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Hi everybody,
I try to develop digital caliper with PSoC instead of ASIC. As you know digital caliper use capacitance change for measure the displacement.
First i use TI FDC1004(capasitance to digital converter) for observe capacitance change but i can't get clear results. After that i decide to use
PSoC for produce PWM's for input and measure capacitance change. Any body help me how can i use PSoC for capacitance measurement ?
Here is the good page for understand how does digital caliper work.
http://electronics.stackexchange.com/questions/6713/how-does-an-electronic-caliper-work
Solved! Go to Solution.
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PSoC 1
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The magnitude of the C you want to address is important. If its large simple
ways to measure C with a current source and ramp the C to a V and time
that Q = C x V, I = C x dV/dT, C = ( I x dT) / dV.
If the C is quite small, a few pF to 10's of pF, a ac bridge approach may be more
appropriate to measure Z and compute C from that.
Regards, Dana.
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What is -
1) Range of C you have to measure
2) Resolution of measurement
3) Accuracy desired
Regards, Dana.
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I plan 0.5 mm resolution, but accuracy is not my first duty. First i will observe capacitance change, second with change of capasitance, i measure distance. After these steps, i think about accuracy
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The magnitude of the C you want to address is important. If its large simple
ways to measure C with a current source and ramp the C to a V and time
that Q = C x V, I = C x dV/dT, C = ( I x dT) / dV.
If the C is quite small, a few pF to 10's of pF, a ac bridge approach may be more
appropriate to measure Z and compute C from that.
Regards, Dana.