I am working on a project of designing a system for leak detection in pipelines. I want to monitor pressure/flow in both endings of a 5km long pipe and acoustic emissions onto some crucial points of the pipe.
For that reason I am intending to prototype some data-loggers. These will be consist from a ADC, a micro-controller and a SD card.
The real problem now, is the synchronous monitoring of many signals along 5km range. I want to trigger the data-loggers exactly at the same time, in order to keep synchronized different measurements from different locations.
My question is: what is the most appropriate method to achieve this?
- use a cellphone and two GSM modules to trigger the data-loggers at the same time?
- use some LoRa modules to transmit the measured data into a PC/laptop? (obviously the SD card is no needed any more).
- use two cellphones to transmit data via internet?
- anything else?
Thank you in advance.