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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
[SOLVED] Question: AVR, interrupts and ISR
Hi all,   I searched here and found quite a few posts about ISRs and interrupts, but none answered my question. Please consider this example code:   volatile uint8_t x...
Sunday, 29 March 2020 - 20:33
SO8N package - pin 1?
Hi all,   I've got some 8 pin SOIC package chips in a tape. Pin 1 is not marked in any way on the chip!  There is no notch on the pin 1 end, no dot molded into the part...
Tuesday, 10 March 2020 - 23:23
Wetted switch contacts
Hi all,   I tried an experiment today which was completely successful and the info may be of use to some.   I have a small quantity of GALINSTAN which is an eutectic...
Monday, 9 March 2020 - 05:25
Calling a function by address
Hi all, I would like to know if it is possible to call a function by address as well as pass data to it and return data from it? For example, if I write a function that takes two...
Saturday, 7 March 2020 - 06:00
AVR xml files
Hi all,   I use Linux and therefore cannot use or install AVR Studio. I don't even want to, but I do want to get a copy of all the AVR xml files that have individual chip...
Thursday, 5 March 2020 - 10:36

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