• Simple two-wire speaker powered by Attiny85 and TDA2822M. Can play 16 different classical melodies.

• Simple two-wire speaker powered by Arduino Giga and LM386.

• Device you hold near a coil to see if it is switching or not.

• adafruit ina219 is used with attin85 and 4 digit display to display up to 3.2 amp current usage of target circuit

• Multiple sensors connected to Pico 2 W, data is broadcast to local server which runs visualization website locally.

• PWM fan speed control via attiny85 and bjt
• Non-pwm fan speed control with 555 timer and mosfet

• Goal: Build own vibecoded FM radio using SI4825-A10-CSR and TDA 2822M in BTL mode
• Project is split into two parts so that I can step-by-step ensure certain parts work:
  • Speaker Stage (Speaker, TDA, Pot and for now an Arduino Giga as sound source)
  • FM radio Stage (takes previous project and replaces Arduino with an FM radio source)

• Self-built TV remote (only on/off for now) for my Panasonic tv using attiny85 and IR LED

linear 5v hall sensor for easily measuring strength of nearby magnet (important announcement: i own a 11 mT and a 32 mT fridge magnet :)

simple compass shown on small oled screen. works surprising well unless you put a magnet very close

• Use rotary encoder, attiny85 and sn74hc595 shift register to select one of four LEDs.

• Attiny and DS18B20 powered active buzzer alarm that beeps at target temp or above (here 34 degrees celsius)