Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
You must login to post a message.

10/22/2019 5:31 AM
Thanks to you all....... I was not sleeping ... I stayed awake worried about it all. :)

Koffee Kosmo
10/21/2019 5:00 PM
While you were sleeping I have been active in booting out some spammers along with the posts they tried to sneak past me

10/21/2019 2:41 PM
Apologies, fixed it asap! BBQ grill

10/21/2019 12:35 PM
WOW!! A few minutes ago the site page said "Account Suspended". And would not open the site.

10/18/2019 2:37 PM
Eth Nat Yirg Idido roasted yesterday. I dropped some off at a friends coffee shop. In a few days he will brew it and tell me what he thinks. We believe my roasts are better than what we buy.

Users Online
Guests Online: 2

Members Online: 0

Total Members: 6,202
Newest Member: Brad1969
In Memory Of Ginny

Latest Donations
renatoa - 2.00
allenb - 25.00
snwcmpr - 10.00
Groveland Hill Roas... - 25.00
renatoa - 2.00

View Thread

Who is here? 1 guest(s)
 Print Thread
Control Heat Gun via PWM
Hi all,
I'm currently roasting in a behmor and about to put together a bread maker/heat gun combination for something different and possibly to be able to do larger batches.
I've assembled an Arduino TC4 and had a play with Artisan and RoastLogger software.
I am thinking about controlling the heat gun's output via PWM from the TC4.
Does anyone have any experience driving a heat gun via PWM signal?
Is it best to split the fan/element circuit and vary the element only?
Howdy fg and welcome to HRO. I see you reside in the land where the Corretto was born.

If by PWM you're referring to the on-off proportional duty cycle many of us use to control an SSR from OT1 pin then it will work fine for driving an SSR connected to the heating element of your heat gun. I wouldn't use the higher frequency pwm used for driving fans for this purpose. You can set the heater output (OT1) to a 1 second time base which provides a very smooth output from the heater without sagging during on/off pulses.

Yes, do separate the fan from the heating element but be aware that many heat gun designs use some of the heating coils as a dropping resistor to derive a lower voltage that then feeds a bridge rectifier for providing DC to the fan motor which can complicate the separation procedure.

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
Thank you Allen,
I'll have a bit of a play with the TC4's outputs by configuring it to drive an LED as a test.
As for separating the heat gun's element and fan, would I be correct to presume the fan should be configured to be on constantly and only the vary element's output?

Yes, the fan should remain on and vary the power to the heating element.
I'm assuming your heat gun has a dc fan motor as you would find in a blow dryer? If yes, then its important to measure the voltage going to the motor (before the rectifier) prior to pulling everything apart so you can run the fan at the same speed after separating them. Obviously you'll need a means of providing the lower ac voltage to the rectifier input.

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
Thanks again Allen.
Jump to Forum:

Similar Threads

Thread Forum Replies Last Post
Loft power & heat Fluidbed Roaster 9 08/05/2019 2:04 PM
Preferred Control Method Fluid Bed Roaster Fluidbed Roaster 7 07/31/2019 11:06 AM
Update to my TC4 control box Dataloggers/Controllers/Rate of Rise Meters 16 06/02/2019 4:04 PM
Heat Gun Driven Fluid Bed Roaster Fluidbed Roaster 26 03/07/2019 2:24 AM
Blower > Heat > Min distance??? Fluidbed Roaster 6 03/06/2019 8:46 AM
Homeroasters Association Logo, and all Content, Images, and Icons © 2005-2016 Homeroasters Association - Logos are the property of their respective owners.
Powered by PHP-Fusion Copyright © 2019 PHP-Fusion Inc
Released as free software without warranties under GNU Affero GPL v3
Designed with by NetriX