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4x4 matrix keypad
I have read other posts about 4x4 keypad but I like to try things from scratch sometimes to learn. Does this make sense to anybody else? What my intention is to have each key be a...
Sunday, 25 September 2011 - 04:43
fast pwm rearrange formula
Ok my math skills need work. My current occupation doesn't involve a whole lot of algebra. But am I right in rearranging this formula for the pwm top value? Fpwm = Fclk / N * (1...
Wednesday, 28 April 2010 - 21:26
How to connect mutiple grounds
I have a teens++ board powered by +5v usb. I need more power then the usb port can supply. I am going to add a regulator and another power source. What is the best way to connect...
Saturday, 31 October 2009 - 15:11
Xcode code sense include files
Sorry if I am posting this in the wrong section. I just could find the right place. I wan to try using mac's Xcode. I have found project templates to create an avr project with...
Monday, 19 October 2009 - 15:06
Help with timer expired funciton
I have the following code that allows me to have timers and test if they are expired. #include #include #include #include #include "timer.h" volatile uint16_t ms_tick;...
Tuesday, 21 July 2009 - 17:30
PWM DAC for audio confusion
Ok, I have read the tutorials and am confused. I want to generate two alternating tones 1200Hz and 2200Hz for an fsk modulator. To do this do I use timer1 in pwm mode(phase and...
Monday, 4 May 2009 - 16:05
pointers faster then arrays?
I'm just curious, I have a funtion that returns the element of a struct from and array of structs.. Hope that made sense. Any way I found that doing void test(uint8_t...
Wednesday, 9 July 2008 - 22:46
How to determine how many ADC significant bits
I have been trying to find out how I determine how many significant bits the ADC has for an ADC clock frequency. I know that at 50K-200Khz the atmega168 has 10bits resolution. How...
Tuesday, 12 February 2008 - 15:58
AVCC Decoupling
the atmega168 recommends that you decouple the AVCC using a 100nF cap and a 10uH inductor. I have some 15uH inductors and want to know if i shold be able to get away with the...
Tuesday, 22 January 2008 - 16:11
ADC with vref less than 0.1 Volts
I am making a stepper motor controller for fun and learning. I want to have current control. To do so I have put a shunt on the low side of the mosfets driving the coils. I want...
Monday, 21 January 2008 - 21:01
Switching adc channel in free running mode
I want to set up my adc in free running mode. I want to cycle through channels and store them in an array. When the adc interrupt occurs I have it store the current value in the...
Monday, 21 January 2008 - 19:58
atmega32 watchdog not reseting
I have a problem where the watch dog is not reseting even though wdr is being called more than enough times. I am using an atmega32 running at 14.7456Mhz. I have a loop that calls...
Tuesday, 4 September 2007 - 15:17