Infrared sensor high voltage dangerous voice warning circuit diagram

The pyroelectric infrared sensor head operates as illustrated in the accompanying figure. Upon detecting an infrared signal from a human body within its monitoring zone, the sensor head generates a positive pulse signal. This signal is transmitted to the input terminal designated as point P. The integrated circuit IC1 utilizes a 555 timer in a monostable configuration, with the trigger circuit comprising the 555 timer, resistor R3, and capacitor C2. The pulse signal at point P is processed and amplified.

The pyroelectric infrared sensor head is designed to detect infrared radiation emitted by human bodies, making it suitable for applications such as motion detection, security systems, and automatic lighting. The sensor head typically consists of a pyroelectric element that generates a voltage when exposed to varying infrared radiation levels. This voltage change, when a human body enters the detection zone, is converted into a positive pulse signal.

The 555 timer IC, configured in a monostable mode, is an essential component of this circuit. In this configuration, the output remains low until a triggering event occurs, which in this case is the positive pulse signal from the sensor head. The resistor R3 and capacitor C2 determine the duration of the output pulse. When the signal at point P is received, the 555 timer generates a single output pulse whose width is defined by the time constant of R3 and C2. This output can be used to trigger additional circuits or systems, such as alarms or lights, enhancing the functionality of the sensor system.

The amplification of the pulse signal ensures that it is strong enough to drive subsequent components in the circuit. The design of this sensor system is critical for ensuring reliable operation in various environments, and careful selection of components such as R3 and C2 is necessary to tailor the response time and sensitivity of the system to meet specific application requirements.Pyroelectric infrared sensor head is same with the figure. When it detects the human body infrared signal in guarding zone, the sensor head will output a positive jump pulse signal, this signal is added to input terminal P point. IC1 adopts 555 time base circuit, the monostable trigger circuit is composed of 555 and R3, C2. P`s jump signal is phased and amp.. 🔗 External reference