Hello ketoil,Question 1:You should be looking for a 3 axis accelerometer. Since you are only using one to measure tilt. You dont need to get a more expensive, high precision/high load accelerometer. A small simple accelerometer should suffice.(eg. this simple one is 5 bucks http://www.dfrobot.com/index.php?route=product/product&product_id=1085, tho you could spend as much money as you want on a higher precision sensor, its up to you.)Question 2:You are in luck, because arduino Uno's have 6PWM pins, which means they cant directly control up to 6 servos independently without any modifications, at the same time. These pins are denoted by the ~ sign next to the output pin numbers. If the sensor you use sends information via I2C, then the arduino will read the sensor using the A4 and A5 analogue pins.If you ever need to power more than 6 servos independently at a time, you could look into multi-channel servo drivers. (eg. http://www.adafruit.com/product/815).The accelerometer measures acceleration, and gravity will be measured as an acceleration towards the ground.A 3 axis accelerometer will measure acceleration in 3 dimensions (imagine an x,y,z plane) and when the accelerometer is not moving, the measured (x,y,z) values will always give you to a vector pointing towards the ground. (if your accelerometer is upright, you will measure a vector pointing straight down. If it is upside down, you will measure a vector pointing straight up.)Using mathematics, you will be able to use this information to calculate orientation and measure tilt.Hope that helps,StefL
Hello ketoil,Question 1:You should be looking for a 3 axis accelerometer. Since you are only using one to measure tilt. You dont need to get a more expensive, high precision/high load accelerometer. A small simple accelerometer should suffice.StefL
From what I learned, accelerometer + gryo sensors may be better for orientation sensing. I recently purchased a MPU9150 device which has 3-axis accelerometer, 3-axis gyro and 3-axis compass and has adjustable sensitivity range. I still haven't figure out how to use it properly yet. The maths for calculating tilt is more complex than I expected.