Arduino flashlight

"How far can we get with minimal effort?"

Features

• OLED screen displaying current power output (as percentage of maximum, seeing as there's no current shunt or sensor)
• several arbitrarily picked PWM levels
• four-button control - PWM level up, down, maximum power, soft power-off

BOM

• 5V Arduino Pro Mini

• 50W-100W LED

  • a radiator suitable for the LED
  • a lens + reflector kit suitable for the LED
  • CC/CV step up converter suitable for the LED

• 2x step down converter (5V for the Arduino, 12V for the fan)

• a power supply capable of supplying from 5W to 100W at 10-24V

• N-channel MOSFET, I used a IRF520N

• 0.96 inch, SSD1306-based OLED display

• 4 individual buttons, or a 4x1 matrix keypad

• assorted perfboards, headers, wires and connectors

If you decide to build the "enclosure" the same way I did:

• two pieces of wood, laminate, or any thin but strong material
• handle, 3d-printed. Consider mounting after assembly, so that you can balance your flashlight properly
• connecting pillars, 3d-printed.

Pinout

• OLED and Arduino powered by a step-down converter set to 5V
• Cooling fan powered by a step-down converter set to 10-12V
• Arduino pin A4 - OLED's SCK
• Arduino pin A5 OLED's SDA
• Arduino pins 2,3,4,5,6 to the keypad - 2 is common
• Arduino pin 9 to MOSFET's gate
• MOSFET's source to LED driver ground
• MOSFET's drain to LED's negative contact

Everything else should be self-explanatory.

Additional information

If you need to use the flip() function, you need to add this it Adafruit's library yourself. You can follow this guide for help.

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