Archive for the ‘computers’ Category:

2018-06-20 Don’t Ask To Share Software!

From FB group Arduino Projects Marcos Tulio Junior I think it is unethical for others to expect the coder to reveal his IP (intellectual property). There is nothing wrong with asking the coder for a link to open source software. But you are out of line when you expect others to do for you what

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2018-05-10 Malicious Chrome Extensions Again

Ars Technica article https://arstechnica.com/information-technology/2018/05/malicious-chrome-extensions-infect-more-than-100000-users-again/

2018-01-30 Elijah And His Unique Keyboard

At the college I worked at, they had a part-time internship program where students could get on the job experience for a semester.  One of our employees got her son a job as an intern in our department. His name was Elijah, but he didn’t like being called that, and went by “EJ”.  He was

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2017-09-23 Cellphone Charger Secret Circuit

Posted to FB Arduino group Sep 23 Mbihi Oliver Four hours is twice as long as 2 hours with the correct charger.  Here is a secret many don’t know:  Smartphones don’t necessarily charge at maximum, especially if they’re charged by a charger not made for their phone. Smartphones often have a sensing circuit that checks

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2017-09-19 Giant ‘Analog Meter’ For Clock Display 

FB comment “Brilliant!” Preet Sangha said, and I agree, but since I have a hard time seeing small meters across the room, I thought up another, bigger meter.  How about this? Instead of meters, use a printout of a meter face, full page size.  There will be one for each hour, minute and second.  These

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2017-09-10 How Long Can An Arduino Circuit Last?

My answer to a FB Arduino group question on Sept 17 Dan Rogers has the right idea.  The protoboard, with all the holes in it, was never meant to be permanent.  The contacts in each hole lose their springiness as they are used to hold wires.  The contacts can become intermittent after awhile.  As time

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2017-09-01 Automated Gallows – Arduino 

Suggestion for project on FB group Arduino Projects – Sept 17 Automated Gallows! A motorized winch adjusts noose. Asks for three officials to each press confirmation button. Has an emergency abort button. Counts down 5, 4, 3, 2, 1… Pulls the trapdoor latch! Monitors heartrate until no sign for 5 minutes Lights up sign “Execution

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2017-08-27 A 555 Is Easier And Cheaper Than a PIC

From a FB group post. “primitive transistors” I think that’s ironic.  The 555 makes the design easier for the builder.  It has all the parts so the builder doesn’t have to build from scratch.  Like making a cake using Betty Crocker’s cake mix instead of flour, eggs, etc, and no need for a recipe.  It’s

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2017-08-06 Seeing Digital Signals

From FB post about Arduino driving a ‘HC595 chip. You don’t need an oscilloscope to see digital signals.  If you slow down the speed, you can see what’s happening by looking at LEDs.  Everything is digital, just on or off. Plug two red LEDs, transistors, and current limiting resistors for LEDs (330 ohms), and for

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2017-07-12 It Worked!  Arduino Pro Mini Programmed

This homemade PS is smaller than an ATX PS, but the best thing is it’s quieter, because no fan is runningThis homemade PS is smaller than an ATX PS, but the best thing is it’s quieter, because no fan is running.

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