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ROV Thruster 10,5 Lbs From DT700 Brushless Motor
You can use pretty much any toggle switch. I think my switch is rated for 230V 3A and has 2 prongs, I salvaged it from some old PC power supply. Just search "toggle switch" on ebay and you'll get a lot of options.
Yes, not discharging the capacitor will most likely kill the diode when you connect it. Lasers are also sensitive to electrostatic damage, you can sometimes kill them just by touching them.The other vulnerable part is the potentiometer, it might not be able to handle the dissipated power, although at only 20mA you should be still fine. Anyway, you can calculate the required resistor value for your desired current and simply use a fixed-value resistor instead of the potentiometer. You can use a calculator such as http://www.reuk.co.uk/wordpress/electric-circuit/lm317-current-calculator/ Lastly, you should put the diode into a proper focusing module/heatsink. It serves as a heatsink and also protects the diode mechanically.
Miniature Weather Station - ESP8266
How to Weather Wood FAST (Barnwood Effect)
Acoustic Tractor Beam
Arduino Data Glasses For My Multimeter
Technically yes, you should change the current set resistor on the TP4056 board. My battery is 800mAh and the default charge current of TP4056 is 1A, so in my mind it was good enough and I just left it like that.
Yes, it should work straight away on Arduino UNO and also on a Nano or Mega.
The sensor outputs 0..65535lx raw value, but to get the actual light level, you need to divide it by 1.2. So when fully lit, 65535/1.2 = 54612 lux. The BH1750 library does this automatically.
Concrete Metal Lathe
Soda Bottle Tetrapods
Itty bitty Joule Thief
LED Strip Control With Dimmer And Audio Pulsing Circuits
ESP8266 Weather Widget
Get Started with ESP8266 Using AT Commands, NodeMCU, or Arduino (ESP-12E)
Cheap and Easy Garage Workbench
Arduino Claw Machine
High performance Line follower Robot
3-Ingredient Pancake Balls
Inside the Engineer's notebook- A guide to pictorial sketches
TV Remote Controlled Paper Planes
Making Salt Water Taffy
Raspberry Pi as a 3g (Huawei E303) wireless (Edimax EW-7811Un) router
VinePro - Camera Head Mount
How To Create Custom Shirts With Bleach
DIY 2$ Dremel Router Attachment
Small Engine Lamp
Wooden Marble Coaster - from a single 2x4
The Basics of Closed Jar Terrariums
Ball Bearing Jib Arm w/ Motorized Pan & Tilt
Pocket laser engraver.
Small Arduino CNC
Light Painters Palette 2.0 - A complete guide
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3D Printed, Ultralight, 3-axis Modular Time-Lapse Motion Control System
K'netic Energy - K'nex Ball Machine