PIN diode based fire sensor. PIN diode BPW34 (Fig. 2) is used in the circuit as light and IR sensor. BPW34 is a 2-pin photodiode with anode (A) and cathode (K). The anode end can easily be identified ...

In the circuit, the voltage at pin 3 is set by VR1 so as to keep the output high in a particular light level. The high output keeps the LED off. The PN Photodiode act as the light sensor. When the ...

The presented integrated optical distance measurement sensor works on the time-of-flight principle. The distance information is obtained from the correlation of received light and the transmitted ...

IC UM 3561 is used in the circuit to give a Fire force siren. This ROM IC has an internal oscillator and can generate different tones based on its pin connections. Here pin 6 is shorted with the Vcc ...

This brief offers a fresh insight into the behavior of PIN diodes over temperature. A simple but accurate biasing and control circuit for attenuators and other PIN diode applications is described. The ...

Diode 1N4148 and variable resister of 1k ohm are used here to set a reference or threshold level for the sensitivity of heat. And the sensitivity of the circuit can be adjusted by rotating the knob.

2. This internal view of the PIN diode shows where the anode contact on the chip is wire-bonded to two connection pins. The limiter was built on a 30-mil thick FR-4 printed-circuit board (PCB ...

I then added a pull-up 4.7K ohm resistor across SIG and +V. The LED would illuminate but the probe would not trigger. I then wired it as +V and GND on SENSOR, and SIG on pin PG15, DIAG7 with BAT85 ...

The sensor allows the pilot light to be automatically re-ignited if the flame is no longer present. The circuit is a surprisingly simple one, with a PNP transistor being turned on by the flame ...

IR Sensor Pinout. The IR sensor has a 3-pin connector that interfaces it to the outside world. The connections are as follows: VCC is the power supply pin for the IR sensor which we connect to the 5V ...