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I am making a project with 3 arduinos (2 slave, 1 master) and I want to know can I use the mpu6050 since it uses the I2c communication.
Yes, but only from the master. You have one I2C bus with three slave devices on it - two arduinos and one mpu6050.
You can but keep the I2C wires less then about 30cm. If they are going to be further apart consider something like RS485 or CAN. Are you sure you need three?
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