Specification: Arduino 51 compatible STM32 AVR MCU Prototype expand The frequency is 850/900/1800/1900 MHz Power range: the voltage is 5-12V; the current is equal to or greater than 1A (the current is very important). Operating temperature range: -40 ° C to +85 ° C Communication interface: TTL level serial interface compatible 2.85 / 3.3 / 5V LED: two LEDs, the net and the ring. Size: 48 * 50mm SIMCARD: micro SIMCARD support Functionality: TTL level serial port compatible with 3.3V and 5V microcontrollers. When using computer debugging for the first time, it is recommended to use the CP2102 USB-TTL module for power and communication; Using the MCU control module, you can also use the USB-232 monitoring feedback data on the instructions, which is very handy for finding the problem, especially suitable for 51 MCUs. In standby mode in around 30MA, you can set the standby state to around 10 mA and in low consumption. Support SMS, GPRS data transmission, MMS, DTMF, HTTP, FTP, PPP dialing, etc. The hardware contains a channel reset pin. This reset pin can be used to solve a problem with the module. The development board supports Unicom cards or 2G / 3G / 4G mobile phones.
