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Have a problem with parsing options using "getopt_long"
Hi all, I am working on a program that will take command line options and work with a file. The program usage is like this: program -a -b --linelength=12 filename Note that the "...
Tuesday, 29 June 2021 - 01:20
Question - Find inductance of unknown coil
Hi all, I feel really stupid for asking this, but something is whispering in my ear that I'm wrong, so I would appreciate a second (third, fourth, etc...) opinion. I'll make a...
Thursday, 13 May 2021 - 11:03
LC circuit - how to choose L and C?
Hi all,   I know the formula F = 1 / (2 pi sqrt (LC))... that's not what I'm asking. "Theoretically" any L and C can plug into the equation and work numerically, but how to...
Monday, 26 April 2021 - 00:40
Question for GNU Readline expert (or at least smarter than me!)
Hi all,   I have an ANSI Basic compiler that I compile from source. The original source was written by Michael Haardt (LINK). One huge shortcoming was that it had a...
Saturday, 9 January 2021 - 03:16
Makefile question - how to do this?
Hi all,   I have what should be a simple question, but I just can't seem to fine the answer. In a Makefile, I have the following line:   libdir=/usr/lib/x86_64-linux-gnu...
Tuesday, 29 December 2020 - 09:14
Crystals doing strange things - ideas?
Hi all,   Brief explanation: I built a small project using an ATTINY85 and a 22.1184 MHz. crystal. I edit the source using the NANO editor and compile/upload the code using a...
Sunday, 20 September 2020 - 08:58
AVR Interrupt Question.
Hi all,   I'm working on a project, part of which requires getting the RPM of a PC fan with a tach output. The fan has an open drain output which goes low twice per...
Saturday, 8 August 2020 - 06:20
Requesting advice: MOSFET or IGBT in place of BJT?
Hi all,   I would like some quick advice. First of all, please no "why do you want to do that" or "use a switcher" or any other things that are not what I asked.   With...
Thursday, 23 July 2020 - 11:55
Power BJT strange functioning - am I doing something wrong?
Hi all,   I obtained two NPN BJT power transistors from DigiKey. They are by ST Micro and the part number is BUT30V. These are 100 amp, 250 watt parts in the "ISOTOP" (SOT-...
Thursday, 23 July 2020 - 00:02
Is it possible to tell between data in PROGMEM or SRAM at runtime?
Hi all,   If I do this: static const uint8_t bitmap[] __attribute__((progmem)) = { 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00, };  or this: static const...
Wednesday, 6 May 2020 - 20:07
ATMega8u2 strange problem
Hi all.   I have a clone Arduino MEGA board which uses an ATmega8u2 as the USB to serial link. It works fine.   What I did was to change the low fuse of the 8u2 from...
Monday, 4 May 2020 - 04:20
Question about PROGMEM and __flash: can I eliminate a step?
Hi all,   I have lots of bitmap files (character font data for a graphics VFD display) in PROGMEM as such: #ifndef IBM_8X16_H #define IBM_8X16_H #define ibm_8x16 (...
Saturday, 25 April 2020 - 13:26

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