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How to cool a small amount of air?
I have a project that requires me to cool about a cubic foot of air from room temp down to around 40 degrees F.  There are several products on the market that might be able...
Mon. Feb 11, 2019 - 09:24 PM
Seeking battery performance data in ultra low-power (uW) applications
I'm considering a design that would be activated by a capacitive touch switch.  The switch circuitry would be the only thing drawing power most of the time at 34uA and 3V....
Wed. Jan 23, 2019 - 10:02 PM
Simulating uint64_t
I have an ATMega128A application where I need to shift a field of 12 1s through a 40-bit long number, one bit at a time. It seems to me the easiest way to do this would be to use...
Thu. Dec 13, 2018 - 02:37 PM
Bench supply vs. chassis supply problem
I'm building a system based on an ATMega128A.  My board (which only draws about 25 mA) works fine when running off my bench supply's 5V.  When I switch to the chassis...
Wed. Dec 12, 2018 - 05:38 AM
Selecting a zener diode for solenoid flyback suppression
I'm low-side driving a 24V, 1.2A DC solenoid with a 30V MOSFET. I'd like to protect the MOSFET with a zener diode across the source and drain (cathode to drain, anode to source)....
Wed. Nov 14, 2018 - 02:56 PM
How to use memory mapped IO in ATMega32A
The datasheet for the ATMega32A shows the IO ports as being memory mapped.  E.g., the address for PORTA is given as 0x1B (0x3B).   1.  What's the difference between...
Mon. Aug 27, 2018 - 02:11 AM
External storage: USB or SD card?
I need to design a board that will have to access external, removable storage of less than 5MB.  The CPU needs to be an AVR with a USART and a handful of GPIO.  The most...
Fri. Jul 20, 2018 - 06:35 PM
Ateml-ICE fails to enter programming mode in AS7
I'm trying to program an ATTiny85 via Atmel-ICE and debugWire from AS7, but I get an error:   My devices seem to be set up correctly: What might be causing this?...
Mon. Jun 25, 2018 - 04:54 AM
OK to use a filter cap on RESET when using JTAG?
I'm designing an ATMega32A board, which is programmed and debugged via the JTAG interface.  The AVR042 app note recommends a .1 uF cap on reset unless you're using DebugWire...
Tue. Jun 5, 2018 - 09:33 PM
Reflowing a previously soldered board
In a week or two I'm going to bring up a new board I've designed based on an ATMega32A.  It has a 5V regulator fed from an external 12V supply, 16 MOSFETS, an RS485 driver,...
Tue. May 15, 2018 - 03:36 PM
ATMega32A: JTAG vs. debugWire
I'm starting a new design with the ATMega32A.  The chip supports both debugWire and JTAG, and I'm wondering what the benefits and disadvantages of each are.  I'll be...
Sun. May 6, 2018 - 05:59 PM
Have you ever driven a 16x2 I2C LCD?
I bought one of these inexpensive 16x2 I2C LCDs on Amazon.  There's no documentation, but I figured how hard could it be to get up and running, since I've used UART-...
Thu. Mar 8, 2018 - 04:59 AM

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