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suppress surge at the source on 120 vac house circuit ?
Hi All,   I have a printer that causes house lights to flicker whenever we submit a print job.  I believe this is a transient from the printer waking up and starting...
Monday, 30 September 2019 - 16:39
AVR generated 12v pulse, just for fun
Hi All,   I have not done any circuit design in 40 years, and that was freshman circuits (from Smith) and a senior MCU project (w/ 6800), but I have done a lot of embedded s/...
Saturday, 28 September 2019 - 15:29
blink LED on 4809
I have a 4809 based curiosity nano.   I want to blink the user LED.   The hardware data sheet says. So the LED has an external pull-up.  In order to...
Friday, 13 September 2019 - 02:16
4809 / 0-series TCA CMPnEN pin-select documentation does not make sense
Hi All,   I'm hacking on my Curiosity Nano with atmega4809.   I'm trying to set up TCA0 to toggle pin 5 on port F (the user LED). The 0-series datasheet indicates I...
Sunday, 8 September 2019 - 19:31
curiosity nano default clock rate?
Hi All,   I am working with a curiosity nano (with atmega4809).  LED blinking w/ delays seems to indicate that the clock rate is not 16 MHz or 20 MHz. The nano...
Sunday, 8 September 2019 - 17:09
gcc8 error: pseudo instruction `__gcc_isr' not supported
I put together gcc8.3.0 and associated tools (including avr-libc from SVN)  with the 1.3.300 AVR dev pack.  I'm trying to compile a program with interrupts and I get...
Saturday, 7 September 2019 - 15:52
UNO 3 --I2C-- DFRobot IMU not getting past START
I have chinese UNO 3 w/ mega328p connected to SEN0142 from DFRobot with a MPC6050 IMU (3 DOF gyro + 3 DOF accel). UNO 3 <-->  IMU +5V    <---> Vin GNC...
Friday, 24 May 2019 - 16:47
building gcc=8.3, avr-libc on Linux w/ atpack hooks
Below are my notes on building binutils, gcc and avr-libc with hooks for atpacks.  Why?  I can compile for atmega4809 now. In the following I'm installing under /opt/...
Tuesday, 21 May 2019 - 00:52
gcc, libc for atmega4809 ?
I'm on linux, and prefer to use classic unix tools to cross compile for AVR. My linux distro comes with avr-gcc 5.4.0, avr-libc-2.0.0, etc.   Has anyone found a way to cross-...
Wednesday, 15 May 2019 - 13:10
scope issue
Hi All,   Have not done electronics in decades.    Bought a cheap scope: Hantek DSO5072P, which came with two probes. I was working with it today to debug UNO...
Friday, 10 May 2019 - 17:56
how to verify CPU is going to sleep?
I have a demo to use a timer interrupt to wake up the CPU and toggle a pin to blink the LED on my Arduino Uno 3. Is there a way to verify the processor is sleeping?  ...
Sunday, 5 May 2019 - 22:39
avr-as and word addresses
Hi,   I'm working with avr-as and trying to load the word address of a function into a register pair.  I am getting the byte address.  Does anyone know the syntax...
Sunday, 14 April 2019 - 22:52

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