Soumyajit
Junior Member level 3
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I turned it on, i sent some at commands:
+CPIN: NOT INSERTED
+CFUN: 1
AT
OK
AT+GMR
Revision:1137B08SIM900A32_ST
OK
but after it sim900 turned off and I can not turn it on! I heard that this happened for some guys! and they could not turn it on!
anyone know why? how can I use it again?
PS: the power supply is 12V 2A, using LM7805 and 1N4007 to make 4.2V...
>>>> PS: the power supply is 12V 2A, using LM7805 and 1N4007 to make 4.2V...
A very bad decision !!!
See as example synchronous step-down regulator
https://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00169322.pdf
NO USE LDO !!!!
Hi techie
The Sim FTP site is up again now, so here are two documents which may help you transfer to the sim900
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