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I am trying to connect my Raspberry Pi to a sim card that I bought so that is can send an SMS and access the internet, but I am struggling to connect the sim module to my Pi. I have attached a GPIO pin layout as well as how I think I should connect it, but I am very new to microelectronics and am nervous that I damage the circuitry. The number in the brackets is which pin I think it shold connect to. This is where I got the module from however all their documentation is for Adrinos. (https://www.robotics.org.za/113990111?search=Mini%20GSM%2FGPRS%20Breakout%20800L)

Thanks for the help! enter image description here

Calvin Durr
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  • You might like to search "SIM800" in this forum to learn how other newbies are settinp up things for Rpi3B+. Or you can read my answers to the following questions for Rpi4B SIM7600 configuration. (1) https://raspberrypi.stackexchange.com/questions/113992/using-3-sim800c-gsm-hat-on-1-raspberry-pi-3b, (2) https://raspberrypi.stackexchange.com/questions/103785/sim7600-4g-hat-rpi3b-setup-problem For newbies, I would recommend to use USB to UART adapter to talk to SIM/8/900/7600. Good luck and cheers.. – tlfong01 Jul 30 '20 at 11:55
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    To draw the power to the SIM800 from the Raspberry Pi is a BAD IDEA! The current peaks a SIM800 can have is exceeding the capability of the power a Raspberry Pi can spare for external devices. – MatsK Jul 30 '20 at 12:12
  • Ah yes, I very much agree. That is why I almost never use HAT. As you can see from my SIM7600 HAT setup, I don't use it as a HAT. I don't even use Rpi's on board UART, I only use USB to UART adpater. To repeat, I almost never use Tpi's on board 40 pin connector 3V3/5V0 power rail. – tlfong01 Jul 31 '20 at 01:59
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    Thanks so much for the help! I am going to look for one of those adapters. – Calvin Durr Jul 31 '20 at 12:15
  • You are welcome. Have a nice SIM800 project. Cheers. – tlfong01 Aug 01 '20 at 00:38

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