Little things that go wrong...

Who has shorted the 5Vdc supply to GND on the Nano?

And now it does not even show the power LED, or it is on very dim?
You simply destroyed the MBR0520 diode, labeled D1 in the "+5V Auto Selector" circuit on the board.

How to fix?

Either order another replacement MBR0520LT1G, 0.5A, 20V, Schottky Diode, or promise yourself to never, ever short Vcc to GND again and solder a jumper in!

Diode labeled B2

Getting less expensive Arduinos from Ebay?

Well, a lot of times the USB connector is not soldered properly and you get intermittent power or data to the ATMEGA chip.

How to fix?

Touch all the pins up with a solder iron and flux.

Roll-up Doors with a State Machine

Roll-up a door please! (with a State Machine in code, part 1) MHO Junction’s Molson Brewery in a 3D Layout View ( all photos and drawings by Lloyd Henchey, Ontario, Canada) We all know we can open and close close something with an Arduino and a Servo, but what if we want to a little bit more operating fun with some lights and sounds, all after a manager gives approval to open or close the door to the beer brewery before your engine is allowed to pick up or deliver a car? Control Panel at the brewery Six doors under construction at the Molson brewery on the MHO Junction Engine pulls up to the red light, shift manager (operator) grants permission, door raises up with alarms and a flashing red light, door goes all the way up, light turns green , engine or car can proceed! Same flashing red light going down and maybe different door squeaking noises. All good articles start with a YouTube video: youtube.com/watch?v=-8EnpUgTqR4 ! This article will introduce you to a “Finite State Mac

Pi Pico, we smell competition in the land of the RRRduino!

Pi Pico on an N-scale gondola Pi Pico, we smell competition in the land of the ‘duino! Our very favorite low cost microcontroller system is seeing some fresh competition. Everyone by now has heard about the Raspberry Pi, some fruity company in the United Kingdom, making single board computers! They run Raspbian (or other flavors of Linux and are capable of some Windows versions) for as little money as $10 for the Pi Zero W. The more popular Model 4, with 2 GB of RAM, retails for about $29. Add a $5 micro SD card and you have a real computer with which you can surf the internet, write code and even program Arduinos. It also runs our other favorite, JMRI. Of course, plug it into a small or big screen television with an HDMI cable and you can even stream Netflix. If you want a really cool computer built into a keyboard, also check out the brand new, Raspberry Pi 400 , you might just think you own a ZX Spectrum again. These are all “computers” with processors and now the Raspberry

Not too important IR remote info...

Onn 4-Device Universal Remote manual... setting codes... Up Arrow TV Mode: Decoded NEC(1) : Value:20DF00FF Adrs:0 (32 bits) Raw samples(68): Gap:5484 Head: m8800 s4500 0:m550 s600 1:m500 s600 2:m500 s1700 3:m550 s550 4:m550 s600 5:m500 s600 6:m500 s600 7:m550 s550 8:m500 s1700 9:m550 s1700 10:m500 s600 11:m550 s1650 12:m550 s1700 13:m550 s1650 14:m550 s1650 15:m550 s1700 16:m500 s600 17:m500 s600 18:m500 s600 19:m550 s550 20:m550 s600 21:m500 s600 22:m500 s600 23:m500 s600 24:m550 s1650 25:m550 s1700 26:m550 s1650 27:m550 s1650 28:m550 s1700 29:m550 s1650 30:m550 s1650 31:m550 s1700 32:m550 Extent=67100 Mark min:500 max:550 Space min:550 max:1700 CBL Mode: Decoded RC6(4) : Value:2758 Adrs:0 (20 bits) Raw samples(36): Gap:43150 Head: m2600 s900 0:m350 s900

Everything Model Railroad and RRRduino!

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