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You'll likely do less damage de-soldering it than trying to snip it off. Use a de-soldering pump to remove as much molten solder as you can, then heat again with de-soldering braid to wick up the rema …

Done this way, the Arduino's pin driver only needs to supply enough current to switch the transistor; the current to power the LED is provided by your external power supply. …

Hold the reset button while you start the upload. Wait until you upload first tries to connect to the Arduino, then release the reset. If you can't get that to work, the next option is to load anoth …

Those 9v batteries are not known for their ability to supply current. Their best uses are long-term powering of low-current standby devices like smoke detectors. I'd first try replacing it with 4 doub …

If you can tolerate a decreasing flow as the pressure in the bottle drops, a simple restrictor (fluidic equivalent of a resistor) will limit the flow but of course, I = E/R; the flow will be proportio …

Steppers require current - and power, due to I^2*R losses) to hold a position. Power off, they free-wheel. What kind of efficiency do you need? A stepper might not be the most power efficient. …

There are solid-state relays (such as this one) capable of switching the currents - 40A - you're talking about and may be a better choice than a mechanical one. Note that it will probably need to be m …

What you need to avoid is trying to power the motors through the Arduino. Your first photo has it right. … Some of that will have to go to power the Arduino (you can use the power supply's USB port for that), leaving a little less for the motors. …

If it's the former, the servo will draw more current than an Arduino can deliver so you'd need a separate power supply. If it's the latter, you can get away with it. …

On Arduino Uno (and most basic Arduinos), the 'L' LED is operated by whatever code is on the Arduino. RX and TX flicker whenever the Arduino is sending data to the PC (TX) or is receiving data from th …

Most computers will sense that short and disconnect power to that USB until the short goes away, but you don't want to count on it! …

"Quite a bit of power" is a rather vague specification. A USB port can supply 500mA unless the device in question negotiates for more current and the port in question is capable of supplying it. …

A 5v power supply could be designed with a larger input range, even including voltages less than 5v, but the simple design used on the board covers a range of sources at a lower cost than a higher-performance … power supply. …

The Trinket really doesn't want to see 15v across one of its I/O pins. You'll do better using a solid-state (SSR) or mechanical relay to close the 15v motor-start circuit, one that can be activated by …

Any of the pico-power AVR chips draw very little current in sleep mode - in the 10s of micro-amps for the 328, if I recall correctly. … What you would need to do though, is to provide a much more efficient regulated power supply than the one built onto the Arduino board (if that is what you'll be using). …