dduardo said:I found the part I needed. It is the ADXL322 from Analog Devices.
http://www.analog.com/en/prod/0,2877,ADXL322,00.html
"The ADXL322 is an ultra small package (4 x 4 x 1.45 mm LFCSP) and low power (340 µA at Vs = 2.4V) ± 2g iMEMS® Accelerometer designed to accommodate the integration requirements of mobile phones and other portable devices for a variety of motion, tilt, and inertial sensing features (e.g., data entry, menu and display control, power management, situational awareness, navigation, and portrait vs. landscape display orientation). The ADXL322 also enables hard disk drive protection systems and security features in notebook computers, as well as position and tilt sensing for PC and gaming peripherals such as mouse and joystick devices."
It is also cheap: $8.33 at digikey
A Solid-State Inclinometer is a type of sensor that measures the angle or tilt of an object in relation to the force of gravity. It uses solid-state technology, typically microelectromechanical systems (MEMS), to detect changes in acceleration and determine the inclination angle.
A Solid-State Inclinometer works by using a small mass that is suspended by springs inside a tiny chip. When the chip is tilted, the mass moves and changes the capacitance between the mass and the springs. This capacitance change is measured and converted into an angle reading by the sensor's electronics.
Compared to traditional mechanical inclinometers, Solid-State Inclinometers have several advantages. They are smaller in size, more accurate, and have a longer lifespan due to the absence of moving parts. They are also less affected by external factors such as temperature and vibrations, making them more reliable for precise measurements.
Solid-State Inclinometers have a wide range of applications in various industries. They are commonly used in construction, civil engineering, mining, and aerospace for monitoring the slope stability of structures, measuring the angle of drilling equipment, and guiding the orientation of satellites, among others.
When choosing a Solid-State Inclinometer, consider factors such as the required measurement range, accuracy, and environmental conditions of your application. You should also ensure that the sensor has the necessary output and communication options for your system. Consulting with a sensor expert can also help you select the best inclinometer for your specific needs.