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[ 7 posts ] |
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Carambola IO board with 8 relays and 8 inputs
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mckillnm
Joined: 04 Mar 2013, 15:43
Posts: 5
Location: Ireland
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Hi folks,
Just finished off the hardware for an IO board for the Carambola. It uses a MCP23017 I2C bus extender to drive 8 realys and also has 8 inputs too.
Part one: circuit design -
Part two: PCB production -
Enjoy.. Time to get writing some software for it now! Anyone done anything with MQTT and the Carambola? Thinking of a Lua implementation.
Regards,
Mark
Attachments:
File comment: The finished PCB loaded and working..
Carambola IO Board working.JPG [ 267.16 KiB | Viewed 9496 times ]
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| 04 Mar 2013, 15:53 |
 
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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Hi,
we are using Lua for our commercial projects.Works fine.
btw really nice project!
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| 04 Mar 2013, 16:58 |
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mckillnm
Joined: 04 Mar 2013, 15:43
Posts: 5
Location: Ireland
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Hi gedass,
Have you used MQTT at all?
-Mark
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| 04 Mar 2013, 17:00 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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Never.Only I used vscp protocol for my home automation projects.
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| 04 Mar 2013, 17:16 |
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bluespray
Joined: 26 May 2012, 01:19
Posts: 66
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What about the PCF8574? You can configure address on these and have up to 64 IO.
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| 04 Mar 2013, 22:43 |
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mckillnm
Joined: 04 Mar 2013, 15:43
Posts: 5
Location: Ireland
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The PCF8574 looks like a 8 port extender. The MCP23017 has 16 IO pins on it and the PCB has the I2C address lines in a place that you can change it if you need! The header on the PCB also allows you to connect other I2C bus devices too. So in theory you could use 8 MCP23017's giving 128 IO pins.
I'm using this board for home automation, for controlling a boiler and a few electric valves and a hot water heater. I'm planning to connect some DS18B20's to the Carambola too, you can see more here:
-Mark
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| 05 Mar 2013, 11:06 |
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mckillnm
Joined: 04 Mar 2013, 15:43
Posts: 5
Location: Ireland
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Hi folks,
Working on some MQTT Lua client software today...
You can read more on my blog..
Regards,
Mark
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| 06 Mar 2013, 21:07 |
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