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matrix keyboard 8x8
I think you'll have some difficulties with multiple simultaneous key presses. int array_exist(char klawisz) { for (k=0;k
Friday, 31 May 2013 - 01:53
Problem with pointer
itoa(count, value, 10); 'value' is declared to be a char, but itoa takes a pointer to char. That's the first problem I see. DrawString(str); Where is 'str' defined...
Thursday, 23 May 2013 - 22:27
2 potentiometers adjust Frequency and Duty Cycle
TIMSK0 |= (0 << TOIE0 ); // Disable overflow interrupt This doesn't do what you think it does. Re-read Johan's post about clearing bits: JohanEkdahl wrote:1) Doing 0...
Wednesday, 22 May 2013 - 19:31
Unable to read from uC from C programm under Linux
When read() returns -1, what is the value of errno? My guess is that it is EAGAIN or EWOULDBLOCK, because you set the tty to non-blocking mode, and data is not yet available for...
Saturday, 18 May 2013 - 17:50
Rocket staging timer
Ok, I have the MOSFET and continuity sense all figured out now. Thanks guys. Now I have a question about driving the piezo. In the PerfectFlite minitimer3, the piezo speaker is...
Wednesday, 2 February 2011 - 18:12
Rocket staging timer
Kartman wrote:Quote:Instead of a voltage divider, I was thinking about using an NPN transistor (emitter->ground, collector->pin, base->drain). This should drive the pin low when...
Wednesday, 2 February 2011 - 07:15
Rocket staging timer
mckeemj wrote:christop wrote:I'm making this unit completely self-contained, with no external parts. There does not need to be any external parts as such to implement an "arm"...
Wednesday, 2 February 2011 - 07:06
Rocket staging timer
mckeemj wrote:As for a continuity detect system if you move the MOSFET, simply add a pulldown across the MOSFET and sample at that point. If there is continuity, you will read...
Wednesday, 2 February 2011 - 06:48
Rocket staging timer
Thanks for the quick replies everyone. DocJC wrote:Many voltage regulators need several volts above their output voltage as their input voltage. A 6 V battery will not supply...
Tuesday, 1 February 2011 - 20:03