Where to buy specific Sim900A module chandigarh/Delhi | Electronics › Electronics › Where to buy specific Sim900A module chandigarh/Delhi This topic has 0 replies, 1 voice, and was last updated 10 years, 3 months ago by Deepak Bansal. Viewing 1 post (of 1 total) Author Posts August 9, 2014 at 6:19 am #4893 Deepak BansalParticipant 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: Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In