Analog Devices ADXL202 2-Axis 2g Acceleration Sensor
© Brooke Clarke 2000 - 2007
There is now a Analog Devices XL330 3-axis
accelerometer. very low power & easy to interface.
see thePIC based G-Pendent web page for more.
Hardware - This is the new "A" Version ADXL202EB-232-A
There is a reset button. Provision to use Self Test (ST) at J3.
is not clear if R1,Xcap & Ycap need to be installed to use the
There is also a DB9(f) serial cable with a socket for a 4 pin 0.1"
header with pin # 3 blocked. This fits the header on the board in
only one way. The board is powered by the Computer's serial
A Microchip Technology PIC16C63A-20I/SO microcontroller is used.
There are some unused pads on the baord marked:
J1 Com Connector to supplied Cable
1 Power In -6 to -12 unregulated from computer RTS
2 Xmit Data to computer
3 Rec Data from computer
4 not used
J2 - Secondary Connector- Analog & PWM signals
1 Power In -6 to -12 Vdc
1 ADXL202 pin3 - Self Test - connecting to Vdd causes
a 0.8g acceleration
the holes for R1 are in parallel with the surface mount R6 (62.1k for 2
kHz sample rate).
X CAP & Y CAP
There are through holes for XCAP and YCAP in parallel with surface
capacitors C15 and C11 (set for 106 Hz filter cutoff).
X1 & X2 -?
a pattern of 3, 4, 3, 4 (total of 14 holes) with an outline like a
This program has the Labview source code.The 202demo.vi program did not
find the "Serial Read with Timeout.vi". It is located in:
program files\National Instruments/Labview51/EXAMPLES/instr/smplserl.llb
This program has three display modes, scren dumps shown below:
There is a choice of EB202-RS232 or EB202-RS232-A. i.e. there is now an
The CD-ROM has the following structure:
14 Feb 2006 - the Freescale MMA7260Q 3-axis Log G acceleration sensor
with programmable ranges seems to have replaced this 2-axis fixed range
202decod.pdf - the app note on decoding the PWM utput
202embed.pdf - the app note on embedding temperature with the PWM output
Accel.pdf - a sales presenation on the AD line of accelerometers and
car_app.pdf - a car alarm example
Eb232-a1 - "A" version eval board operating instructions
Installa (First 8 characters of Installation)
setup program to install the X-Analyze and LabVIEW programs
Sub folder with the LabVIEW51 runtime only software (I am using the
version of LV5.1)
202demo.vi - with the missing "Serial Read with Timeout.vi"
Ad202Eb.asm - PIC16C63A assembly source file - can use with the free
from Microchip. Unfortunatly they used a surface mount 16C63A. It would
have been much nicer if it was a socketed part. The lead pitch on a
part is 0.1" but on the surface mount part it is 0.05" so it is not
to remove the existing part and add a socket. But I will be
into how to get a socket connected so that I can burn my own 16C63A
using the Pickstart+ from Microchip Technology.
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