I got a pretty nice idea, which involves heating some water (kinda like a coffee maker).
I don't need any large amounts, one liter should be enough, but how can I get it to about 90 - 95°C and so it can still be drinked?
I was thinking maybe I should borrow the heating element from an old coffee maker, but I thought to make this thread, if there is any other way.
Or if I could buy just the heating element somewhere... No need to buy a whole coffee maker.
I think I must use a big heating element like those 1kW coffee makers? Even the best 12V coffee makers can take over 20A, which is pretty much... (and still just ~250W power).
Also, what kind of tubing will handle around max 100°C water? And doesn't dissolve anything to the water so I can still drink it?
Thanks, that's almost what I was looking for but I need also around 7 - 12V for an Arduino, that's why I was thinking using a coffee maker.
I think coffee makers have a little control PCB in there, which runs on around 12V, which I could use to power Arduino, without a need for external PSU or converter / regulator.
I think I'll disassemble some old coffee makers tomorrow, if I find any of course...
I would guess that all coffee makers use mains-voltage heating elements with relays or SSR's to turn them on and off. They simply are not big enough to have the 110-12 V multi-amp transformer required.
Deltac0:
Thanks, that's almost what I was looking for but I need also around 7 - 12V for an Arduino, that's why I was thinking using a coffee maker.
I think coffee makers have a little control PCB in there, which runs on around 12V, which I could use to power Arduino, without a need for external PSU or converter / regulator.
Normal Coffee makers run on 120/240V single, there is no low voltage inside. Some of the more advanced ones with timers etc. have a low voltage, but this voltage is NOT isolated from the mains, so if you connect to that you're getting yourself killed sooner or later, so DON'T toy around with it!
Zapro:
Normal Coffee makers run on 120/240V single, there is no low voltage inside. Some of the more advanced ones with timers etc. have a low voltage, but this voltage is NOT isolated from the mains, so if you connect to that you're getting yourself killed sooner or later, so DON'T toy around with it!
// Per.
Mm'kay, you made your point clear. And yeah, I was thinking one of those cool timer/IC boards...
How can I then power Arduino from the same wire, let's say 240V?
Do I really need an DC adapter to 12V and I would also need to split the 240V for the heating element too?
I also need to power a few servos and maybe a 5 - 12V dc motor. I think I also need a relay for the heating element (which maybe needs to be controlled by transistor)?
Zapro:
Normal Coffee makers run on 120/240V single, there is no low voltage inside. Some of the more advanced ones with timers etc. have a low voltage, but this voltage is NOT isolated from the mains, so if you connect to that you're getting yourself killed sooner or later, so DON'T toy around with it!
// Per.
Mm'kay, you made your point clear. And yeah, I was thinking one of those cool timer/IC boards...
How can I then power Arduino from the same wire, let's say 240V?
Do I really need an DC adapter to 12V and I would also need to split the 240V for the heating element too?
I also need to power a few servos and maybe a 5 - 12V dc motor. I think I also need a relay for the heating element (which maybe needs to be controlled by transistor)?
You power your Arduino from a DC-Wallwart that supplies it with 7,5V optimally (then you don't waste all that power in the voltage reg.)
You control the Coffee maker from a SSR, like this http://goo.gl/E4k8p
Zapro:
Normal Coffee makers run on 120/240V single, there is no low voltage inside. Some of the more advanced ones with timers etc. have a low voltage, but this voltage is NOT isolated from the mains, so if you connect to that you're getting yourself killed sooner or later, so DON'T toy around with it!
// Per.
Mm'kay, you made your point clear. And yeah, I was thinking one of those cool timer/IC boards...
How can I then power Arduino from the same wire, let's say 240V?
Do I really need an DC adapter to 12V and I would also need to split the 240V for the heating element too?
I also need to power a few servos and maybe a 5 - 12V dc motor. I think I also need a relay for the heating element (which maybe needs to be controlled by transistor)?
You power your Arduino from a DC-Wallwart that supplies it with 7,5V optimally (then you don't waste all that power in the voltage reg.)
You control the Coffee maker from a SSR, like this http://goo.gl/E4k8p
// Per.
But I would still need to split a 240V line to 2 cables, one to Arduino and the other to the coffee maker. I would like to have a compact/fairly small 1-cable solution:
240V AC input -> 7.5V DC output for Arduino and 240V AC output for the coffee maker heating element controlled by Arduino.
Thanks for the relay tip, you think Arduino could handle it without transistor?
Put it into a small project box, observing isolation distances from 240V to low voltage parts!!!
The SSR is like a LED with a built in resistor. It will not load the output on the Arduino much less than a LED and fitting resistor, so no need for anything extra. You can connect it up directly.
Zapro:
Put it into a small project box, observing isolation distances from 240V to low voltage parts!!!
The SSR is like a LED with a built in resistor. It will not load the output on the Arduino much less than a LED and fitting resistor, so no need for anything extra. You can connect it up directly.
// Per.
Zapro:
Put it into a small project box, observing isolation distances from 240V to low voltage parts!!!
The SSR is like a LED with a built in resistor. It will not load the output on the Arduino much less than a LED and fitting resistor, so no need for anything extra. You can connect it up directly.
// Per.
Thanks!
I'm a little tired... So simple, but effective solution... I like it.
I was worried about the SSR because I've read that Arduino can't supply enough amps to open those normal relays, but I think SSR is a little different. (It seems to require just under 5mA to open it, which is good)
You could also look into engine block heaters for vehicles if you need more heat. They get pretty hot, and go for about $20 on Amazon. Theres a bunch of different kinds, some are just heating elements that are made to go inside frost-plug holes, others are just large blocks with a magnet on one side to stick to the engine (usually the oil pan), and others are designed to mount in-line with the engine coolant system to heat it up directly.
michinyon:
You can't drink water which is 90-95 degrees. You will burn yourself.
Just couldn't let it slide, could you
If you need more power, any decent hardware or home improvement store will have heating elements for electric water heaters. They'll be quite inexpensive for the wattage and assuredly safe for potable water.
I think I'll go with the coffee maker's heating element and separate power for Arduino, which controls the element with SSR.
And yeah, I meant closing the circuit when I said open... Another example of me being tired.
And I need the water to be hot so all the good taste can absorbed into it (but NOT boiling).
