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Measuring frequency based on ADC samples
I have load that initialization time to limit count in hardware.
Monday, 23 July 2012 - 10:34
Measuring frequency based on ADC samples
I'm running the sampling timer from the system clock which is 100MHz, and load its value to be 15625-1,
Monday, 23 July 2012 - 06:05
Measuring frequency based on ADC samples
this is one cycle readings from my adc -348 -313 -273 -228 -179 -130 -82 -37 7 50 92 130 168 207 246 281 315 351 384 410 415 416 422 429 431 429 422 414 407 399 388 360 328 294...
Saturday, 21 July 2012 - 14:25
Measuring frequency based on ADC samples
Quote:A simple 3 point filter on the data helps. The pivot point times 2, add in adjacent points, divide by 4. Do this with adds and shifts. Would you explain it more, or do you...
Saturday, 21 July 2012 - 14:07
Measuring frequency based on ADC samples
Quote:Consider interpolation of the near zero cross at one end I'm interpolating the near zero samples to calculate exact zero cross for two consecutive zeros. And calculate...
Saturday, 21 July 2012 - 12:49
Measuring frequency based on ADC samples
external crystal.
Saturday, 21 July 2012 - 12:12
Sampling mains?
So what do you use for protection instead of Varistor? Do you suggest that i should use a varsitor with a thermal fuse?
Wednesday, 11 July 2012 - 08:52
Sampling mains?
Quote:Have you considered transient protection? Series capacitors are not your friend I should add a parallel Varistor with the phase and null, But since the system does not need...
Tuesday, 10 July 2012 - 08:45
Sampling mains?
Quote:But now your D6 is redundant because NULL is connected to both sides of D6! (Looking at power supply) I do not get your point, I have just connected r6 end to GND not to...
Monday, 9 July 2012 - 14:24
Sampling mains?
I have connected the R6 to gnd, and it seems it's working fine.
Monday, 9 July 2012 - 11:12
Sampling mains?
Which 1k resistor is problem? How should I change the circuit? Ok, I will use two series resistors for the 680K.
Sunday, 8 July 2012 - 13:18
Is there any issue with this configuration?
thanks for your replies. I think going to buy USB chargers from alibaba is the only option!Quote:
Friday, 6 July 2012 - 07:12