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Old 15th October 2012, 05:15 PM   #11
Corpius is offline Corpius  Netherlands
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I updated the list at the first post
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Old 15th October 2012, 10:08 PM   #12
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Built-in port expander? such as PCF8574 in case you need more ports for relays, etc. And/or a shift register to drive the LCD with this library: https://bitbucket.org/fmalpartida/ne...stal/wiki/Home. I feel the I2C option for the LCD is "too slow"
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Old 15th October 2012, 11:03 PM   #13
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Quote:
Originally Posted by glt View Post
Built-in port expander? such as PCF8574 in case you need more ports for relays, etc. And/or a shift register to drive the LCD with this library: https://bitbucket.org/fmalpartida/ne...stal/wiki/Home. I feel the I2C option for the LCD is "too slow"
How funny is that. I also forgot to add the PCF8574 to the list as well. It is already incorporated, but thanks!

I planned to use the I2C LCD extra IO in combination with the library you mentioned. I am currently using it with my Arduino as well. It doesn't feel slow to me. According to the webpage you where referring to, the library should be almost 5 times faster than the original LCD library.

I have been busy with the design today. It is not final, but this is what I have for so far. The PCF8574 needs to be positioned to a better location and all connections to it are also still not drawn.
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Old 16th October 2012, 01:59 AM   #14
glt is offline glt  United States
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LCD benchmark:

LiquidCrystal 4BIT ShiftRegister ShiftRegister SR3W I2C
1 3.72 4.28 3.13 0.34

I2C is 3X slower than LiquidCrystal which is the built-in library.

Should the I2C headers also be at the edge of the board?
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Last edited by glt; 16th October 2012 at 02:02 AM.
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Old 16th October 2012, 07:10 AM   #15
Corpius is offline Corpius  Netherlands
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So using i2c for the LCD might be slower, but from what I am experiencing it is fast enough. I can`t notice any difference.

There will be some I2C outbreaks left from the DS1307 - real time clock. I will probably add I2C isolators to those as well. There will also be a row of digital I/O`s and some sensor inputs. These will all be added somwhere next to the MCP42010..
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Old 16th October 2012, 11:51 AM   #16
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Corpius do you make a GB?
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Old 16th October 2012, 11:59 AM   #17
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Quote:
Originally Posted by merlin el mago View Post
Corpius do you make a GB?
What do you exactly mean with "GB"?
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Old 16th October 2012, 12:00 PM   #18
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Group Buy
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Old 16th October 2012, 12:15 PM   #19
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If there is enough interrest I might do so or sell it through my website. First priority is to finish the design and make a prototype.

I could do with some input for the design. I'm thinking of adding some function to put the entire DAC into standby, except for the control unit. When it's in standby it could show the day time, month and year with the backlight turned off. This could be achieved with a little add-on board that houses a logic controlled relais that switches the power to the transformers.
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Old 16th October 2012, 12:33 PM   #20
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Count in me for 1 pcb, each time sounds more intersting.
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