Microwave radar detection automatic light circuit (2)

The white light circuit made using the RD9-181 microduration radar detection
module, as long as someone enters its effective range, the light will light up. After the person leaves, the light will go out after a set time delay: In addition, it also
has a light Control circuit, the circuit is closed for small work during the day, and the circuit automatically enters the monitoring state at night.
    In Youzhong, transformer T, diodes VD2 - VD5, three-terminal voltage stabilizing integrated block A2, etc. form a power circuit.
After power is supplied, a stable DC voltage of 12V can be output for module Al (RD9481) and relay K. R. 1
and RI form a light control circuit. During the day, RI has low resistance. It divides the voltage with R, so that the trigger control terminal of Al and the
level V of pin ⑤ are less than the module startup threshold VE (VE=0.2V). Therefore, it is prohibited to operate RD9481 during the day. Night
, RJ. Shows high resistance, ⑤ pin level VL is greater than the shoulder movement threshold VE, and the circuit enters the working state. At this time, as long as
someone enters the detection range of the antenna, the module A1 output pin ⑩ will output a high level through R. Make VT conduct,
relay K pulls in, its moving contact kl closes, and the lamp E lights up.
    宮, f: It is the external output delay element of the circuit, and the output delay time TA=5R. , that is, the circuit is triggered and
the module pin ⑩ outputs a high level for the duration. S is the working mode selection switch. When S turns +F,
any change in input signal will be invalid within the delay time T - until 1. time's up. When s is closed, it is a re-triggerable
working mode, which keeps pin ⑩ at the island level until the last trigger delay has elapsed. Specific visual reading
: You need to choose. This circuit also has a blocking timing component R, (j. When the output pin @ jumps from high to
low level , the circuit enters the blocking time T. = 24R, C., during the blocking time, any No input signal can cause the input pin to output a high level until the blocking time passes. Setting a function can effectively suppress various interferences generated during
load switching and improve the reliability of the circuit. RP is the circuit The gain cabinet potentiometer can change the microwave detection distance.     RD9481 is an updated product of RD627, with an overall size of 38 mm × 30 mm × limm, and @-pin dual-in-line plastic package. The typical operating voltage is 12 V. , the operating temperature range is 10 -60℃. The antenna can be bent into a circular ring shape with a diameter of 10bmm. The parameters of other components are shown in the figure, especially for special requirements.