Place the SIM800L library folder into your \Documents\Arduino ... reset pin of your board you can reset GSM by external reset pin of the SIM800l GSMTime(time) true or false Will fill up the array you ...

ATmega328p micro-controller as per schematic or alternatively a Arduino uno/nano module. Resistors: 20 ohms , 220 ohms, 660 ohms, 10K , 500ohms X 7, 1K X 4 Transistors 4 X 2N2222 NPN One 4 digit seven ...