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1  Using Arduino / Sensors / High precision IMU sensors on: October 04, 2012, 11:51:52 pm
Ok, so I got an MPU6050 the other week, pretty happy with it so far. I see 400 microG per hertz as noise in the spec and I assume that's a one way to compare error between various accelerometers?! The lower the number the better. Please correct me if I'm wrong.
What's the most precise accelerometer and/or gyro below say $500? Or even something more precise, less erroneous then the MPU6050. I know there's filtering I can apply, DMPs, I'm simply talking in terms of raw unfiltered data.

Thanks!
2  Using Arduino / Project Guidance / Re: Underwater distance measurement (sonar?) on: October 04, 2012, 11:35:58 pm
Darn, I thought I actually put that in my original post. I need this to work high range. 100-150ft.
Everything I've seen so far in terms of ultrasonic sensors are limited to a few meters at best.
3  Using Arduino / Project Guidance / Underwater distance measurement (sonar?) on: October 03, 2012, 09:15:17 pm
I need to be able to measure distance underwater between two points. So I'm thinking something as simple as a sonar should work. One sends a ping the other one receives it and replies back. Is this approach feasible? Can anybody recommend sonars I can use?

Thanks!
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