My Toy...
During my placement year, I want to play with as much hardware as I can. So after paycheck #2 came in, I went and spent some money!
Most of the items I bought are related to the RC Car idea I have had for my final year project. Read More
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Shopping List

Nearly everything was ordered from SparkFun. They are a fantastic bunch, it's only a shame they are in the US, not England!
The main components bring you to about £120.


Analog I/O

All 3 axis of the gyros are connected directly to the Arduino analog pins 0, 1 and 2.
The light sensor is connected to analog pin 4.

Digital I/O

The red, green and blue are controlled by 3 of the Arduino PWM outputs on the digital lines 9, 10 and 11.
3 of the 4 white LEDs are controllable via the other PWM outputs of the Arduino 3, 5 and 6.
The fourth white LED is controlled by an XBee PWM output.

I2C

@ 0x1D- 3-axis accelerometer
@ 0x50- EEPROM 0
@ 0x51- EEPROM 1
@ 0x52- EEPROM 2
@ 0x53- EEPROM 3
@ 0x20- I/O Expander

I/O Expander

As the IC can only really sink current, a LOW output turns the LEDs on.
The outputs are in 3-state at power on, with a pull-up resistor taking the outputs high.
Outputs should be set to high before they are used as an input.
If a logic 1 is applied to an I/O pin that was written to low, a large current flows to GND.

Side 0 (first byte)

@ 00- Edge LED (0 is on)
@ 01- LED (0 is on)
@ 02- LED (0 is on)
@ 03- LED (0 is on)
@ 04- LED (0 is on)
@ 05- LED (0 is on)
@ 06- LED (0 is on)
@ 07- LED (0 is on)

Side 1 (second byte)

@ 10- EEPROM 0 Write Protect (1 = protect)
@ 11- EEPROM 1 Write Protect (1 = protect)
@ 12- EEPROM 2 Write Protect (1 = protect)
@ 13- EEPROM 3 Write Protect (1 = protect)
@ 14- 3-axis Accelerometer INT1 (1 = interrupt)
@ 15- 3-axis Accelerometer INT2 (1 = interrupt)
@ 16- Pitch / Roll Gyro power down (1 = power down)
@ 17- Yaw Gyro power down (1 = power down)

Results

So far I have had a little play with everything.

Wireless programming (thanks ladyada) is now working!
I needed to set T3 to 1 on the XBee inside my toy in order to get this working - yay!