Chongqing switchgear wireless temperature measurement

Energy conservation is to reduce costs and serious issue economic progress, pay attention to the safety of electricity, avoid fire is the time we need to pay attention questions. According to some social phenomena cause a fire, a plan based on SCM's saving power protection circuit. Energy for mankind has brought economic benefits, environmental protection and convenient, but it should save electricity, pay attention to safety and to avoid fires. Energy conservation is to reduce costs and serious issue economic progress, pay attention to the safety of electricity, avoid fire is the time we need to pay attention questions. According to some social phenomena cause a fire, a plan based on SCM's saving power protection circuit. 1, the hardware configuration planning hardware circuit shown in Figure 1. S1 manual power switch; S2 pressed close, let go off; press S2, SCM launched the operation, after 2s mercy, KM closed, communication can continue to supply power to 220V electrical equipment, power supply after 5min, the microcontroller according to the information detection sensor control of the power supply; when the sensor detects a road information so P1.1 is high, P1.0 output 5V to U4 3 feet high, 2 feet and U4 is only 1.5V, so the pin output U4 high to VT1 conduction, VT2 conduction, the 12V DC power supply for relay coil power JZC-36F, KM closed, the communication 220V normal power supply for electrical equipment. When the sensor detects information enables P1.1 is low, the delay after 1min, the detection P1.1 again, if successive 5minP1.1 low, the P1.0 output low to U4 of 3 feet, U4 pin output low level to the base of VT1, VT1 off, VT2 off, relay JZC-36F coil power, KM disconnect 220V power supply cut off communication. VD3, VD4 and then to complete the line or barrier diode, VD2 to maintain diode, VD1 is to raise the emitter potential of VT1, VT2 is necessary to choose the larger power transistors, such as JE9051 silicon power transistor. For reliable operation of the relay, the circuit planned two + 5V and + 12V power supply, type or parameter components shown in Table 1. 2, the sensor signal handling circuit sensor signal handling circuit shown in Figure 2. Human infrared sensor for detecting a specific wavelength of infrared body announced, to detect non-touch distance, the operation voltage of 3 ~ 15V; when the body enters the sensing area of ??the sensor, the sensor receives a frequency of 0.1 ~ 8Hz body infrared signal, 2 feet weak communication signal is output. The output signal of the sensor 2 after a two-stage expansion of the foot, 1 foot from the output signal fluctuations U6 is 0.5 ~ 5V, the DC component is 3V. U7, D5, D6, R14, R15, R16, R17, form a dual-gate voltage contrast device, if no signal U6 output of 1 foot, 2 feet for the U7 3.3V, U7 3 feet of 2.7V, U7 1 pin output low; when the pin output U6 is greater than 4V or less than 2V, 1 foot high level output U7 to the CPU. 3, the software design process flow chart shown in Figure 3. When the demand for open electrical equipment, press S2 for two seconds or so, launch the microcontroller so P1.0 is high, KM closure to continue to supply electrical equipment; make P1.1 is high, set P1.1 as input status. 5min after the start of detection P1.1, if P1.1 is high, so P1.0 is high, R0 assignment 05H, come back again detected P1.1; if P1.1 is low, the delay 1min, If R0 minus 1 is not 0, and come back again detected P1.1, if R0 is decremented by 1 to 0, so P1.0 goes low, cutting off electrical power to the equipment