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Accelerometer chips | stamps.

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polo-g40

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I'm looking at 3way accelerometers on ebay. They look simple enough but come in either bare x-y-z analogue outputs or built up i2c modules.
The aim is to make my mini-robocar balance on its end on 2 wheels. A bit like a 1dimensional segway to start with.

If I use a bare analogue module and a 16f, will it take longer to A2D convert 3 inputs than would to do an i2c read of 4bytes.? I want it to get sensor data as often as possible but keep the motor's clock as constant as possible if its going to be trying to stay with its head in the air.. Interupt handling can put the values in variables for the controlling routines for the motors to keep it as realtime as possible but I would be appreciative if someone has done this recently and can let me know of their performances and pitfalls..
Many thanks in advance

Neal :)
 

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