Accelerometer tilt sensor

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< Analog Electronic ~ Accelerometer tilt sensor

eric

Posted: Thu Oct 05, 2006 11:35 pm Post subject: Accelerometer tilt sensor

Site Admin Joined: 01 Jan 1970 Posts: 311

An Analog Devices application
The circuit in the diagram shows how a Type ADXL05 accelerometer
can be connected to a low-cost CMOS 555 to provide a frequency
output. The component values indicated apply for a ±1 g
tilt application.
The nominal 200 mV g–1 output of the accelerometer appears
at pin 8 and is amplified ×2 to a level of 400 mV g–1 by the onboard
buffer amplifier. The 0 g bias level at pin 9 is about 1.8 V.
Capacitor C4 and resistor R3 form a 16 Hz low-pass filter to lower
noise and improve the measurement resolution.
The 555 operates as a voltage-controlled oscillator where R5,
R6 and C5 set the nominal operating frequency. The values of R5
and R6 give a duty cycle of about 50% when a +1.8 V (0 g) input
signal is applied to pin 5 of the 555. To prevent any change in frequency
owing to supply variations, the 555 operates from the
accelerometer’s +3.4 V reference rather than directly off the +5 V
supply line.
The output frequency of the circuit is determined by the charging
and discharge times set by R5, R6, and C5.
With the circuit and component values shown in the diagram,

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