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These sensors allow your quadcopter to measure it's orientation for stability.
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Logic Level Converter
Logic Level Converter
Price $1.95

If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The SparkFun logic level converter is a small device that safely steps down 5V signals to 3.3V and steps up 3.3V to 5V. This level converter also works with 2.8V and 1.8V devices. Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side. Two inputs and two outputs are provided for each side.
AttoPilot Voltage and Current Sense Breakout - 90A
AttoPilot Voltage and Current Sense Breakout - 90A
Our Price: $19.95

This is a small voltage and current sense PCB. DC current is determined by measuring a voltage drop across a pair of parallel 1 mOhm shunt resistors, then converted to a final analog voltage output by the TI INA-169. Voltage sense is accomplished by scaling to 3.3V ADC range by a precision resistor divider.
AttoPilot Voltage and Current Sense Breakout - 45A
AttoPilot Voltage and Current Sense Breakout - 45A
Our Price: $19.95

This is a small voltage and current sense PCB. DC current is determined by measuring a voltage drop across a pair of parallel shunt resistors, then converted to a final analog voltage output by the TI INA-169. Voltage sense is accomplished by scaling to 3.3V ADC range by a precision resistor divider.
AttoPilot Voltage and Current Sense Breakout - 180A
AttoPilot Voltage and Current Sense Breakout - 180A
Our Price: $19.95

This is a small voltage and current sense PCB. DC current is determined by measuring a voltage drop across a pair of parallel shunt resistors, then converted to a final analog voltage output by the TI INA-169. Voltage sense is accomplished by scaling to 3.3V ADC range by a precision resistor divider.
Ultrasonic Range Finder - Maxbotix LV-EZ4
Ultrasonic Range Finder - Maxbotix LV-EZ0
Price $29.95

This is the fantastically easy to use sensor from Maxbotix. This device has three different methods of communication.  It has an RS232 serial interface, PWM and analog output.  The sensor provides very accurate readings of 0 to 255 inches (0 to 6.45m) in 1 inch increments with little or no dead zone!  This sensor has the widest beam of the LV sensor series.  Please see beam width explanation below.
Gyro Sensor - ITG-3204
Gyro Sensor - ITG-3200
Price $49.95

This is a breakout board for InvenSense's ITG-3200, a groundbreaking triple-axis, digital output gyroscope. The ITG-3200 features three 16-bit analog-to-digital converters (ADCs) for digitizing the gyro outputs, a user-selectable internal low-pass filter bandwidth, and a Fast-Mode I2C (400kHz) interface.
9 Degrees of Freedom - Sensor Stick
9 Degrees of Freedom - Sensor Stick
Our Price: $49.95

The 9DOF Sensor stick is a very small sensor board with 9 degrees of freedom. It includes the ADXL345 accelerometer, the HMC5883L magnetometer, and the ITG-3200 gyro. The 'stick' has a simple I2C interface and a mounting hole for attaching it to your project. Also, the board is a mere 0.036" thick (0.093" overall), allowing it to be easily mounted in just about any application.
Ultrasonic Range Finder - XL-Maxsonar EZ0
Ultrasonic Range Finder - XL-Maxsonar EZ0
Price $49.95

We are extremely pleased with the size, quality, and ease of use of this little range finder. The sensor provides very accurate readings from 0 to 765cm (0 to 25.1ft) with 1cm resolution. This sensor can be powered with anywhere between 3.3 and 5VDC.
IMU Digital Combo Board - 6DOF
IMU Digital Combo Board - 6DOF
Our Price: $64.95

This is a simple breakout for the ADXL345 accelerometer and the ITG-3200 gyro. With this board, you get a full 6 degrees of freedom. The sensors communicate over I2C and one INT output pin from each sensor is broken out. If you need a simple and tiny board that gives you 6 degrees of freedom, this would be a good choice.