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That looks good - i suppose if the frequency is high enough all is ok? I have messed with those little pwm boards they are really good and cheap too - there is a version with a dial to make it easier to adjust the frequency or duty

Updated to deal with the fluctuating input voltage - i set the max watts to 80 and the max duty cycle gets adjusted accordingly to try and keep at the correct wattage no matter what the input voltage. Should also compensate for battery sag but if you set the wattage too high for the voltage...

Im not sure how well pwm will work with the little zvs circuits as they create an oscillation which pwm may not be compatible with.

Finished off my desktop replacement - well more my general use device while i play about with better housing as its not tied the mains anymore. The thermocouple cable is on the wrong side side need to rewire that but but otherwise is nice a neat and not a load of wires everywhere. Also only...

Was going a bit mad and went for 4 lipos - test 1 was good So decided to just film the screen on test 2 Gutted already killed one but this happened before with the normal pico and i wasnt sure what went wrong this time im sure the coil just burnt through the ptfe and shorted out the...

Sure its on the other thread but here you go: https://github.com/highvaper/heater-controller

I had a bit of experience with full blown pi's when i started the project off and someone at work i chatted with was a bit of a pico fan so have kind of just rolled with it - the documentation out there is really good too so that always helps. I suspect if i started from scratch i would...

Not just estimates - real time power consumption now - there is a live volt reading and knowing the restance of the element it works it out live - quite cool to watch it adjust power in watts and not the arbitrary level of 0 to 10 for the pwm - there is now a temp/watt graph Yea all regulation...

Up and running off the same power source as the heater That's all the actual components now need to figure out better housing and make some updates to code to enable the buttons and other minor updates.

PCB v2 done and delivered - its a bit bigger than i wanted it to be but it does have a lot on board With the screen and a connector not soldered yet I decided not to have any of the through mount stuff done and will then allow for flexibility when connecting up. Some highlights Built...

DC Gen 2 Dry Herb Heater - under $40 and is amazing value

Check out page 2 of this thread for thermocouple measurement and induction heating issues: https://fuckcombustion.com/threads/bakx-heating-principle-inspired-desktop-vape.54964/page-2 I have had a little dig into IR measurement but it didnt fit my needs.

Dam it got a lot done added some code to automatically adjust the max duty cycle based on the live input volt/battery reading and so limit to a set maximum watt but update as the battery sags - or if using a car battery and someone starts the car causing a voltage rise. Well it could until i...

Ah true - i forgot all about it tbh - the wall is so thin there is little lag too - thats something i find there is a difference between 1mm to 1.5mm wall inner tube and/or stems

i think the outer tube really helps concentrate the heat back in from the other side of the ribbon compared to the bare element around the simple tube were it just floats away

Ah the main thick outer heater tube and inner liner tube? - there is basically just enough room to fit the nichrome and thermocouple cable

I am not clear which gap you are referring to When using with the inner liner there is a gap between the stem and inner liner tube - this depends on the the inner liner wall tickness - at the moment i have been using 1mm quartz ones and also the 1.5mm glass test tubes - i plan to get 1.5mm...

thanks - nice to know people are reading my ramblings with 3 batteries and no limit after about 30 secs yes they start to glow but not like a toaster - but it gets up to temp so quickly with 3 batteries that its quite easy to prevent it - just fire for a few secs and give the heat a chance to...

Been messing more without the inner liner and with 3 batteries its pretty amazing - so fast like you put the stem in hit the button while inhaling and before you have filled you lungs its vaping away. You cant over power it like other convection vapes - really there is no chance - if you keep...

My first cockup with it - i was using it with the tm2 water adaptor so no inner tube liner - the bong i have suffers bad blow back so when you stop pulling the water bounces back up the tube the stem sits on to - so causes a reverse air blow and weed pushed out the stem. Not good against very...