I'm quite new to arduino and the realm of ITD so I'm here to ask for guidance on how I should make my circuit and what components and software I should include.
My project is basically a heating straw, which uses a peltier module to short a small piece of metal that goes on the users mouth and heats up to around 35C but nothing more.
My peltier module requires 6V and operates at 2A, and the max heat is 65C, hence I realised that I needed a 'PWM' to regulate the temperature with the help of a temperature sensor.
I had tried plugging in the peltier into an Arduino UNO powered by USB: although it heated up to 35C, it quickly stopped working and would overheat the board instead. I have no idea why, but I think I didn't have the right voltage or current to supply into the peltier, nor any inductors.
Hence I am resorting to a lipo power source, but I heard peltiers are pretty power hungry so it wouldn't be very smart to do so. However, I'm just unsure on what I should do to properly power the peltier.
Moreover, I am confused about what elements I should have in the circuit: I've seen in other forums to use MOSFET but I'm not entirely sure what that is..
Currently, I'm using an Arduino nano and a step-up converter for a 3.7V lipo, have I made the right choice? Don't really know what to do after this though..
One rules is: Don't use any controller as power supply. A few LED might be okey but not more.
Operating a Peltier or a motor is not much different. It's about power control. Lots to fiind in forum.
What do i use instead of a controller board then?
Use external power supplies.
@69anyagirl
You can use this MOSFET module with the 3.7V battery and see if it gets hot enough.
If not then use the step-up converter.
Have you found any successful projects that use PWM to control the Peltier? I hope you have several devices in hand while you are testing.
I've made a circuit diagram (the led represents the peltier) but it isnt turning on.. i dont know why..
Post your code using code tags <CODE> just click on the icon
What is the MOSFET part number?
You have R1 connected wrong. It should be between the MOSFET gate and D9
You need a resistor in series with the LED
And the led is upside down...
This doesn't make much sense.
A "straw" I would interpret as a cylindrical object, probably hollow. Like a drinking straw. Apparently yours is for heating. What's it supposed to heat? Or does it only have to heat itself (i.e. "self-heating straw")?
What do you mean by "to short"? We're not talking about an electrical short circuit here, since a Peltier element is not a switch. Is the Peltier element thermally connected to the straw? How? What material is the straw made of?
Can you post a diagram or photograph of the setup as you envision it?
Also, what's this device supposed to accomplish?
65C is quite painful on the sensitive tissues of the mouth. Given your level of experience, please don't think about bringing your project into actual contact with a human being for the foreseeable future.
For a Peltier module to be useful, you need a heat sink. This setup and tutorial from Adafruit will help get started (works for heating too).
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