Alarm and Solar Display with TTGO

IOT (The internet of things)
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I have my own security setup that is controlled via Node Red.
One thing that I have toyed with was to have a small display at my bedside table that will display the Zone that was triggered. I have the phone that shows all the triggers but I wanted something that I can see at a glance.
I could have done this with a Wemos and a small OLED but the TTGO board comes with two buttons and a much nicer OLED all integrated and at R 180 for the kit I could not resist.

The program was fairly simple - Have the unit screen off all the time and listen for a MQTT topic. if the correct one arrives (Alarm Trigger) switch on the screen display the Payload and after 60 sec turn off.

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But then what would a display be if it can not show your solar data…

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So , for the moment , I have a screen that shows some basic solar info and if a Zone gets triggered it will display the Zone and disable the solar data until I reset.
I also have the option that have the screen permanent on or on timeout. I still want to add a small buzzer to the circuit but need to look at the power draw so that it could wake me up at night if triggered.

@JacoDeJongh this is where the 3d Printer adds to the fun and a small case was born

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Final project assembled

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Alarm triggered
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Can Also rotate the screen if need be
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All and all a fun little board and If you are willing to spend more time with it there will an lot more you can do.

2 Likes
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Very cool! Where did you buy the board?

I’ve been toying with a small display for some things too – including the Battery SOC and other inverter goodies, or temperature.

Is there any real problem running it permanently on? It doesn’t look too bright for night-time use…?

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Not at all , you can even set the brightness. I just placed a timeout as it next to my bed and didn’t want it to be on while asleep.
Got mine from Bang Good but they are also Available in Sa.

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Software? ESPHome?

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My own blend. I wrote a small sketch as it only need to display the payloads received from mqtt. I did make it a bit “fancier” by adding a live update page and a wifi connect when you restart the unit 2x in a row. Most of that comes from libraries.