Acceleration

Question 1

What’s an acceleration sensor?

Answer 1

An accelerometer

Question 2

What sensor is used in self balancing? What does it measure?

Answer 2

Gyroscope; angular velocity

Question 3

The difference between acceleration and angular velocity?

Answer 3

Acceleration is rate at which an object’s velocity is changing, it is measured in g (gravity) or m/s^2, accounts for gravity
Angular velocity measures rotational speed of an object and its axis of rotation, measured in deg/sec, ignores gravity

Question 4

What is MX2125 sensor?

Answer 4

Simple two axis acceleration sensor; measure up to 3 g

Question 5

How does MX2125 sensor report acceleration?

Answer 5

As a pulse length

Question 6

What’s the 3 axis accelerometer?

Answer 6

ADXL377 (up to 300 g)

Question 7

How does MX2125 work?

Answer 7

By heating a bubble of gas in the device then measuring how the air bubble moves

Question 8

Formula to measure a Parallax accelerometer?

Answer 8

dutyCycle = tHIGH / T
A = 8(tHIGH/T-0.50)
example: consider tHIGH of 6,250 µs (6.25 ms):
A = 8(6250/10000-0.5) = 8(0.625-0.5) = 80.125 = 1 // g