Hello everyone, I am learning and have made some progress. I am using an Uno and a level sensor to sense whether the tank has reached a low point to reorder some more. That works as I can output it to the serial monitor and see the input 1 to 0, and based on that serial print a messgae. I have also figured how to integrate a DS1307 RTC module and configure for update on Friday to check unless it falls out of range and then immediate response out.
I have purchased one of the SIM800L cards, can't figure out what sim it works with. I purchased a MKR GSM 1400 with sim card from arduino store, its 3g, no longer available in my area. I have purchased a MKR NB 1500 and used an ATT IoT sim card that is 4g and it had firmware issues, but have been able to get it updated. I can use the u-blx m-center software and it sees the LTE signal, sim card is ready, AT commands are working. but can't get it to do anything to see on the receiving end. Even using the SMS test function in the ublox m-center doesn't show up.
Frustrated, I have ordered another 4g modem board SIM7600 that will be here today.
I am working on getting my drawing done of the wiring schematic. The sketch I normally pull snippets from examples and combine and tweak till I get the required results.
I think the sensor and data I can figure out, the SMS message is kicking my tail.
Thanks for any insight
Steve