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I/O operating voltages between two ATMEGAs
Hi,   I have a system that includes two ATMEGAs, one is run at 3.3V because it interfaces with the SD card.  The other is run at 5V at max clock of 20Mhz. The 5V one has...
Wednesday, 12 June 2019 - 21:58
Looking for the below specific jump wires
Hi all,   I've been searching high and low for the below jump wires that I saw on Digikey, but Digikey charges an arm and a leg for them.  I would like to know what the...
Thursday, 6 June 2019 - 20:52
Attiny lock bits to prevent firmware from being read
Hi,   I am using the ATTINY2313, and I read in the datasheet that I can program the lock bits to prevent my firmware from being read, thus protecting my firmware.  ...
Sunday, 21 October 2018 - 15:01
Low voltage on old CPU, the MC68000 and MC68008 CPUs
Hi,   I am experimenting with the old CPUs.  Got some from eBay.  They are the MC68000 and the MC68008, both operating at 5V.   I basically wire them up on a...
Saturday, 12 May 2018 - 04:42
Why there is no TWI7 defined in samg5_xplained_pro.h for ASF for the SAMG55?
Hi,   I looked at the file samg55_xplained_pro.h and see the below #defines for all the TWI pins.  The SAMG55 has a TWI7 for peripheral B for pins PA27 and PA28.  ...
Wednesday, 31 August 2016 - 16:35
How to turn on SAMG55J19's TWI7 peripheral B pin27A/pin28A
Hi all,   Appreciate pointing to the write direction how to set up the SAMG55J19 to use its TWI7 (I2C) from PIN27A/PIN28A.  According to the datasheet, I would have use...
Sunday, 24 July 2016 - 05:10
radial electrolytic caps replace polystyrene caps?
Hi,   I am looking to replace the Vectrex game console motherboard's polystyrene caps, which are quite expensive.  I am wondering if normal radial electrolytic caps like...
Saturday, 21 May 2016 - 19:58
Mysterious voltage drop?
Hi,   I am trying to interface with the TMS9918ANL (TI's Video Display Processor, 30 years old!).  Min voltage requires for this chip is 4.75V.   I use the ATMEGA...
Tuesday, 29 March 2016 - 17:29
Can write fuses but CAN'T read back with usbtiny for ATMEGA328
Hi,   It's one of those fuse days again.  As you can see below, I can write the fuses for my ATMEGA328 (just the original ATMEGA328 not ATMEGA328P) using USBTiny...
Tuesday, 25 August 2015 - 00:32
Replacing electrolytic caps for the power supply board of a 30-year-old computer
Hi,   Besides playing with AVR microcontrollers, I collect vintage computers.  I have acquired an Atari 1040STF, and I believe the caps on the power board need to be...
Sunday, 5 July 2015 - 17:12
Generating a clock frequency
Hi,   I follow the attached schematic to generate a 3.579545Mhz frequency, using the crystal 3.579545Mhz.  In the schematic, I choose C1 as 22pF.  The frequency...
Saturday, 17 January 2015 - 22:54
Analog GND and digital GND clarification needed
Hi,   Doing a project with SPI and MP3 player using the VS1003B MP3 decoder chip.  I've found a lot of projects on the net that I can try out.  One such project is...
Friday, 2 January 2015 - 19:51

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