Considering the low-power, small size, easy to use and so on. I design the base of RF-based nRF2401 and digital temperature sensor DS18B20 wireless temperature alarm system. The whole system composed by the transmitter and receiver. For the first, using temperature sensor DS18B20 to collect temperature signal. Second, the temperature signal is stored in the master chip and I use the adoption of radio frequency nRF2401 to send it to the host computer. Third, the host computer control LCD to dynamic display. Final, the host computer control lights and alarms to make a corresponding response. Constitute a new wireless communications, control functions system. The system was designed a simple human-computer exchanges, such as the keys and indicator lights. It is able to realize real-time alarm setting upper and lower limits of temperature, the effective transmission distance to reach 20-40 meters. Tests show that it has the portability and practicality, good performance

NRF2401无线温度计
.................\NRF2401_receive
.................\...............\main.c
.................\...............\main.LST
.................\...............\main.OBJ
.................\...............\receive
.................\...............\receive.hex
.................\...............\receive.lnp
.................\...............\receive.M51
.................\...............\receive.Opt
.................\...............\receive.plg
.................\...............\receive.Uv2
.................\...............\SPCE061A.h
.................\...............\STARTUP.A51
.................\...............\STARTUP.lst
.................\...............\STARTUP.OBJ
.................\NRF2401_send
.................\............\main.c
.................\............\main.LST
.................\............\main.OBJ
.................\............\send.hex
.................\............\send.M51
.................\............\send.Opt
.................\............\send.plg
.................\............\send.Uv2
.................\............\STARTUP.A51
.................\............\STARTUP.lst
.................\............\STARTUP.OBJ

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