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Fine tuning a crystal in code
I’m thinking of making a clock (which would always be subject only to room temperature) using a 32.768 kHz xtal driving a counter. The xtal has 20 ppm frequency tolerance which I...
Tuesday, 21 May 2019 - 05:52
Seeking easiest way to add Bluetooth to an embedded design
I'd like to dip my toe into the Bluetooth pool by making a clock that is settable via BLE.  I know it's overkill, but I'd like to keep the application as simple as possible...
Tuesday, 14 May 2019 - 03:02
Is it OK to splice thermocouple wire?
I have a metal part whose temperature I want to monitor with a K type thermocouple.  This part screws into the machine it's a part of for periodic removal and reattachment....
Friday, 26 April 2019 - 02:38
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...
Monday, 11 February 2019 - 21:24
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....
Wednesday, 23 January 2019 - 22:02
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...
Thursday, 13 December 2018 - 14:37
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...
Wednesday, 12 December 2018 - 05:38
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)....
Wednesday, 14 November 2018 - 14:56
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...
Monday, 27 August 2018 - 02:11
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...
Friday, 20 July 2018 - 18:35
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?...
Monday, 25 June 2018 - 04:54
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...
Tuesday, 5 June 2018 - 21:33

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