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Seeking suggestions for temperature switches
I have an application where I'd like to turn a fan on and off based on a hardwired temperature.  The ideal device would have three pins:  Vcc, GND, and output, where...
Friday, 13 November 2020 - 23:50
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

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