# Accelerometer project

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#### kiowamec

##### New Member
I would like to build a accelerometer to measure vehicle acceleration. Problem is... I have no electronics background. Long story short. Can I use a ADXL103, three or so LM3914's and a few led bar graphs to make a low cost accelerometer?

#### ikalogic

##### Member
kiowamec said:
I would like to build a accelerometer to measure vehicle acceleration. Problem is... I have no electronics background. Long story short. Can I use a ADXL103, three or so LM3914's and a few led bar graphs to make a low cost accelerometer?
but the precision (resolution) would be very low.. to a point that the device would be realy useless, you should use an ADC....

#### kiowamec

##### New Member
I was wondering about that also. I figure I only need about a total of .6 G and with 30 bars that would give me a reolution of .02 G per bar. Does that seem adequate?

#### kiowamec

##### New Member
1 ADXL103CE-ND IC ACCELEROMETER SNGL-AXIS 8CLCC 0 13.61000 $13.61 3 LM3914N-1 IC DRIVER DOT BAR DISPLAY 18-DIP 0 2.87000$8.61
1 160-1068-ND LED BAR GRAPH 10-SEGMENT YELLOW 0 1.05000 $1.05 1 160-1067-ND LED BAR GRAPH 10-SEGMENT GREEN 0 1.05000$1.05
1 160-1066-ND LED BAR GRAPH 10-SEGMENT RED 0 1.05000 \$1.05

I would like to use a pot to adjust the upper range and another pot to adjust the lumens. If someone could recommend how to wire this up and the aditional parts I would need I would greatly appreciate it. I unfortunately only know enough to be able to follow directions. Man I hate being ignorant about stuff.

#### TrevorP

##### New Member
You know actually .6 G's are tiny...like you can get much more than that in simple everyday situations.

I don't really think it's wise for you to invent an engine before the wheel.

#### kiowamec

##### New Member
After checking more sources it seems I need around .9 g's. I could just add two more LM3914's and not use the first two except for scaling. If I am on the wrong track please explain.

As far as a small amount of g force, a vehicle with a one g launch would be extremely quick. That would be your body weight pushing you back in your seat.

#### kiowamec

##### New Member
One last bump.

Anyone know of where I could get some help with this?

#### FirefighterBlu3

##### Member
You might consider reducing the chip count by replacing some of the discreet components with a PIC. Accelerometer -> PIC A/D -> logic buffer -> LED array.

#### kiowamec

##### New Member
I would really like to do something like that but do not have ANY electronics background. I am technicaly inclined, but my knowledge is currently limited to mechanical things. Any recommendatons on how I could begin to do something like this.

#### TrevorP

##### New Member
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