Here are 15 amazing project ideas you can create using the ATtiny85 microcontroller: LED Matrix AnimationProgram an LED matrix to display scrolling text or animations using the ATtiny85. Miniature Digital ThermometerBuild a small thermometer using a temperature sensor like LM35 or DS18B20 and display the data on a tiny OLED screen. IR Remote Control SystemDecode signals from an IR remote to control LEDs, fans, or other appliances. Sound Reactive LightsCreate an audio visualizer where LEDs blink in response to sound or music using a microphone module. Capacitive Touch SwitchMake a touch-sensitive button using a conductive surface and the ATtiny85, perfect for smart home switches. Portable Motion DetectorUse a PIR sensor to build a portable motion detection alarm system for security purposes. USB Volume ControllerTurn your ATtiny85 into a USB HID device to control your computer’s volume with a rotary encoder. Tiny Weather StationMeasure temperature and humidity with sensors like DHT11/DHT22 and display the readings on an OLED. Ultrasonic Distance MeterUse an ultrasonic sensor to measure distances and display them on a small display. Blinking Bicycle LightCreate a small, energy-efficient blinking tail light for a bicycle, powered by a coin cell battery. Minimalist USB Game ControllerBuild a simple game controller for Retro-style games with buttons connected to the ATtiny85. PWM Fan Speed ControllerControl the speed of a DC fan using pulse-width modulation and a temperature sensor for feedback. ATtiny85 Robot BrainPower a small robot with an ATtiny85, controlling motors and sensors for basic navigation. Night Light with Light SensorCreate an automatic night light that turns on in low-light conditions using an LDR and LEDs. Tiny Digital StopwatchDesign a simple stopwatch with start, stop, and reset functions using push buttons and an OLED display. These projects highlight the versatility of the ATtiny85 and can help you learn more about electronics, programming, and sensors. This site is hands down the best for projects related to ATtiny85. So, definitely check it out.