I originally posted these plans to reddit, shortly after finishing my v2 version of an induction heater. They are still a solid set of plans, and include an improved wiring diagram.
IMPORTANT: THESE PLANS ARE UNSUPPORTED! Feel free to use them to make your own heater, but I will not be able to help you troubleshoot your attempt. Thanks for understanding.
These plans include using a 12 mm x 12 mm Arduino 'tactile' input switch as a triggering mechanism, installed in the base of the coil. This switch is normally open but closes (and activates the circuit) when the vapcap is inserted in the induction heater opening and lightly pressed down.
Use a small dab of hot glue or epoxy to mount the switch to a 25 mm square Zip tie "sticky base."
Drill a hole through the base where you want your switch, then install the mounted switch over the hole. Run the wires through the hole and under the base.
Heater: Yosoo 5V-12V ZVS Low Voltage Induction Heating Power Supply Module With Coil https://www.amazon.com/gp/product/B01C71XKZ6/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
Similar units also available on AliExpress, eBay, etc.
Master Power Switch:
My original 'big red switch' was a pull from an Epiphone Valve Junior guitar amplifier, left over from an earlier project. It looks nice, but it's nothing special - any latching (i.e., non-momentary) single pole/single throw (SPST) switch will do. This site has some switches that look pretty good and could work
I used a 12mm x 12mm Arduino tactile (momentary) switch. Mine is hot-glued (or epoxyed) to a Zip tie "sticky base", (foam tape removed), screwed to my board.
I kept the stock Arduino switch button and trimmed its edge to fit inside the tube. There is a small segment of 7/16" wooden dowel inside the tube to achieve the correct height.
MOS FET trigger module: 15A 400W MOS FET Trigger Switch Drive Module PWM Regulator Control Panel https://www.ebay.com/itm/MOS-FET-Trigger-Switch-Drive-Module-PWM-Regulator-Control-Panel-15A-400W-NEW/331961560311?hash=item4d4a736cf7:g:7IsAAOSwEzxYeEwQ or similar. Just search for the above part description, you'll find the right one. It's a popular Arduino circuit, eidely available on Amazon, AliExpress, eBay, etc.
If you plan on using a momentary switch, this is the way to go. Don't make the momentary switch directly supply the heater current.
Although, seriously, if you can't solder this probably isn't a good project for you.
The above links are intended to show the correct parts, but may not be the cheapest or fewest quantities. They may also go dead at some point.