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1. I want to buy the specific SIM900A module. Benefit is it had additional TTL output because of which I can directly connect rx,tx & GND from my 3.3V microcontroller & can commincate.
1. Just standard 3 pins from MCU & I am done. rx, Tx & Gnd
2. Board dimesnions are 90mm x 60mm.
3. Image of top & bottom are below:
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