7 second cutoff for mods?

[grantemsley]

I've made a box mods now. One is a simple 14500 battery with nothing but a switch and battery connector. The other is the evercool type one with a TI adjustable regulator.

One problem my brother has with both is he has a habit of falling asleep with the ecig in his hand or sitting nearby, rolls over on it pressing the button, and wakes up to a small burn on his skin and a dead atty.

So he's asked me to add some sort of cut off after say 7 or 10 seconds to prevent this. Anyone know a simple and compact way to do that?

 

[Timothy Cullen]

no idea on how to do the cut off best thing i think would be to wire in a master on off switch i mean it might be a little hassle for him at first to constantly flick it on vape flick it off but the pay off is no matter how hard you press the button it wont come on becuase even with a cut off its still gonna fire and all he has to do is roll a little of and back on the switch to get it to fire again ... master on off no firing at all in off and really its not that hard to do there are a ton of diagrams out there for wiring master switches and best place to do it i think would be madvapes

 

[grantemsley]

One of the boxes has a master switch.

He forgets to turn it off.

I'm hoping a technical solution will be easier than trying to make him remember. Apparently burning your leg in your sleep isn't enough to make you remember to flip that little switch when you are done.

 

[squeeze]

The only way I know that might work is to take the circuit board out of a battery with a 10 second cut off and hook it up in your mod.

 

[ThePuck]

Instead of a cut off, you could put a circular guard around the button so that of anything pressed down on it, it would hit the ring or guard first. The button could only be pressed if a person put thier finger in the center of the ring or guard. Anything flat pressing down on the box couldn't press the button.

Just a thought.

 

[Jensb]

you can use a microprocessor for this like attiny25. with this you can also a programming software for stable voltage and pulse. sorry my english is not good enough to explain everything

 

[Java_Az]

I would have to suggest to maybe telling your brother to Not Vape In Bed or maybe get in the habit of setting the PV on the night stand after using it.

 

[stouchon]

I used Raidy's mosfet touch switch idea. It seems to only fire when my finger is on it or when wet. Arms, legs or chests seem not set it off.

 

[Zen~]

how about a 555 timer IC?

555 timer IC - Wikipedia, the free encyclopedia

 

[o4_srt]

second the 555 timer.

or 2 AT42QT1010 capacitive touch sensor IC's wired in series, with sensors in different parts of the box. One sensing the palm, and another, the finger that would act to fire it. It would not work unless both sensors are triggered, and does not need any external contacts.

 

[Zen~]

second the 555 timer.

or 2 AT42QT1010 capacitive touch sensor IC's wired in series, with sensors in different parts of the box. One sensing the palm, and another, the finger that would act to fire it. It would not work unless both sensors are triggered, and does not need any external contacts.

I love that idea...

 

[o4_srt]

I love that idea...

That's what I am planning for my next mod, with no on/off switch. Vcc (input) of the chip is from 1.8 to 5.5 volts, and the output is Vcc - 0.7v. So if you power the first IC with 5 volts, it will feed 4.3 volts into the second, adequately powering it.

The first switch in series would be the palm sensor, the second one, the finger "fire" switch. Current draw on these chips is in the uA range. In conjunction with a MOSFET and regulator, there should be minimal leakage current when neither is triggered. (MOSFET's also have a leakage current in the uA range).

Still trying to figure out how to incorporate the MOSFET into the circuit, but the AT42QT1010 IC works great when triggering the inhibit pin of the PTR08100w power module from the evercool mod. Only drawback in this operation is the PTR08100w still draws 1 mA, even when inhibited.

 

[Zen~]

Only drawback in this operation is the PTR08100w still draws 1 mA, even when inhibited.

That's a fairly moot point given that the batteries will be changed pretty much daily, isn't it? The 1ma draw is going to shorten the charge life by a pretty miniscule amount, in the grand scheme of things. It would be a lot different if we expected the batteries to hold that charge for weeks on end.

I've been breadboarding some evercool based circuits,and I've been just ignoring the inhibited draw simply because I didn't see it as being an issue... am I overlooking some other reason of concern?

 

[o4_srt]

That's a fairly moot point given that the batteries will be changed pretty much daily, isn't it? The 1ma draw is going to shorten the charge life by a pretty miniscule amount, in the grand scheme of things. It would be a lot different if we expected the batteries to hold that charge for weeks on end.

I've been breadboarding some evercool based circuits,and I've been just ignoring the inhibited draw simply because I didn't see it as being an issue... am I overlooking some other reason of concern?

Might be a moot point to most, but if you leave it on overnight, the batteries will be dead. That 1 mA of current will kill a battery in roughly 10.5 hours, with no vaping. That's using the inhibit pin to keep the regulator off.

With the touch sensor IC running at 2 volts, in LP mode, it draws 20 uA. A MOSFET that I have been playing with has a leakage current of 25 uA. It would take approximately 233 hours to drain a (900 mAh) battery when the regulator is powered using a touch sensor/MOSFET switch on Vcc instead of using the inhibit pin.

That's reason enough for me.