Post Created date
Why use an external pull up on reset pin ?
If I won't be using debugwire I don't see any reason connecting something that is already internally connected. I don't need external reset of any kind.
Monday, 26 December 2011 - 22:19
How to generate a 38KHz 10% or 25% d.c with minimum cpu load
First of all, I did look through the datasheet. I find the timers section of it rather confusing and hard to understand. At first I thought it can be done with a 16bit timer and...
Thursday, 22 December 2011 - 01:25
How to generate a 38KHz 10% or 25% d.c with minimum cpu load
Your comments aren't very helpful. I can't find a way to set pwm @ 38KHz with pure hardware on an 8MHz avr. If you'd be so kind and enlighten me.
Wednesday, 21 December 2011 - 23:35
How to generate a 38KHz 10% or 25% d.c with minimum cpu load
Ok scratch that about toggling at 76KHz, the /2 in the formula already takes care of that so to get 38KHz I could preload OCRn with 104. But it's still 50% duty cycle. So what...
Wednesday, 21 December 2011 - 22:34
Which checksumming method should I use ?
I just realized that avr-libc has built in crc library. I tested out some crc16 calculations with it and it seems VERY fast. Thanks guys.
Tuesday, 20 December 2011 - 19:50
Medium distance proximity sensor.
First of all thanks for all the help Jim. Secondly, I know that RPM isn't a speed, but since it going to detect ONE circular moving object which spins rather slowly -10 Hz at...
Monday, 19 December 2011 - 07:54
Medium distance proximity sensor.
It has to be board mounted. The power source is 3xAA batteries so they can handle the current. The speed of the object would be pretty around 1500 rpm max I imagine. Is there any...
Sunday, 18 December 2011 - 23:50
Medium distance proximity sensor.
I will only need to detect the presence of an object. And the budget for this capability is under 4$, the cheaper the better of course. An ATmega8A is also available. And I've got...
Sunday, 18 December 2011 - 23:35
Current loops in a constant current driver ic ?
Thanks a lot.
Saturday, 17 December 2011 - 10:28
Sound card output signal biasing ?
The simple sine will be ask modulated. I recently decided to drop this method of biasing. I'd use an op amp to amplify and cut off the negative sine and just feed it to the...
Wednesday, 14 December 2011 - 18:28
Sound card output signal biasing ?
Yep, you're right. It reads 230V here. I'll be using the atmega8 internal comparator. No complicated sound-waves involved just simple sine probably. I would like to be able to...
Thursday, 8 December 2011 - 20:34
Sound card output signal biasing ?
My DVM is a cheapy so I kind of doubt it does AC RMS, I think it's peak measurement. I'll be feeding the sound output to a comparator which will be running from 3 AA batteries so...
Thursday, 8 December 2011 - 16:55