beam break detector for camera shutter or flash control
The circuit utilizes an infrared (IR) detector (IC3) that senses the interruption of an IR beam, which serves as a triggering mechanism for the LM 7555 CMOS timer (IC2). In monostable mode, the timer is configured to produce a single output pulse when triggered. The timing duration is determined by external components connected to the timer, typically a resistor and capacitor, which set the time interval for how long the output remains high.
Upon the detection of a beam interruption, the IR detector sends a signal to pin 2 of the LM 7555, which triggers the timer. The output at pin 3 of IC2 then transitions to a high state, remaining active for a predetermined time, approximately half a second in this design. This output high state is crucial as it serves two primary functions: it turns off LED1, indicating the system is in an alarm state, and it activates transistor Q1.
Transistor Q1 functions as a switch, controlling the low-power relay. When Q1 is turned on by the high output from the LM 7555, it allows current to flow through the relay coil, energizing the relay. This action can be used to control various devices or alarms, depending on the application. The relay can switch on lights, sound alarms, or interface with other systems, providing versatility in its use.
The overall design emphasizes low power consumption, making it suitable for battery-operated applications. The use of the LM 7555 CMOS timer ensures minimal power draw during operation, while the relay allows for the control of higher power devices without directly engaging with the timer's output. This circuit can be effectively utilized in security systems, automatic lighting, or any application requiring beam interruption detection.The IR detector (IC3) controls an LM 7555 CMOS timer (IC2) which operates in mono stable mode. When the beam is broken, IC2 is triggered and its pin 3 output goes high for about half a second. This extinguishes LED1 and turns on transistor Q1 to drive a 5V low-power relay.. 🔗 External reference
Related Circuits
Logic power control of an analog regulator can be useful in applications where a digital circuit or controller needs to manage a power source, such as in EEPROM. In electronic systems, managing power effectively is crucial for the performance and...
The electronic switch consists of the CK-4 type magnetic control switch and the components VT1, R1, and R2. When the bathroom door is closed, the permanent magnet ZT and the reed switch GA come into proximity, which separates the...
This circuit is designed for processing sonar data signals recorded on high-quality analog tape recorders. The envelope detector employs readily available components and provides accuracy exceeding 100 kHz. It utilizes two LM301 operational amplifiers configured as precision absolute-value circuits,...
This is a three-mode lamp dimmer circuit with touch control. This circuit can be used to control a lamp in three operation modes: dim, off, and bright. It utilizes a NE555 timer. The three-mode lamp dimmer circuit designed with touch...
The Arduino Uno features an ATMEGA328P-PU microcontroller and various additional components on the board. The objective is to program the microcontroller without relying on the Arduino software, utilizing only the essential components. The goal is to develop projects independently...
The circuit operates with relevant components highlighted in the manual's draw mode. Figure A presents a circuit schematic, while Figure B illustrates a typical conventional secondary circuit layout. Figure E showcases an improved secondary circuit schematic diagram that incorporates...