My setup is as on png above, I am using sim800L gsm module, by trial and error i discovered that i can connect sim pins: (rst,gnd,io and clk) and the module detects and connect to GSM without connecting power to sim vcc pin, i also read that sim vcc is optional.
what i want to do is somehow switch clk signal so that one sim card is detected by module at a time, i can do it with manual switch but how can i do it with electrical switch?. pls help.
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