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Anybody know about swimming pool electric valves?
Situation: our temperature controller for our solar heated swimming pool isn't working, and it's a real pain to manually switch the valve back and forth to maintain a nice...
Monday, 10 June 2013 - 16:45
How wide do you make your SMD IC pads?
I'm more software than hardware, so I'm looking for some advice here. One rule I found at some IC manufacturer was to add 0.1mm to the pin width if the pin spacing was > 0.5mm,...
Friday, 17 May 2013 - 01:14
What if the input voltage to a boost regulator is too high?
Suppose I have a small boost regulator to bump up 2 AA cells to 5V, and I want to extend the battery life by going to 3 AA cells (4.8V with fresh batteries). This is outside the...
Monday, 29 April 2013 - 23:42
GPIO input response to analog voltage?
I want to use the "even" 3 pins of the 6-pin AVR ISP to power a Mega48 device and also to provide an analog control voltage on pin 4, which connects to MOSI. Unfortunately, for...
Monday, 22 April 2013 - 17:50
What's the minimum acceptable reset circuitry?
I've always used an external resistor and capacitor on the AVR reset pin, but now I have a very small board that would benefit from losing one or both of those components, if...
Wednesday, 20 March 2013 - 18:53
Electrically sync a mechanical clock?
Recently I picked up a big mantel clock for $5 at a garage sale down the street. The clock uses a hidden pendulum. Like any mechanical clock, with much fiddling it can be made...
Wednesday, 26 December 2012 - 05:28
Need a cheap micro-friendly force sensor
I need a sensor that can detect a person stepping on a platform. The platform is not attached to a floor, so the sensor could be between platform and floor. Any ideas as to what...
Monday, 3 December 2012 - 22:06
Need 48V 2A H-bridge
For a one-off test box I need an H-bridge capable of 48V and 2A. I'd like to drive it with 3.3V logic. Cost is by and large irrelevant. Any suggestions? Thanks. EDIT: The...
Thursday, 8 November 2012 - 18:09
Suggest a few all-purpose switching regulators?
I have a few applications for switching regulators, and I haven't used them before. The requirements vary, which is why I mentioned all-purpose, but that's not a hard requirement...
Monday, 1 October 2012 - 16:42
What wears out EEPROM - erase, write, or both?
Seems like I should know this, but I don't. What does the EEPROM 100k cycle limit refer to? Erases, or writes, or both? In particular, if I erase an EEPROM location, I will have...
Thursday, 23 August 2012 - 18:29
Configuration via power cycling?
I may have a requirement to send a small amount of configuration data (
Thursday, 23 August 2012 - 15:35
Switchmode wall wart safety?
With modern wall warts (switchmode converters), the power switch is on the DC side at the equipment, not the AC side. How safe are these things when left plugged in indefinitely?
Wednesday, 25 July 2012 - 17:26