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A small Arduino library for GPRS modules, that just works
Currently only SIM800/SIM900 are tested.
More modules may be supported later.
Getting started
- Using your phone: - Disable PIN code on the SIM card - Check your ballance - Check that APN,User,Pass are correct and you have internet
- Ensure the SIM card is correctly inserted into the module
- Provide a good, stable power supply (up to 2A, 4.0-4.2V or 5V according to your module documentation)
- Provide good, stable serial connection (Hardware Serial is recommended)
- Check if GSM antenna is attached
Troubleshooting
Sometimes (especially if you played with AT comands), your module configuration may become invalid. In this case, there may be different problems:
- Can't connect to the GPRS network
- Can't connect to the server
- Sent/recieved data contains invalid bytes
- etc.
To return module to Factory Defaults, use this sketch:
File -> Examples -> TynyGSM -> tools -> FactoryReset
License
This project is released under The GNU Lesser General Public License (LGPL-3.0)