# Problem with connect sim module to raspberry pi

**URL:** <https://discourse.nodered.org/t/problem-with-connect-sim-module-to-raspberry-pi/76554>\
**Category:** General\
**Created:** [14 March 2023 15:11 UTC](https://discourse.nodered.org/t/problem-with-connect-sim-module-to-raspberry-pi/76554 "2023-03-14T15:11:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![issambfs1](https://avatars.discourse-cdn.com/v4/letter/i/ea666f/32.png) [@issambfs1](https://discourse.nodered.org/u/issambfs1)\
**Post date:** [14 March 2023 15:11 UTC](https://discourse.nodered.org/t/problem-with-connect-sim-module-to-raspberry-pi/76554/1 "2023-03-14T15:11:06Z")

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i had try to connect module sim900a mini v3.8.2 to raspberry pi zero w v1.1

this is what i did \*\*\*\*\*\*\*\*

1. Start raspi-config: `sudo raspi-config`.
2. Select option 3 - Interface Options.
3. Select option P6 - Serial Port.
4. At the prompt `Would you like a login shell to be accessible over serial?` answer 'No'
5. At the prompt `Would you like the serial port hardware to be enabled?` answer 'Yes

and in /boot/config.txt \*\*\*\*\*\*\*\*\*\*\*

dtoverlay=pi3-disable-bt  
dtparam=spi=on  
dtparam=i2c\_arm=on  
#dtoverlay=w1-gpio  
enable\_uart=1  
core\_freq=250

and i set in /boot/cmdline.txt \*\*\*\*\*\*\*\*\*\*\*\*

console=tty1 root=PARTUUID=36517a7a-02 rootfstype=ext4 fsck.repair=yes rootwait modules-load=dwc2,g\_ether quiet splash plymouth.ignore-serial-consoles earlycon=pl011,mmio32,0x20201000 core\_freq=250

also try to set console=tty1 root=PARTUUID=36517a7a-02 rootfstype=ext4 fsck.repair=yes rootwait modules-load=dwc2,g\_ether quiet splash plymouth.ignore-serial-consoles

* * *

## so in node red i use serialport /dev/ttyS0 baud rate 9600 data bits 8 parity none stop bits 1

so is there any thing i did wrong ? please ?

note : i alredy test the sim900a with arduino and it work

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**Author:** ![mudwalker](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@mudwalker](https://discourse.nodered.org/u/mudwalker)\
**Post date:** [14 March 2023 17:56 UTC](https://discourse.nodered.org/t/problem-with-connect-sim-module-to-raspberry-pi/76554/2 "2023-03-14T17:56:31Z")

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This is doesn't appear to be a Node-RED related problem.

The hardware interface is between an RPi and the SIM900a GSMmodule, you might be better to look either in RPi forums, or somewhere that supports the SIM900a GPRS module. The first hit for SIM900 on Google came up with a link to the [Instructables site.](https://www.instructables.com/GSM-SIM900A-With-Arduino/)

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [13 May 2023 17:57 UTC](https://discourse.nodered.org/t/problem-with-connect-sim-module-to-raspberry-pi/76554/3 "2023-05-13T17:57:10Z")

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