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How do I avoid a bus collision? A question for true experts.
Totally looks like the TX Enable of the master is staying active too long.   Is the master using a crappy USB to RS485 adapter that simply uses  an RC-Diode time...
Monday, 17 June 2019 - 19:23
HELP WITH LASER DIODE DRIVER
is this bread boarded.  Is there enough inductance in your leads to have ringing or oscillations  that exceeds the diodes rating?   I assume you have checked you CC...
Thursday, 13 June 2019 - 09:35
Advice on touchscreen LCD?
At scale - a generic 16x2 LCD is not cheaper than a TFT unless you have to include the cost of a larger battery to run the colour one.   A modern chip on glass led backlit...
Friday, 7 June 2019 - 20:44
ATTiny12 Making Lemonade out of Lemons
What timing - there was a HaD post today that is almost on this topic   https://hackaday.com/2019/06/02/...   Obviously i think that Tiny12 would be a perfect candidate...
Sunday, 2 June 2019 - 20:34
SD Card 5v to 3.3v level shifting for AVR
Just using 1K8 and 3K3 resistor to drop from 5V to 3v3 and then relying on the MISO pin to read the 3v3 swing output is not "in spec".  However I can say that thousands of...
Tuesday, 16 April 2019 - 21:46
SD Card Failure in Nissan Navigation System
SD stands for Secure Digital.   It has several built in copy protection mechanisim.s   If you can see directory structures on your PC and try copy files and it fails -...
Friday, 5 April 2019 - 19:32
PIC programming
John_A_Brown wrote: Just googled it. I think LPT was the standard method.  Not sure I can be bothered this time around. Even though I do have a proper LPT port on a desktop...
Sunday, 24 March 2019 - 12:03
What value is the PIN toggle?
can you not make a 2/4/6/8/10/12/14/16/18 clock pulse from a USART with a single out instruction?
Tuesday, 12 March 2019 - 22:20
What value is the PIN toggle?
ka7ehk wrote: test the appropriate bit from that port (often involves a mask), then make a decision based on that masked port value   What about a XOR boy? You don't have to...
Tuesday, 12 March 2019 - 06:41
Mimic SAA1043 to generate PAL CCIR sync
For completeness.  Here is a PCB that takes an AC coupled composite signal.  It uses an edge detector on the analog comparator pin.  Software then searches for "...
Sunday, 10 March 2019 - 12:39
Mimic SAA1043 to generate PAL CCIR sync
/me sings - Anything a PIC can do an AVR can do better, An AVR can do anything better than PIC   As Brian said there is no way to make a VCO with software inside an AVR....
Sunday, 10 March 2019 - 12:07
USART in MSPI mode as a fast shift register
Instead of doing a sleep() you can also spend a few cycles at the start of the ISR to correct for the jitter.
Tuesday, 19 February 2019 - 20:01

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