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The efficiency drops off the higher you try to boost it. 18V worked for me 5V to 36V might be too much.This circuit isn't appropriate for reducing voltage. A transformer-based power supply would probably be better of 220->36V. Dealing with 220V is dangerous; you should consult an expert (or become one!).
Thanks for the tip; when I started out, I didn't realise how important the high frequency would be and I was too lazy to add a crystal :-)
The code is in the instructable with a link to the github page. It's for an ATTiny84, which is pretty close to an 85.
3D painting: Layered Resin and Acrylic Paint
3D Printed Wireless Lantern
I had a similar issue of where to put a switch when I was building an LED fireflies-in-a-jar project. I ended up putting a jiggle switch inside; shake the jar to wake up the fireflies
My number one recommendation is to start simple. Break the problem down into a few pieces and solve each one separately then think about how to combine them. You might want to start by reading a voltage using an analog input and writing that to the serial console.Then try the other half of the circuit, try outputting a pulsed signal at a fixed rate.Then put that together with the analog part of the circuit; you should be able to adjust the output voltage by changing the pulse rate.Then start to put those pieces together and control the rate from the analog input. One note: my code is for a more basic chip. It should be a lot easier to program an Arduino to do PWN and to read the input. Look up analogRead and analogWrite.
workbench with reclaimed tabletop
3D Printing and CNCing Weird Freeform Lenses
Giant Squid Costume
Weeping angel or statue costume
Animatronic Hocus Pocus Spellbook Prop
Make a Mickey Mouse Pumpkin this Halloween
EYE CAN SEE YOU
Sugru Overmolding Using 3D Printed Molds
Big Daddy "Bioshock"
Robot Mask with Neopixel Eyes, iPhone Mouth, and Voice Changer
Hardwood hair combs on the scroll saw - Made at Techshop
Soldering tiny SMD components the easy and fast way (with a hotplate)
Chocolate Toffee Cookies
Oak Bedroom Set With A "TWIST"
DIY Origami Leaf
Best Ever Chocolate Chip Cookie Recipe
Arduino Laser Engraver
Hardwood Chopstick Rest