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Sending one data bit in a time. Used mostly in RS232 context.

-1 votes
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399 views

Can't Interface SIM900a With Arduino Uno

I've got the following module of SIM900a. My connections are: VCC -> External 5 Volt 1.5 Amp Supply GND -> Common GND TX -> Arduino RX (Pin 0) RX -> Arduino TX (Pin 1) I hear a ring when I call …