(2017-10-14, 10:19 AM)affinite Wrote: Thanks for all suggestions and comments so far
Real-Time monitoring and MQTT would be nice, and I am a fan of Node-Red but internet connection is an issue as I dont have reliable WiFi in the boatyard. In essence, its a battery low voltage alert that I need so maybe an OP driven SMS from a GSM Dongle would be better for me.
Its interesting exploring the options though.
Steve
So if you dont like my node red solution and want to save your power get an arduino pro mini + GSM module + something to measure the voltage like the ina219. Put it to deepsleep and wake it every hour to get the voltage. If its below a certain value let it send a message to you in form of a SMS, mail, what ever.
Google the key words there are many youtube videos regarding this topics. You can get the job done in less than 2h.