User`s guide

board) to proceed to the main menu. Press the Top Button (marked PC5) or the Bottom Button (marked PC2) to

scroll forward or backward through the menu, and press the Middle Button to make a selection or to exit one of

the demos. There are nine demos accessible from the menu:

1. Analog Inputs: This demo displays voltage readings from the Orangutan SVP’s 13 analog inputs as a

bar graph. The inputs are in this order: PA7, PA6, PA5, PA4, PA3, PA2, PA1, PA0, trimpot, A, B, C, D. You

can press the top button to enable/disable the pull-up resistors on PA0—PA7.

2. Battery Voltage: This demo displays the battery voltage in millivolts.

3. Digital Inputs: This demo displays the digital readings from some of the user-accessible digital input

lines. The pull-up resistors are enabled, so each line should read 1 if they are not connected to anything. If

you connect a wire between one of these lines and ground, you should see its reading go to zero (be careful

not to cause a short circuit).

4. LEDs: Blinks the red and green user LEDs.

5. Trimpot: Displays the position of the user trimmer potentiometer, which is located in the upper left

corner 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 2 mm flat-head screwdriver.

6. Motors: Hold down the bottom or top buttons to run motors 1 or 2, respectively, 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 the bottom or top buttons to switch

the corresponding motor to reverse (the button name becomes lowercase if pressing it will drive the

corresponding motor in reverse).

7. Music: Plays a song while scrolling a text display. This demonstrates the ability of the Orangutan to play

music in the background.

8. Timer: A simple stopwatch. Press the bottom button to start or stop the stopwatch and the top button to

reset. The stopwatch continues to count while you are exploring the other demos.

9. USB: Demonstrates the USB connection between the Orangutan SVP and a computer. Plug the

Orangutan SVP in to USB. Any bytes you send on the Pololu Orangutan SVP USB Communications Port

(Section 8) will be displayed on the screen, and echoed back to the computer so you can see them in your

terminal program. The red LED indicates the state of the DTR handshaking line, and the green LED indicates

the state of the RTS handshaking line.

The source code for the demo program is included with the Pololu AVR C/C++

Library [http://www.pololu.com/docs/0J20]. After downloading and unpacking the library zip file, the demo program

can be found in the examples\atmega324p\svp-demo-program or examples\atmega1284p\svp-demo-program

directory, depending on whether you have the SVP-324 or SVP-1284.

5.c. Programming in Windows with AVR Studio

To program your Orangutan SVP’s on-board ATmega324P or ATmega1284PA microcontroller in Windows, we

recommend you download and install the following:

• WinAVR [http://winavr.sourceforge.net/]. WinAVR is a free, open-source suite of development tools for the

AVR family of microcontrollers, including the GNU C/C++ compiler for AVRs (avr-gcc). Please follow the

installation instructions on WinAVR’s website.

• AVR Studio [http://www.atmel.com/avrstudio/]: AVR Studio is a free integrated development environment

(IDE) for programming AVRs offered by Atmel. AVR Studio works with the WinAVR avr-gcc compiler

and contains built-in support for AVR ISP programming. Please follow Atmel’s installation instructions for

AVR Studio.

5. Getting Started Page 19 of 41