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Odd array index behavior
I'm having this problem in Arduino, but I don't get much help over on the arduino.cc forum, so I thought I'd try over here.  After all, there IS an AVR in there () and I...
Tuesday, 24 September 2019 - 22:07
Problem passing an array struct element to a function
I'm having this problem in Arduino, but I posted on the arduino.cc forum and didn't get a reply, so I thought I'd try over here.  After all, there IS an AVR in there ( ) and...
Sunday, 22 September 2019 - 23:27
Why won' this light bulb turn on?
So I have an MR16 halogen light bulb like this one, 12V 75W, resistive (no LED).  I have a 12V, 10A power supply.  The bulb won't light.  I figure the bulb requires...
Saturday, 31 August 2019 - 16:20
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

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