Because of messengers detection gear conceptual design of PICl6F628A one-chip computer
This device is based on the PIC16F628A microcontroller and utilizes a pair of independent ultrasonic transducers for both transmission and reception. It employs the Doppler effect to effectively detect whether someone enters a designated area and can control the lighting equipment through a switch output signal. The device can conveniently conduct valid surveillance of moving bodies within a specific space. This text introduces a detection system designed to utilize the ultrasonic Doppler effect. The design improves upon previous ultrasonic sounding hardware circuits and employs software programming to effectively monitor the status of individuals. When there is relative motion between the sound source and the acoustic wave receiver, the frequency of the received signal differs from the frequency of the transmitted sound wave. This frequency shift is related to the relative velocity between the sound source and the receiver, which is a consequence of the Doppler effect. The design positions the ultrasonic transmitter and receiver to remain stationary, allowing the detection of moving obstacles within the detection range. The device is equipped with both a transmitter and an echo microphone for ultrasonic waves, facilitating easy installation. The maximum detectable range is adjustable between 1 to 5.5 meters, effectively monitoring motion within this space. Upon detecting motion, the device outputs a 12V control signal to activate the lighting system. The duration of this output signal can be adjusted between 15 to 1800 seconds. The device features independent ultrasonic transducers for transmission and reception, and its hardware system is primarily composed of a microprocessor, a transmitting section, and a receiving unit. The microprocessor utilized is the PIC16F628A, produced by Microchip Technology, which features 18 pins, operates at a standard voltage of 5V, and can achieve a maximum clock frequency of 20 MHz. It includes a rich set of internal resources, such as a 16-bit timer/counter, 2KB of Flash program memory, 224 bytes of data memory, two analog comparators, a PWM control device, and several timers and counters. The PIC16F628A can also respond to various hardware interrupts, enabling efficient use of peripheral circuits and reducing design costs. The ultrasonic transmitting transducer used is the 328ST160, with a center frequency of 32.81 kHz. The PWM control device from the PIC16F628A outputs an 8 kHz square wave signal through the RB3 port, which is amplified in voltage and current by transistor Q1 and the 4069 inverter, thus driving the transmitting transducer. Transistor Q2 is designed for system self-testing. During normal operation, the RB0 port continuously outputs a low level.
The circuit design of this device integrates several critical components to ensure effective operation. The PIC16F628A microcontroller serves as the central processing unit, managing the signal processing and control logic. The ultrasonic transducers are strategically positioned to maximize detection sensitivity within the specified range. The use of the Doppler effect allows the device to detect changes in frequency due to movement, providing a reliable mechanism for motion detection.
The circuit includes a power supply section that regulates the voltage to the microcontroller and other components, ensuring stable operation. The output stage, which drives the lighting system, is designed to handle the 12V control signal, allowing for direct connection to various types of lighting equipment. The adjustable parameters, such as the detection range and output duration, are facilitated through user-friendly interfaces, enabling customization based on specific application requirements.
Additional features include safety mechanisms to prevent false triggering caused by environmental noise or other disturbances. The self-test functionality ensures that the system is operational before deployment, providing an added layer of reliability. Overall, this device exemplifies a sophisticated approach to motion detection using ultrasonic technology, with applications in security systems, automated lighting, and other areas where motion surveillance is critical.This device is based on PICl6F628A one-chip computer, adopt one pair and receive and dispatch the independent ultrasonic transducer, utilize the Doppler effect, can detect in certain space whether someone enters effectively, and can output the switch of the lighting equipment of signal control. Can use supersonic wave the very convenient one to carry on valid survey to the inner body in motion
of certain space, convenient to have installation, survey the effectual characteristic. This text introduces the detection gear of a kind of messenger utilizing ultrasonic Doppler effect to be designed. This design uses PICl6F628A one-chip computer, improve the ultrasonic sounding hardware circuit used in the past, utilize programming of software to survey messenger`s situation effectively, then the switch of the output control signal control illuminator.
When there is relative motion between sound source and acoustic wave receivering, the signal frequency that the acoustic wave receiver receives will be different from travelling sound of wave frequency, the deficiency of frequency relates to relative movement velocity between sound source and receiver, this is that the Doppler effect causes. Design, adopt ultrasonic sender and receiver towards immobilize with the direction originally, when there are obstacle objects to move towards or keep away from the two and move, the relative motion exists between obstacle surface sound source and receiver of mirror image formed toward reflection effect of the acoustic wave to can be regarded as, can utilize the Doppler effect too, judge whether someone moves in the detection range according to signal that the receiver receive.
This device has launching and echo microphone of supersonic wave at the same time, it is convenient to install while using. The positive maximum detectable range is in 1- 5. 5 m is adjustable, can survey the body in motion in this space effectively. Output the switch of 12 V signal control illuminator after detecting the body in motion. His output 12 V`s duration can be here 15- 1 800 S is adjustable. This device adopts and launches and receives and differentiates the independent ultrasonic transducer, the hardware system can basically be divided into part of a microprocessor, radiating portion and receiving unit.
What the microprocessor used is PICl6F628A one-chip computer that Microchip Company produces, its pin is shown as in Fig. 1. This one-chip computer, in order to simplify the instruction set type processor RISC, There are 35 assembler commands in all, it is effective to use simply.
PICl6F628A has 18 pins in all, standard working voltage is 5 V, connecting Jingzhen maximum can reach 20 MHz. Its internal resource is profuse, contain the timer / counter of 16 the data storages of Flash programm store of 2 KB, 224B, 2 analog comparators, a PWM control device, 1, 1 8 timers / counters, 1 and 8 timers, and power up starting circuit, power down reset circuit and watchdog`s circuit, etc.
PICl6F628A can also respond to many kinds of hardware interrupt such as timer, comparator, RB port and use these resources and simplify the peripheral circuit effectively possibly, cost to reduce products design not in use originally, resources were not listed here on-chip. Launch some circuit diagram and is shown as in Fig. 2. The ultrasonic transmitting transducer adopts 328STl60, his center frequency is 32. 81. O kHz. Use PWM control device of PIcl6F628A one-chip computer, is exported about 32 by RB3 port. The square wave signal of 8 kHz, and carry on the amplification of voltage and electric current through triode Q1 and 4069, thus drive the transmitting transducer to transmit out the ultrasonic signal.
Among them the triode Q2 is designed for systematic self test. In normal survey, RBO port been exporting the low level all the time, has made the 🔗 External reference
The circuit design of this device integrates several critical components to ensure effective operation. The PIC16F628A microcontroller serves as the central processing unit, managing the signal processing and control logic. The ultrasonic transducers are strategically positioned to maximize detection sensitivity within the specified range. The use of the Doppler effect allows the device to detect changes in frequency due to movement, providing a reliable mechanism for motion detection.
The circuit includes a power supply section that regulates the voltage to the microcontroller and other components, ensuring stable operation. The output stage, which drives the lighting system, is designed to handle the 12V control signal, allowing for direct connection to various types of lighting equipment. The adjustable parameters, such as the detection range and output duration, are facilitated through user-friendly interfaces, enabling customization based on specific application requirements.
Additional features include safety mechanisms to prevent false triggering caused by environmental noise or other disturbances. The self-test functionality ensures that the system is operational before deployment, providing an added layer of reliability. Overall, this device exemplifies a sophisticated approach to motion detection using ultrasonic technology, with applications in security systems, automated lighting, and other areas where motion surveillance is critical.This device is based on PICl6F628A one-chip computer, adopt one pair and receive and dispatch the independent ultrasonic transducer, utilize the Doppler effect, can detect in certain space whether someone enters effectively, and can output the switch of the lighting equipment of signal control. Can use supersonic wave the very convenient one to carry on valid survey to the inner body in motion
of certain space, convenient to have installation, survey the effectual characteristic. This text introduces the detection gear of a kind of messenger utilizing ultrasonic Doppler effect to be designed. This design uses PICl6F628A one-chip computer, improve the ultrasonic sounding hardware circuit used in the past, utilize programming of software to survey messenger`s situation effectively, then the switch of the output control signal control illuminator.
When there is relative motion between sound source and acoustic wave receivering, the signal frequency that the acoustic wave receiver receives will be different from travelling sound of wave frequency, the deficiency of frequency relates to relative movement velocity between sound source and receiver, this is that the Doppler effect causes. Design, adopt ultrasonic sender and receiver towards immobilize with the direction originally, when there are obstacle objects to move towards or keep away from the two and move, the relative motion exists between obstacle surface sound source and receiver of mirror image formed toward reflection effect of the acoustic wave to can be regarded as, can utilize the Doppler effect too, judge whether someone moves in the detection range according to signal that the receiver receive.
This device has launching and echo microphone of supersonic wave at the same time, it is convenient to install while using. The positive maximum detectable range is in 1- 5. 5 m is adjustable, can survey the body in motion in this space effectively. Output the switch of 12 V signal control illuminator after detecting the body in motion. His output 12 V`s duration can be here 15- 1 800 S is adjustable. This device adopts and launches and receives and differentiates the independent ultrasonic transducer, the hardware system can basically be divided into part of a microprocessor, radiating portion and receiving unit.
What the microprocessor used is PICl6F628A one-chip computer that Microchip Company produces, its pin is shown as in Fig. 1. This one-chip computer, in order to simplify the instruction set type processor RISC, There are 35 assembler commands in all, it is effective to use simply.
PICl6F628A has 18 pins in all, standard working voltage is 5 V, connecting Jingzhen maximum can reach 20 MHz. Its internal resource is profuse, contain the timer / counter of 16 the data storages of Flash programm store of 2 KB, 224B, 2 analog comparators, a PWM control device, 1, 1 8 timers / counters, 1 and 8 timers, and power up starting circuit, power down reset circuit and watchdog`s circuit, etc.
PICl6F628A can also respond to many kinds of hardware interrupt such as timer, comparator, RB port and use these resources and simplify the peripheral circuit effectively possibly, cost to reduce products design not in use originally, resources were not listed here on-chip. Launch some circuit diagram and is shown as in Fig. 2. The ultrasonic transmitting transducer adopts 328STl60, his center frequency is 32. 81. O kHz. Use PWM control device of PIcl6F628A one-chip computer, is exported about 32 by RB3 port. The square wave signal of 8 kHz, and carry on the amplification of voltage and electric current through triode Q1 and 4069, thus drive the transmitting transducer to transmit out the ultrasonic signal.
Among them the triode Q2 is designed for systematic self test. In normal survey, RBO port been exporting the low level all the time, has made the 🔗 External reference
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