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Changing design to get better ADC performance
Please read the datasheet on the ADC section to get your answer on ADC speed. Hint - it's a lot faster than 300uS per conversion ! The ADC is controlled by the ADC clock. Also, it...
Thursday, 26 May 2011 - 00:00
Number of byte which can be transferred by SPI connection
There's no limit to the number of bytes you can send. Transfer speed is dependant on the SPI clock speed and the amount of time in between bytes (if any). You will need to develop...
Saturday, 7 May 2011 - 13:10
Recommend me an AVR!
From a hardware feature, and pin standpoint, this series looks like a good fit. Dual USARTs, SPI, TWI communications. Timer for frequency measurements, and enough I/O left over...
Friday, 29 April 2011 - 22:05
Help! Time it takes for comparator to go from low to hi
Quote:At a guess, the comparator will take 125ns if your AVR is running @ 8MHz. No, that's now how it works. The analog comparator is an analog function that has nothing to do...
Wednesday, 27 April 2011 - 14:36
atmega ADC sampling time
Nope. 5V = 1023 (2^10 - 1) or 3FF. Shift left two bits and you get FF. You can also auto-trigger from any external interrupt source (INT0 and INT1).
Sunday, 24 April 2011 - 13:55
atmega ADC sampling time
As you've discovered, you can use the sample and hold inside the ADC to "hold" your sample for conversion even after the signal has disappeared. If you use an auto-trigger...
Sunday, 24 April 2011 - 12:58
Would these component substitutions cause failure?
First, describe what "WORKING" and "NOT WORKING" means. Second, which micro is this ? Third, I bet there is supposed to be a VCC in here somewhere.
Saturday, 23 April 2011 - 16:10
USART troubles
Why wouldn't you use the input capture function of the 16 bit timer rather than feeding the input into an interrupt pin ? Your timing will be much more accurate and repeatable...
Saturday, 23 April 2011 - 12:55
Desing of a milli volt meter. Nyquist and oversampling.
Trying to calculate an accurate RMS value from an severely undersampled signal is going to very difficult. However, if the signal is periodic, and remains stable so enough samples...
Sunday, 17 April 2011 - 15:53
Debugwire and High voltage programming
Both the factory analysis and my "gut" feelings were given. The factory analysis was inconclusive. Their best guess was a negative voltage spike on VCC. But once again, they did...
Saturday, 16 April 2011 - 20:00
Debugwire and High voltage programming
Clawson wrote: Quote:So when you connect one of these "locked" chips up to HVPP what has actually happened? Is it that neither DWEN nor SPIEN is set or something? That's the thing...
Saturday, 16 April 2011 - 16:15
Debugwire and High voltage programming
Quote:Note: There have been sporadic reports here of dW chips supposedly stuck "between dW and ISP mode" and only recoverable by HV but little concrete evidence. Unfortunately,...
Saturday, 16 April 2011 - 14:27