Introduction: Cheap Hot Air Station With Arduino

Picture of Cheap Hot Air Station With Arduino

first , it's my first instructable and i'm not native in english so be gentle

I had an idea weeks ago , build a hot air station for cheap , very cheap , i don't need a big stuff just a little station for few soldering.

i've find on ebay the 858 hot air station but to expensive for me, so i just buy the handle for 8 euros! and i have built a circuit with a arduino to control this handle.

lets go!

Step 1: Study the Handle !

Picture of Study the Handle !

The handle comes with 8 pins:

2 wires for the heater , it works with 220v ac ( i dont know for 110v) it is the grey and the white wire.

2 wires for the 24v dc fan plus is blue ans gnd is brown

1 wire for the reed switch the green

1 wire for the earth the yellow

2 wire for the thermocouple red (plus ) and black

now how to control this?

i will separate in section the rest of the project

first the heating

Step 2: The Heating Control

Picture of The Heating Control

the objectif is realy simple : start and stop the heating with a logic command of 5v .

But we can't do that with 220 vac easily the solution : a triac and an optocoupler,

tric is like a relay but static , it is control by an optocoupler to secure the rest of the circuit.

it is done here with a moc3063 and BTA140-800

Step 3: The Fan Control

Picture of The Fan Control

the fan works with a 24vdc, it must be activated always when the gun is hot .

we have two commands: the first is to power on the fan with the arduino it's a simple transistor . the second is a potentiometer to control the speed .

note: here the components are not the best, i take what a had in stock and it works great!

Step 4: The Arduino

Picture of The Arduino

the arduino nano control all the things,

to measure the temperature i used a module with a max 6675 connect directly to the thermocoupler of the handle,

the max6675 is connect by spi to the arduino and the supply library is very simple to use.

I put 2 push buttons to control the temperature and a lcd , the lcd is control by i2C it's overkill but i only had this in stock so i used it!

there is a led wich is lighting when the heater is on

to conclude the arduino is connect to my card build earlier.

Step 5: The Code:

My code is the simplest possible:

first: i don't implement for the moment the reed use when you put-on the station the gun is always on!

then we read the temperature if it is lower than the consigne the heater is put on , and stop when it reach the goal !

with the two button you adjust the temperature.

that's all.

Off course it's not perfect but i thought it would be a good starting point for all the beginner in electronic.

Step 6: The Final

Picture of The Final

what's next?

in the future i would like to add the reed switch support , ( i've ordered in china the handle support) and most important the pid for the temperature management,

if you'd like to implement fonctions please be free and contact me , i will be very happy to test it!


Jean-FrançoisR9 (author)2018-01-12


Des pb liés je pense à la bibliothèque LiquidCrystal I2C la ligne 45 est rejetée...

Jean-FrançoisR9 (author)2018-01-05


des soucis avec la librairie Arduino LiquidCrystalI2C et MAX6675, une aide si c'est possible, il ne me reste plus que la prog du Nano à faire.


j666gak (author)2017-12-29

Hello. I really like the project, thank you.

I want to build, but I think I would like to see the reed switch and PID support; have you managed to try this yet?

Thanks, well done

AhmedE41 (author)2017-10-21

hello sir my max6675 read very strange value like 300 , 600 & 700 while heater on and only read correct if heater is off

edusertorio (author)2017-09-02

ERRATA: HOT GUN ~US$18.00 => ~ R$60 (BRL)

edusertorio (author)2017-09-02
ajayt7 (author)2017-08-31

Pretty good, neat instructable

wlcd (author)2017-08-16

Real nice project ! Some links to the place you ordered everything might be usefull, but anyways, I will probably build my own :)

dinconnu (author)wlcd2017-08-17

I will post links after my holidays no worry

AhmedE41 (author)2017-08-16

thank for share is that hot air have air pump inside ?

dinconnu (author)AhmedE412017-08-17

Yes there is a fan inside the handle

Swansong (author)2017-08-11

Thanks for sharing :)

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