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atmega324PA not working at higher than 1MHZ freq
So the blinky LED thingy works fine at all frequencies.  The chip is happy.   But it won't be, if you don't have caps on your 7805 outputs.  10uF would be a...
Monday, 6 April 2020 - 02:41
atmega324PA not working at higher than 1MHZ freq
It's the voltage regulator that bothers me.  We're going to need a lot more information about how that's working, and what it has as output.  Is it a switching regulator...
Sunday, 5 April 2020 - 21:18
atmega324PA not working at higher than 1MHZ freq
It certainly doesn't need any more voltage, but it might want more current.  What's your supply rated at, in amperes?   It might also want a better pullup on the /RESET...
Sunday, 5 April 2020 - 20:22
Fast dividing by 5 and by 10 for uint32_t input data for ATMEGA16A
westfw wrote: I'd guess you could compute X/5, where X is an 8-bit value, We want 32bits, not 8bits.  That makes a lookup table impractical.   Yes and no. ...
Sunday, 5 April 2020 - 20:09
Programming One AVR with Another
The EEprom idea, and the SD card idea, both have the interesting advantage that neither contains the whole program - if you're worried about someone swiping it.  Even if they...
Sunday, 5 April 2020 - 16:04
Programming One AVR with Another
joeymorin wrote: Scroungre wrote:Seems to me that fifty cents worth of TTL glue logic could solve the bit-banging MISO/MOSI swap. Zero cents worth of software will do the same...
Sunday, 5 April 2020 - 15:49
Programming One AVR with Another
Another suggestion, although it might be a bit late now - Skip the whole AVR programmer, and put the smarts into the 'field' device.  Have it, on powerup, go looking for an...
Sunday, 5 April 2020 - 15:37
Programming One AVR with Another
If you have an AVRisp I'd be tempted to take it apart and look at it.  I believe it's basically an AVR that programs AVRs, with an internal bootloader and a USB connection....
Sunday, 5 April 2020 - 15:13
Pin header/socket placement for board to board connectors--how close to card edge to place?
davethomaspilot wrote: There's no need for mechanical strength connector to connector.  They should never touch.  Touching means sheer force is being applied.   Pcb...
Saturday, 4 April 2020 - 15:29
Pin header/socket placement for board to board connectors--how close to card edge to place?
Here's my thoughts:     By "Flush" I mean those two plastic faces should be designed to be in contact.  They're much more mechanically strong that way.   By '...
Saturday, 4 April 2020 - 14:06
Pin header/socket placement for board to board connectors--how close to card edge to place?
Step 1:  Stop mixing "English" and metric units.   Step 2:  You need at least half the connector overhanging the board end, or they won't plug in.  You're...
Friday, 3 April 2020 - 23:04
TWI ACK issue
david.prentice wrote: p.s.   I often run student's TWI code but only if they are not employed by the Devil.  I do not attempt to even read code when a student has...
Friday, 3 April 2020 - 14:57

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