First project I am attempting so please be kind I am attaching a very basic schematic showing what I would like to do.
Basically, when my house alarm goes off there is a terminal which goes to 0V. Using this an a permanent 12V terminal I could use the alarm state to activate a 12V relay. Maybe something like this?
Then the output terminal of the relay could be used as an input to a terminal of a wemos d1 mini or equivalent device like this maybe? Which then sends me a notification on my phone. Finally I could use IFTTT to switch on my external sonos controlled security lights.
Iām wondering if there is a combined relay/wemos type device, but as you can see the logic is backwards to the normal āwemos controls relay which controls a power circuitā. I am going with āalarm controls relay which signals wemos to notify me of alarmā.
Iām in the UK so looking at Amazon firstly for any parts, so I can tinker with it over Xmas break.
Would appreciate any advice on hardware/other solutions.
What you are proposing with a relay is fine and gives you some isolation from the alarm , which is a bonus.
Use the relay contact with a pull up resistor as a digital input . Detect that in your code to initiate your call.
If this is is your first project , Iād buy a genuine Arduino ( there are cheaper alternatives , but as a as a starter its s a good move ) and get that working with your alarm( turn on a led for example) , then look at getting suitable shield for sending a txt or whatever you decide to do .
Youāll need a few bits to try this , such as a breadboard, few bits of wire, led, few resistors ( 10k and 270R).
Look at the digital input /output examples in the IDE
hammy:
What you are proposing with a relay is fine and gives you some isolation from the alarm , which is a bonus.
Use the relay contact with a pull up resistor as a digital input . Detect that in your code to initiate your call.
If this is is your first project , Iād buy a genuine Arduino ( there are cheaper alternatives , but as a as a starter its s a good move ) and get that working with your alarm( turn on a led for example) , then look at getting suitable shield for sending a txt or whatever you decide to do .
Youāll need a few bits to try this , such as a breadboard, few bits of wire, led, few resistors ( 10k and 270R).
Look at the digital input /output examples in the IDE
Glad I am heading in the right direction at least. Pull up resistor connected something like the attached diagram? Iām wondering what the normal Vcc supply if fed from.
I was looking at the Wemo D1 mini which has wifi built in, so no need for a shield then?
I will have a look for the examples you mentioned. Lots to learn but I like a challenge!
I am attaching a very basic schematic showing what I would like to do.
