I finally got a chance to try the tutorial, and it worked right away! Thanks Omega303!

Anders,

I don't have an onion relay expansion yet, but you could probably use it in place of this circuit I made to switch a Solid State Relay.
https://www.sparkfun.com/products/10636
I use this to switch Solid State Relays that drive 5500W heaters for my brewery.
You only need half of this to drive one relay. It will take 3-5VDC and step it up to 12VDC to switch the SSRs. I currently control this with an arduino, but plan to replace that with an onion soon.

https://www.circuitlab.com/circuit/5v274c/dual-ssr-arduino-switch/

You need a Ground Fault protected breaker(GFCI) on the AC circuit! Don't attempt this is unless you know how to safely work with dangerous voltage! I can not be responsible for your safety! Make this at your own risk!

@Martin-Oberg

Looks good, Thanks for sharing! I tested out your code on one of my original Omega, and was also having issues with running out of space. When I have some time I'll try again with my Omega2+ and add more space with an SD card.

I've been too busy with work to get anywhere with my own project, but am looking for the best way to add server-side functionality to this project. It would be great to be able to change the setpoint, show last off time, and set minimum off time. Any suggestions on the best way to do this? I'm trying to learn more about PHP, and also looking at node.js.

Once I have an Omega controlling my draft cooler, my goal is to replace the arduino controlling my brewery now. Hopefully I will be far enough along with that project to have something worth sharing in a couple more weeks.

@Lazar-Demin Thanks for the update. Any idea on Ubidots integration? >2months? Just curious, thanks for all that you have released lately!

Any update on when to expect Ubidots integration?
Thanks!

@Jeff-Verive Agreed. Let us know how it goes!
I hope to switch over to an Onion controlled system for my brewery as soon as I get some spare time to work on it.

@Jeff-Verive For my big relays I use Solid State Relays, opto-isloated, no coils. Mine are rated for 50a @240VAC. You should get relays rated for at least double the current you need.
Here are the input ratings on the relays I am using in my brewery to power 5500W water heater elements.
Control Voltage: 3-32V DC
Control Current: 5-25mA DC.
For input a basic old 12V DC 0.5a power supply is fine.

Although my arduino should be able to switch the big relays directly, I prefer to use the opto-isolated 12V circuit to switch them.

I needed to switch huge relays with my arduino. The circuit I posted is how I used a relay(TIP120 and transistor) to make a 3VDC output a 12VDC output. The two sides of the circuit are isolated. The big 240VAC relay is driven by the 12V side of the circuit.
Of course you only need half of the circuit to drive one relay.

Although I haven't tried it yet, Could the Onion relay expansion be used in the same way?
The output from the expansion drives the input of the larger relay. Add a power supply of 12VDC, or whatever your big relay needs for input.
Also, add a kill switch, fuse, and GF protected outlet for AC, for safety's sake.

I finally got a chance to try the tutorial, and it worked right away! Thanks Omega303!

Anyone have any luck with 1-wire interface yet?
I use DS18B20 sensors with arduino. I need sensors rated for up to 100C for my brewery project, so DHT11 or DHT22 are not an option. I would like to eventually run everything from the onion without an arduino dock.

Anders,

I don't have an onion relay expansion yet, but you could probably use it in place of this circuit I made to switch a Solid State Relay.
https://www.sparkfun.com/products/10636
I use this to switch Solid State Relays that drive 5500W heaters for my brewery.
You only need half of this to drive one relay. It will take 3-5VDC and step it up to 12VDC to switch the SSRs. I currently control this with an arduino, but plan to replace that with an onion soon.

https://www.circuitlab.com/circuit/5v274c/dual-ssr-arduino-switch/

You need a Ground Fault protected breaker(GFCI) on the AC circuit! Don't attempt this is unless you know how to safely work with dangerous voltage! I can not be responsible for your safety! Make this at your own risk!