Post Created date
Sin wave generator
I took it as weekend challenge ! Try to do it with small cost and good accuracy. Use a TINY2313 and clock it with 16MHz crystal. If we dont want to use an external DAC we only...
Sunday, 7 May 2006 - 10:49
Measuring RMS, and transformer distortion
Its no easy task to do high quality measurements using transformers or opto-couplers. A few years ago in a similar situatioan I took the following approach: Use one...
Saturday, 6 May 2006 - 14:38
Harvard achitecture or Von Neuman architecture
When I used DSPs I liked Harvard, it gives me two (or more) busses to ride on in parallel. And constant data in AVR-flash is very convenient for me. The last time I used "self...
Friday, 5 May 2006 - 19:52
Sin wave generator
So, what are youre requirements: How much noise does the application tolerate ? How pure (with respect to harmonics) has the signal to be ? Can jitter be tolerated ? or the...
Friday, 5 May 2006 - 18:35
strtoa & atostr problem
What do you want to calculate ? Measured quantities often donthave more than 16 bits accuracy and limited dynamic range. Its often possible to avoid floating point arithmetic !...
Monday, 1 May 2006 - 20:28
I2C/TWI: Using a spare pin as a pull-up resistor?
See datasheet (electrical characteristics,dc,page 243 on top) Rpullup is between 20k and 50k for I/O pins If enough devices in parallel pull-up that might work.
Monday, 1 May 2006 - 09:49
measurement of low voltage
What supply voltage is available ? Can you use two ADC inputs for differential measurement ? If more than 4 volts are available you may create a mid-voltage reference (somewhere...
Thursday, 27 April 2006 - 20:39
measurement of low voltage
Perhaps you may use the opamp in a transimpedance-amplifier configuration, then you really can measure current without voltage drop accross the diode. I think thats the standard...
Thursday, 27 April 2006 - 17:10