Actions

Difference between revisions of "Kiln temperature controller"

From Just in Time

 
(6 intermediate revisions by the same user not shown)
Line 5: Line 5:
  
 
==Project notes==
 
==Project notes==
* [[Media:max6675.pdf|maxx6675 thermocouple-to-digital converter]] datasheet
+
* [[Media:max6675.pdf|max6675 thermocouple-to-digital converter]] datasheet
 +
 
 
==Project Status==
 
==Project Status==
 
;2010-06-23: Switched to AVR (from SX). Hardware platform now ready (max6675, LCD, LCD backlight control, rotary encoder, 2 switches, relay + driver, transmitter, receiver, led and programming header). First test with 'hardcoded' oven program successful. module tests of max6676, rotary encoder, LCD and relay successfully completed. Total hardware cost: around €33,-, including K-type thermocouple probe.
 
;2010-06-23: Switched to AVR (from SX). Hardware platform now ready (max6675, LCD, LCD backlight control, rotary encoder, 2 switches, relay + driver, transmitter, receiver, led and programming header). First test with 'hardcoded' oven program successful. module tests of max6676, rotary encoder, LCD and relay successfully completed. Total hardware cost: around €33,-, including K-type thermocouple probe.
  
[[Image:Oven_controller_top.jpg|500px|left]]
+
[[Image:Oven_controller_top.jpg|500px]] [[Image:Oven controller pcb.jpg|500px]]
 +
 
 +
==Comments? Questions?==
 +
{{ShowComments|show=True}}
  
==Project Files==
 
[[Image:oven controller pcb.png| 300px|left]]
 
The eagle schematic and board are in [[Media:oven controller schematic.zip|this file]]. An AVR eclipse project for the firmware is [[Media:oven controller.zip|here]].
 
 
[[Category:AVR]]
 
[[Category:AVR]]

Latest revision as of 15:36, 28 March 2015

General description

This circuit is intended to control a pottery oven. It uses the MAX6675 thermocouple-to-digital converter to measure oven temperatures. An oven schedule will consist of a list of (s, d)-tuples, where s stands for time in seconds and d for temperature in degrees Celcius. When started, the AVR should work through the list of tuples and for each tuple move to desired temperature d taking s seconds to get there.

The circuit uses an LCD display, a rotary encoder and two buttons for its user interface. The oven is controlled through a relay. Since the oven will be in a shed and the users would like to monitor the ovens progress from home, the controller will send its status periodically through a (cheap) 433Mhz transmitter. The See the Wireless LCD display project (which is finished).

Project notes

Project Status

2010-06-23
Switched to AVR (from SX). Hardware platform now ready (max6675, LCD, LCD backlight control, rotary encoder, 2 switches, relay + driver, transmitter, receiver, led and programming header). First test with 'hardcoded' oven program successful. module tests of max6676, rotary encoder, LCD and relay successfully completed. Total hardware cost: around €33,-, including K-type thermocouple probe.

Oven controller top.jpg Oven controller pcb.jpg

Comments? Questions?

nopreview

{{#set: |Article has average rating={{#averagerating:}} }} {{#showcommentform:}}

{{#ask: Belongs to article::Kiln temperature controllerModification date::+

 | ?Has comment person
 | ?Has comment date
 | ?Has comment text
 | ?Has comment rating
 | ?Belongs to comment
 | ?Comment was deleted#true,false
 | ?Has comment editor
 | ?Modification date
 | ?Has attached article
 | format=template
 | template=CommentResult
 | sort=Has comment date
 | order=asc
 | link=none
 | limit=100

}}