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| Carambola IO board with 8 relays and 8 inputs https://www.8devices.com/community/viewtopic.php?f=8&t=367 |
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| Author: | mckillnm [ 04 Mar 2013, 15:53 ] | ||
| Post subject: | Carambola IO board with 8 relays and 8 inputs | ||
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
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| Author: | gedass [ 04 Mar 2013, 16:58 ] |
| Post subject: | Re: Carambola IO board with 8 relays and 8 inputs |
Hi, we are using Lua for our commercial projects.Works fine. btw really nice project! |
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| Author: | mckillnm [ 04 Mar 2013, 17:00 ] |
| Post subject: | Re: Carambola IO board with 8 relays and 8 inputs |
Hi gedass, Have you used MQTT at all? -Mark |
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| Author: | gedass [ 04 Mar 2013, 17:16 ] |
| Post subject: | Re: Carambola IO board with 8 relays and 8 inputs |
Never.Only I used vscp protocol for my home automation projects. |
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| Author: | bluespray [ 04 Mar 2013, 22:43 ] |
| Post subject: | Re: Carambola IO board with 8 relays and 8 inputs |
What about the PCF8574? You can configure address on these and have up to 64 IO. |
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| Author: | mckillnm [ 05 Mar 2013, 11:06 ] |
| Post subject: | Re: Carambola IO board with 8 relays and 8 inputs |
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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| Author: | mckillnm [ 06 Mar 2013, 21:07 ] |
| Post subject: | MQTT Lua client software |
Hi folks, Working on some MQTT Lua client software today... You can read more on my blog.. Regards, Mark |
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