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Attach Zoom Lens to a Smartphone
Thanks for the link!
Arduino-based connected wake up and ambient light
Turn An Old Cell Phone Into A Smartwatch
Sunrise simulatorView Instructable »
Super Horn (Person-Powered Truck Horn)
How to Sharpen Used and Dull Drill Bits (By Hand!!)
LEDs and Lighting Class
Hello,Thanks for the encouragement.It looks like you're trying to make a high current buck-boost converter.I think you've reversed the drain and source pins of the P-channel MOSFETs for the buck stages. For the boost stages, you may want to drive their MOSFETs with the same driver used for the buck stage or drive them with a gate resistor in series with one of the microcontroller's PWM pins. Make sure that the mcu's total current isn't exceeded.
Measure RPM - Optical Tachometer
It's possible to make the project safer by using a lower voltage such as 12VDC and use low voltage halogen bulbs or LEDs. LEDs may be better because of faster response times. They're also more efficient.We can expect to save 10% assuming that's how long our eyes are closed for during our waking hours. This idea can increase the battery life of devices.
Why not set it so that if acceleration is increased, you need a delay before the brake light turns off? Half a second should prevent flickers.
Bar End Brake Light: BEBL
Wiring a Tactical LED for a...View Instructable »
You'll need a step-up converter which needs to handle an input current of around 4.2A. This converter can only step down.
There's a boost converter Instructable but you'll need to modify its circuit and code to become constant current instead of constant voltage.https://www.instructables.com/id/DIY-Boost-Converte...
I like how the LEDs were spaced. You can turn it into a signal light too.
15 watt LED Helmet Light wi...View Instructable »
What are their forward voltages and currents?If the 100W LED has a Vg of 34V and an If of 3500 mA, and the power supply is 36V with a rating of 4A, it should work on paper. I haven't tried 36V before.It's possible that you need to use a higher rating for Q4 and D3. L1 should handle at least 4A, D3 should handle at least 4A and 40V, C1, C4, and C5 should handle at least 50V, and Q4's Vds should handle at least 40V.
Sorry I didn't upload it before.
I can't find a P-channel MOSFET in SOT23 package that handles over 40V so I modified the circuit board traces so that Q4 would be in TO-220. You can use IRF540N.
Step-down LED Driver (Up to...View Instructable »
How visible is the 5050 strip in daytime?
Fixing Frosted Chalked and Faded Headlights
I'm sorry to hear that you've fried two Arduinos. Did you wire it correctly? I've damaged the Arduino before when I've printed a circuit board for boost converters. I think I've made a mistake of daisy chaining power and ground lines. Do you have a schematic?
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Transistor Instead of Relay...View Instructable »
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