ماژول

description:
This wireless transceiver module is an easy and suitable module if you want to setup your wireless communication system with low cost!! It can achieve a good balance between wireless transition performance and cost! You can easily add it with your own MCU/ARM/PIC/AVR/STM32 system! What\'s more, this NRF24L01+ module is designed with Power amplifier and SMA antenna. This allowed you to use the wireless communication up to 1000 meters! (No barrier)
Frequence: 2.4GHz~2.5GHz
Operating voltage: 3 ~ 3.6V Max
Current: 115mA
Multi-frequency: 125 frequency
Support up to six channels of data reception
Communication distance: up to 1000 meters (No barrier)

(Antennas WiFi Rail-Trackside, Directional 5 GHz, 23 dBi, Spot-L, IP 67, linear vertical polarized; SISO, Connector N (f

SIM868 module is a complete Quad-Band GSM/GPRS module which combines GNSS technology for satellite navigation 32M

SIM868 module is a complete Quad-Band GSM/GPRS module which combines GNSS technology for satellite navigation 24M

Description
The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3231 is available in commercial and industrial temperature ranges, and is offered in a 16-pin, 300-mil SO package.
The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an active-low AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I²C bidirectional bus.
A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a µP reset.

Features
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Battery Backup Input for Continuous Timekeeping
Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
Low-Power Consumption
Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
Two Time-of-Day Alarms
Programmable Square-Wave Output
Fast (400kHz) I²C Interface
3.3V Operation
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
Active-Low RST Output/Pushbutton Reset Debounce Input