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Homeroasters.org » DATALOGGERS - CONTROLLERS - RATE OF RISE METERS » Dataloggers/Controllers/Rate of Rise Meters
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Update to my TC4 control box
greencardigan
I've stripped down my old TC4 controller and built it all onto a new box with a few enhancements.

In preparation for my current roaster build, I wanted another SSR to switch extra elements. I have the OT1 output triggering two SSR, one on each of the power circuits I'll use.

Also, I've swapped the LCDapter with a cheap LCD which also connects using I2C. I've made changes to aArtisan_PID sketch to support these LCDs and hope to release that soon once I do a bit more testing.

I have retained the zero cross detector for phase angle control of my blower and also kept the bluetooth module for wireless logging and control.
greencardigan attached the following images:
screenshot_20180211-231810_01.jpg screenshot_20180211-231030_01.jpg screenshot_20180211-231346_01.jpg screenshot_20180211-230851_01.jpg screenshot_20180211-230858_01.jpg

Edited by greencardigan on 02-11-2018 01:18
 
JackH
Looking good Brad.

The LcdApter had an odd channel for I2C, I think Ch5.
It was not easy to adapt other I2C boards without software changes.
---Jack

KKTO Roaster.
 
greencardigan
It's a big box but was much easier to lay out all the parts and cables. My old box was a mess.

It was quite easy to get the cheap I2C LCD working once I worked out which library it needed. And thanks to BenKeith for sending me the LCD to test.
 
Will2
Nice work Brad,
it will be difficult for you keep alive parallel aArtisanQ_PID in both versions of I2C_LCD for MCP23017 too for PCF8574?
I2C address is 0x3F or 0x27? Is it possible to use PCF8574 as a port expander?

Beware of the thermocouple connectors, the MCP9800 for cold junction measurement will have a different temperature than the cold junctions - a big measurement error! Try it with a hot-air gun. That's why I left my box open.
Viliam
 
greencardigan
It should be possible to add support for PCF8574 port expander. I currently have the buttons connected directly to the Arduino digital inputs as there were some not being used.

The I2C Address for LCD I am using is 0x3F, but I added a compile directive in user.h so it can be changed.

Are you referring to the MCP9000 sensor being inside the box and the cold junction is outside the box at the connectors? I may add some ventilation to the box as this will also help keep the SSR cooler. Just need to keep chaff out.
 
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