Post Created date
Photo resistor output optocoupler
jgmdesign Thank you for the link. RickB I'm reasonably confident I can correct predictable non-linearity in software. What I really need is to be able to pull the wiper line to...
Thursday, 25 August 2011 - 17:24
Photo resistor output optocoupler
Chuck-Rowst Thank you. I will look into the digital pot again and see if i can find a suitable part. I had not thought of using an opto to isolate the supply voltages. I agree,...
Wednesday, 24 August 2011 - 15:39
Photo resistor output optocoupler
RickB Thanks for pointing out the Vactrol optocouplers; very interesting. daqq Thanks. I have looked at a few digi pots and the datasheets say that the voltage on the pot wires...
Wednesday, 24 August 2011 - 14:07
Photo resistor output optocoupler
daqq Ouch. I had not thought of that. I noticed that CdS cells were getting scarce, but it did not occur to me that RoHS got them. Chuck-Rowst I am trying to replace a...
Tuesday, 23 August 2011 - 19:03
Moving past the Arduino
OP, I am all for moving away from the Arduino, but I cannot help with that. However, comparing two voltages, and changing an output depending on which one is greater is a task...
Monday, 22 August 2011 - 09:11
Help flashing firmware on to a sparkfun grapic serial lcd
I don't have enough knowledge in this area to make much sense of the details you have posted. Perhaps you could try some simpler code, maybe something with included Makefiles, and...
Saturday, 20 August 2011 - 21:25
Help flashing firmware on to a sparkfun grapic serial lcd
How are you connecting the avrisp mk2 to the sparkfun board? Oh, better question, I think that figuring out why avr studio says connection failed is the first thing to do. Are you...
Thursday, 11 August 2011 - 05:39
stepper motor
Good info here.
Thursday, 4 August 2011 - 07:38
ADC range
It just occurred to me, you could possibly set the mcu to use the internal 1.1 volt reference, and then use the zener to drop the 3 volts and then you could directly measure the 1...
Monday, 11 July 2011 - 13:46
ADC range
So, you want to use all 8 or 10 bits of ADC resolution over the 1 volt from 3 to 4 volts? I don't think it is possible to do that with just the mcu. I think that would require...
Monday, 11 July 2011 - 13:34
Reading Digital Output Sensors Using AVR MCUs
Well, they say it is supposed to be used with a digital input, so I think it is just a matter of connecting the output of the sensor to a digital input pin, and reading the value...
Monday, 11 July 2011 - 05:22
Trouble with voltage/current regulator [SOLVED]
I gave it one more try using some ideas I had, and made it work. Let me tell you; it's a beautiful thing :) The three changes are; 1) The outputs of the 393 are only open...
Friday, 24 December 2010 - 04:39