ขาย SIM900 (SIM900A) Mini DEV Board GSM/GPRS Module ราคาที่ดีที่สุด

SIM900 (SIM900A) Mini DEV Board GSM/GPRS Module Features: - Power supply by 5V, can be powered by USB, for long term use it is better to still use 1A current power source. XH2.54-2P connector. - TTL 5V and 3V3 interface (yellow pins marked on board), compatible with arduino, STM32, raspberry pi, etc. - On board RS232 interface, easy for debugging. On the left, white pins. - On board ring signal LED, on the left-top corner of SIM900A IC. - On Board reset and restart pins, on the bottom of the SIM900A IC. - Reserved IPX mini connector, but not yet soldered. - Standard SMA antenna connector. - Serial port is protected by TVS and beads circuit, to prevent any surging current or HV. - SIM circuit has SMF05C electrostatics releasing IC. - Package includes antenna and DC jack. - Do NOT have audio power jack on board, which means you can not hearing or speaking through the call. - Board size is 55 CM - The attached images show how the use the USB-TTL programmer and RS232 to connect it.