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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....
Thu. May 17, 2018 - 08:54 PM
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...
Fri. Dec 15, 2017 - 12:31 AM
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...
Sat. Aug 19, 2017 - 10:32 PM
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:  ...
Thu. May 4, 2017 - 10:09 PM
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...
Wed. Apr 19, 2017 - 07:17 PM
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...
Sun. Jan 29, 2017 - 09:30 PM
ATMega328P datasheet bug: pin change ISRs aren't always called on wake
  In section 14.2, the datasheet says:   If an enabled interrupt occurs while the MCU is in a sleep mode, the   MCU wakes up. The MCU is then halted for four cycles...
Wed. Nov 9, 2016 - 08:05 AM
wake-from-sleep happens but ISR doesn't run how?
I think this program should only wake from sleep on pin change interrupt.   However, when pin changes are fast (bounce), it can happen that the program gets more 'wakes' in...
Fri. Nov 4, 2016 - 03:33 AM
when is loop_until_bit_is_set/clear required after setting a bit?
I remember reading somewhere in avr libc docs to do e.g. this:       PCIFR = _BV (some_bit)     loop_until_bit_is_clear (PCIFR, some_bit);   This may...
Wed. Sep 7, 2016 - 11:35 PM
what exactly needs to be reset after power-down ends?
  I can't find it now, but I recall reading somewhere that USART needed to be re-initialized.   Is there a general list somewhere of all subsystems that need attention...
Thu. Sep 1, 2016 - 10:26 PM
FET opto driver questions: opto current requirements and in-rush current control?
  This high-side P-channel FET circuit that seems to work to switch 9V from 5V micro:     The FET is a digital-drive type.   Questions:   Does opto U1 (...
Tue. Aug 11, 2015 - 06:56 PM
Do *all* step-down point-of-load exhibit output voltage drop under load?
  I've just tried my second 12V-5V step down module.  The datasheets for both are attached.   They both put out 5V as advertised at no-load, but with a 2 ohm (2.5A...
Sun. May 17, 2015 - 02:41 AM

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