Simple dimmer controlled with push buttons, using Digispark ATtiny85 and IRFZ44VPbF Power MOSFET for 12v LEDs

readme.md

DIY simple dimmer, using Arduino IDE and cheap components

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Introduction

this guide should help you to build button-controlled light power steering. Project is not complicated, so it should be begginers-friendly

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Sheme

FULL SIZE IMAGE

Ingredients list

• digispark board with ATtiny85
• push buttons *2 ( can be replaced with single tristate momentary switch )
• Power MOSFET ( IRFZ44VPbF by InternationalRectifier or similar supplemet )
• 8.2KOhm resistor *2 (both can be replaced with 10KOhm)
• 12v power supply
• 12v powered LED stripe
• some wires and prototype board

...from this place this gist is =="in progress"==, but so far it should be mostly enought to build it

but it will be prittier and better written next time when i will have free time... i hope TODO: circuit sheme, usefull knowledge references, user experience test, more text

after all

First prototype

FULL SIZE IMAGE

dimmu-brightir.ino

/* 
    Simple dimmer controlled with buttons
  Sarverott @ 2023
   
   https://gist.github.com/Sarverott/3b352c6c3fe1c3d13f3faf642cc3b23c
   
  this project ingredients:
    - digispark board {
      ATtiny85 :: [ Flash memory = 8kb ; frequency = 16MHz ]
      Board operational voltage = 5V
      ( microUSB B version )
    }
    - push buttons *2 (can be replaced with single tristate momentary switch)
    - Power MOSFET [ IRFZ44VPbF by InternationalRectifier ] (or similar supplemet)
    - 8.2KOhm resistor *2 (both can be replaced with 10KOhm)
    - 12v power supply <IN>
    - 12v powered LED stripe <OUT>
    - some wires and prototype board

  NOTE: 
    In both cases, whether soldering or using a contact plate, 
    I recommend using goldpin connectors:
      - between the power supply and dimmer
      - between dimmer and the led strip

*/

const int pwmPin = 1; // output to controll MOSFET with PWM signal

const int lightButton = 2; // LEDs brighter button
const int darkButton = 0; // LEDs dimmer button

byte lightVolume = 255; // current light power (scale 0-255)

void setup() { // this is preparation

  pinMode(pwmPin, OUTPUT); // set output pin for MOSFET

  pinMode(lightButton, INPUT); // set input pin for button
  pinMode(darkButton, INPUT); // set input pin for button

} // start routine

void loop() { // this is routine
  analogWrite(pwmPin, lightVolume); // update current brightness

  int lightButtonState = digitalRead(lightButton); // read light increse button
  int darkButtonState = digitalRead(darkButton); // read light decrese button

  if(lightButtonState == HIGH && lightVolume < 255) // if increse button pressed and light level below maximum
    lightVolume++; // light level +1

  else if(darkButtonState == HIGH && lightVolume > 0) // if decrese button pressed and light level above minimum
    lightVolume--; // light level -1
    
  delay(10); // wait 0.01 seconds
} // repeat routine