Post Created date
Cheap Current Trip Circuit Needed.
It's looking like the easiest way to do this is to use something like an ACS712 Cool chip.   But you still need a pass transistor to enable you to turn off the current when...
Mon. Feb 18, 2019 - 06:06 PM
What to do with Arduino project and a non-arduino board (ICSP isn't helping...?)
Nice looking PCB/Keyboard. Gotta love those WS2812B digital LEDs.   The PCB clearly has the micro's Xtal and its two caps, and an RC for the reset pins, sitting between the...
Mon. Feb 18, 2019 - 05:30 PM
TWI not work after pull-up resistor inserted
I am glad you have it working.   But just to harp on two comments made above:   I'd suggest you put the Xtal in the two rows of sockets that the micro's Xtal pins are...
Mon. Feb 18, 2019 - 05:08 PM
Waterproof is a binary concept...
The issue is the back side of the house has a couple small roof segments a different angles / directions. It undergoes some freeze / thaw cycles, and ice can build up / work under...
Sun. Feb 17, 2019 - 12:44 PM
Waterproof is a binary concept...
Thank you for the pointer to the case.   I'd have to re-spin the board, but that would be OK as I've learned a lot about water proofing since that first project.   Truth...
Sat. Feb 16, 2019 - 05:59 AM
TL431 and optocoupler
OK, I'll relax on the dyslexic labeling and circuit flow...   It would work well for a smps because as the output went from 0 to + 12 V, for example, it would provide a...
Fri. Feb 15, 2019 - 04:51 PM
Convert an NPN output to UART?
Is there any reason I couldn't take an old serial or PS2 mouse (whichever one puts out UART, or do both?) and gut it, put one set of the optical emitter and sensor on...
Fri. Feb 15, 2019 - 04:34 PM
TL431 and optocoupler
Linear feedback???   Perhaps I need more caffeine, or more sleep, but my first thought was that this isn't designed for linear feedback. It is designed for an On/Off output...
Fri. Feb 15, 2019 - 04:00 PM
Atmega32 VCC and GND pins shorted
Throw the chip out.   Sorry.   Reversing the power supply on the micro is a fatal error.   JC
Thu. Feb 14, 2019 - 08:40 PM
XMEGA128A3U errata and ADC problem
The Xmega128 was the first Xmega, and it did have lots of errors. As the product line has grown the errata list has shrunk a lot.   Sound to me like its time to take a set...
Wed. Feb 13, 2019 - 09:07 PM
Convert an NPN output to UART?
Welcome to the Forum.   I'm confused by your description.   A rotary encoder outputs two logic level signals. A UART typically takes a data byte and ships it outs as a...
Wed. Feb 13, 2019 - 08:51 PM
USB plug-to-plug
So, what language is the PC user interface program written in?   I have a couple different projects that have a PC interface to a FTDI chip, then to a micro.   I still...
Wed. Feb 13, 2019 - 08:27 PM

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