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Low voltage on logic high
Hello, I've got an interesting issue with logic high. Ive got an ATmega644, 44pin package. Ive got a chunk of simple code (among a lot of other code): #define oc0STRT 0 #...
Tuesday, 12 February 2013 - 05:26
Specific electrical question [SOLVED]
Sorry for the double posts, the other topic was getting too conversationally crowded and off the main subject. I'll try to ask a direct question about a piece of circuitry that...
Thursday, 11 October 2012 - 03:28
General electrical question
Hello, This is very vague, I know, but if you have questions that could perhaps lead this question to an answer, please ask! I built a car starter that takes commands over SMS....
Wednesday, 3 October 2012 - 22:14
Problems with C? Problems with strstr()!!??
I'm at a loss. This is killing me. Should be simple, but the output doesn't make sense: char* vf = strstr(gsmBuffer, "+CMGR: \"REC UNREAD\","); uartSendString("\r\n...
Tuesday, 29 May 2012 - 02:33
Wake on uart rx
Hi. I want to wake up on uart receive. I tied rx to INT0, which works fine in the sense of only waking up. However, my received characters after wake up are crazy random...
Tuesday, 22 May 2012 - 16:47
Is my uart module busted?
I can transmit fine. If I probe the Rx pin, which is being pulled up by a 1k resistor to 5v, I get a voltage around 1v. The tx pin is sending "c" to my serial on my computer over...
Monday, 14 May 2012 - 23:22
Simple Digital IO. This should be simple.
Please tell me something here is wrong: MCUCR = 0b00000000; DDRA = 0b00000000; PORTA = 0b11111111; ... while(1) uartPrintNum((int) PINA,'b'); uartPrintNum converts a number...
Wednesday, 22 February 2012 - 03:18
Is it safe to call main() from anywhere?
I'm receiving UART in an interrupt vector. If a special string comes in, I want to stop everything I'm doing in my main program, and start it from the start, while not losing any...
Wednesday, 30 March 2011 - 04:21
submersible 20kHz+ speakers (underwater comm)
I'm wondering if anyone has a source for submersible speakers that are in the 20kHz+ range. Also useful would be mics that could hear them! I'm thinking about underwater...
Wednesday, 8 December 2010 - 03:14
Whats wrong with my preprocessor statements?
Simple: #define QUAD_SPEED_SAMPLE_TIME 0.2 #define TIMER0_PRESCALER 64 #define QUAD_SAMPLE_TIME_COUNT (int) (F_CPU*QUAD_SPEED_SAMPLE_TIME/256/TIMER0_PRESCALER) ... #if...
Thursday, 3 June 2010 - 16:21
Error in code in AVR App note on PID
App note 221. Last line on page 7. They use the process value for the derivative term. Sure, why not. But they show (everywhere shows in fact) that the derivative is calculated...
Tuesday, 6 April 2010 - 14:35
ADC acting up
So I have a small ADC library thats worked until now. Maybe someone can spot the problem? uart output is either always 0 or always 1023. AVR studio latest version ATmega644...
Wednesday, 31 March 2010 - 03:08

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