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what happens on Arduino power-on, and how long does it all take?
  Here's how I think it all works and times where I know them.  It's actually mostly not Arduino-specific.  My hope is to eventually get this exact and with good...
Sunday, 1 November 2020 - 20:46
how long does pre-main()C initialization code take?
If you have an atmega328P programmed with an ISP (i.e. no bootloader) how long does it take from the time the chip releases it's internal reset to the beginning of execution of...
Friday, 30 October 2020 - 20:45
how to write EEPROM with extreme safety?
I want to be robust to power drops at least.  I'm interested in robustness to interrupts as well (see below).   what I have now is a system with three bytes per byte of...
Friday, 3 July 2020 - 22:46
clever way to tell if a particular pad of SMT part is connected?
I have one of those SMT parts with many pads entirely hidden under the part (image attached).   I suspect one particular pad may have failed to connect during reflow. ...
Wednesday, 22 April 2020 - 04:13
do really short traces need impedance control?
  I have an antenna line for a cell modem.  The modem manufacturer specifies a particular PCB layer stack up, seemingly with the implication that following that stack-up...
Monday, 30 December 2019 - 20:46
get ISP clock frequency setting of an AVR ISP mkII
  Apparently the AVRISPmkII has some persistent state, including ISP frequency.  Is there a linux tool that lets you query this stuff off the device?  ...
Tuesday, 5 November 2019 - 00:58
FCC rules for 433 MHz question about 15.231 Paragraph E
  I'm looking to licence a device with FCC under section 15.231 Paragraph E, as described roughly in the attached pdf.   My device consists of two parts that talk....
Thursday, 17 May 2018 - 20:54
recomendataions for cell/cloud gateway that actually WORKS?
I'd like something like hologram.io dash, but I can't get their stuff to work two days in a row their firmware is a weird mess and they show signs of intending to stuff Arduino...
Friday, 15 December 2017 - 00:31
protect input that might be driven when AVR is off? with FET?
I have an AVR input that the other side might attempt to drive when the AVR with that input is off.  I'd like to somehow cut off that input when the AVR is off.   I...
Saturday, 19 August 2017 - 22:32
how to safely transmit MCUSR contents from bootloader to main program?
  The AVR libc docs show how to safely get MCUSR copied into a variable and reset early (as required to prevent possible infinite resets) in the top of this page:  ...
Thursday, 4 May 2017 - 22:09
making sense of ATMega328P bootloader addresses
  In Table 30-7 of the ATMega328P datasheet, it says that with BOOTSZ1 and BOOTSZ0 both programmed to 0, the start of the bootloader secion is 0x3800. I tried using this...
Wednesday, 19 April 2017 - 19:17
how does this free-wheeling protection circuitry work?
I'm looking at the datasheet for a high-side switch (TI TPS2H160B) I understand the Diode D to protect against revers voltage, but I don't understand what the TVS is doing in this...
Sunday, 29 January 2017 - 21:30

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