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Discussion Title Created date
counting exact time measures
i want to count the exact period of time between a few clicks of a button. the first click will start the counter and the second one will stop it and the device should be able to...
Friday, 14 August 2009 - 15:13
Using digital pots. with higher voltage?
I'm using MCP41XXX type digital pots., these have the inputs rated at max Vdd+1, which is 6V is my case. I would like to use them in an application where the max voltage is higher...
Saturday, 1 August 2009 - 21:45
SPI with a digital pot
I'm tryig to interface with a Microchip MCP41100 digital pot (http://www.datasheetcatalog.org/datasheet/microchip/11195c.pdf). I wrote a simple code that should set the wiper to...
Thursday, 30 July 2009 - 16:23
A MUX is not what I thought it is?
I bought a SN74HC151N 8-to-1 multiplexer (someone told me to get 74HC logic). What I want to do is take reading from 8 10K pots on a single ADC channel input on an AVR. The...
Sunday, 26 July 2009 - 23:33
Interfacing with an external VCO?
I have an IC that has an internal VCO that is intended to be controlled by connecting a variable resistor to digital ground. The VCO controls analog processing the IC does. There...
Thursday, 23 July 2009 - 23:03
How to set clock speed?
I've searched the forum and looked at the ATMEGA168V data sheet and I'm not sure how the clock is set or even what is the default speed. If I'm not wrong the internal full swing...
Monday, 13 July 2009 - 00:54
Scaling up output using R/2R?
If using an R/2R network for DAC the output will still ve 0 - 5V. Is there a way to double the output scale from 0 to 10V using the voltage follower or this calles for another OA...
Saturday, 11 July 2009 - 15:08
Silly question but what is left and right adjustemt?
When using the ADC I can select the output to be either left or right adjusted. What does that mean?
Friday, 10 July 2009 - 13:42
Tips for ADC --> Delay --> DAC (@ 16bit)
I have a general intention to build a variable audio digital delay unit using external 16-bit ADC & DAC and use an AVR for setting the delay length. Can anyone suggest a few...
Thursday, 2 July 2009 - 23:37
CRC timer app does not work...
Hey, This is my first attempt to use the CRC timer function but the LED stays ON and won't go off. Any idea what could be wrong? Thanks! #define F_CPU 1000000UL // AVR clock @...
Tuesday, 30 June 2009 - 18:15
ISR problem...
In my code I use ISR(ADC_vect) I get the following compiler errors: error: static decleration of _vector21 follows non static decleration error: previous decleration of...
Friday, 26 June 2009 - 22:38
Question about sampling audio on ATMEGA168
I want to sample an audio signal and convert it to digital using the built-in 10-bit ADC. If the AVR runs at 20Mhz and the prescaler is set on 128 I get an effective clock speed...
Sunday, 21 June 2009 - 09:08

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