradually ramp up to speed; in
your own programs, you can switch them on much more suddenly. Tap A or C to switch the
corresponding motor to reverse (the button letter becomes lowercase if pressing it will drive
the corresponding motor in reverse).
6.
Music:
Plays an adaptation of J. S. Bach’s Fugue in D Minor for microcontroller and piezo,
while scrolling a text display. This demonstrates the ability of the 3pi to play music in the
background.
7.
Timer:
A simple stopwatch. Press C to start or stop the stopwatch and A to reset. The
stopwatch continues to count while you are exploring the other demos.
Note:
If the 3pi receives any serial data while the demo program is waiting for a button
press from the user, it will switch into serial slave mode. See
for more
information.
Pololu 3pi Robot User’s Guide
© 2001–2019 Pololu Corporation
4. Getting Started with Your 3pi Robot
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