Something I was making for Halloween. It has a potentiometer that you turn to switch the mode of the LEDs from flicker, pules, or solid. I used an arduino to program the ATTiny85. Ones I finished it I ended up giving it to a friend so I am not 100% sure on the capacitors. Anything close to 450uF should be fine and depending on the power supply you may not need them at all.
2 resisters (10 Ohms hook to LEDs and 470 Ohms hooked to potentiometer)
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.