As it turns out, I did have a problem with my compasses, but it was a different problem than I first suspected. I had noticed that the car often veered wildly to the left or right in certain circumstances and I became convinced that the compass tilting in turns was to blame for this behavior. The reason for this change (which I'll describe in more detail in future sections) is because I began to worry that the compass was not providing accurate reading whenever the car banked to the left, or right in turns. I also added a Sparkfun OpenLog module (visible in the right side of bottom photo.) In the upper right corner, near the wheel in the lower photo you can also see a Pololu MinIMU-9 which replaces the Honeywell HMC5883L I used in my earlier experiments with a gyro and accelerometer-stablized platform designed to compensate for compass tilt. PWM output for analog & digital circuits 3.A. five gigahertz and WiFi 802.11b/g/n WiFi module with I☬ interface 2. Let us explore the features of Arduino Mega 2560 in detail. Digital I/O Pins 54 (of which 15 provide PWM output) Analog Input Pins 16. It has the same ATmega2560 processor and pinout as the Mega 2560. The Mega2560 Pro Mini board has all the IOs of Arduino Mega2560 R3, following are the parameters. Seeeduino Mega: This board is a shrunk version of the Mega 2560 and is manufactured by Seeed Studio. Note: I did, however, have to modify the Arduino 1.0 environment to increase the buffer space allocated to the serial ports in order to reliably read the GPS sentences. In short, an Arduino Mega 2560 is a module for Arduino that can be connected to the Arduino board to create an electronic device. Arduino Mega ADK Rev3: This board is based on the Arduino Mega 2560 and adds USB host capabilities, allowing for communication with Android devices. Plus, since the ATMega 1280 has 4 hardware serial ports, it was now much easier to connect and control the dual GPS units and I even had a spare ports left to use for data logging. In addition, the larger code and RAM space available in the Mega 1280 chip pushed away worries about running out of either of those resources. This new arrangement let me mount two 1/2 size breadboards on the front edge and this gave me room to install two GPS units at once, which made some of the GPS comparison tests I describe in another section easier to do.
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