Difference between revisions of "Kiln temperature controller"
From Just in Time
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==General description== | ==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 ( | + | 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. |
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| − | The circuit uses an LCD display, a rotary encoder | + | 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 notes== | ||
* [[Media:max6675.pdf|maxx6675 thermocouple-to-digital converter]] datasheet | * [[Media:max6675.pdf|maxx6675 thermocouple-to-digital converter]] datasheet | ||
| + | ==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. | ||
[[Image:layout_oven_controller.jpg|400px]] | [[Image:layout_oven_controller.jpg|400px]] | ||
| + | [[Image:oven_controller_top.JPG]] | ||
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| + | [[Category:AVR]] | ||
Revision as of 23:45, 23 June 2010
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.
