Light meter circuit | Next Electronics

Advances in Measurement Sensor Tech circuit

This issue features articles on various measurement and sensor-related embedded design projects. Readers are encouraged to attempt similar projects and share their results. Starting on page 14, Petre Tzvetanov Petrov describes a multilevel audible logical probe design. Petrov notes that...

Scoobas Solution Sensing Tactic

This document serves multiple purposes, primarily to document the methods employed by a Scooba robot to detect: a) the presence of an acceptable cleaning solution being delivered to its pump, and b) the excess presence of used solution collected off...

The alarm circuit diagram for safety box and other metal objects

When an individual touches the safety box or other protected metal objects, the sensor circuit generates a pulse to the alarm circuit. The positive edge of this pulse activates the semiconductor and thyristor flash GE, subsequently triggering the camera to...

THREE RANGE LIGHT METER

This circuit utilizes a probe that contains a Clairex 905HN light-dependent resistance element, which is connected to a DC differential amplifier. The amplifier drives a meter with a specially calibrated scale. The article outlines the calibration procedure. A switching circuit...

Optical Pulse Generator

This device was initially designed to test the Shutter Time Meter, specifically intended for analog SLR cameras. To accurately measure the exposure time of a camera, it must first be verified with a well-defined signal. This circuit serves that purpose...

Agricultural harvester warehouse full schematic reminder

The circuit functions as a reminder system utilizing a photodetector amplifier circuit along with a sound and light alarm circuit, as illustrated in Figure 1. The photodetector amplifier circuit consists of a pilot light (HL1), a light switch (S1), a...

Add a sensor to a board and measure something with it

This week's plan is to build a device that warns of the potential for a knockdown, which is the process by which an over-canvassed ship is laid over on her beam-ends. The risk of sinking is high during this event,...

Optical Proximity Detector Circuit

A reflector isolator detects the presence of an object by bouncing light off of it. This technique is useful in circuits that detect when an object is close enough to the sensor. A reflector isolator is a type of optical sensor...

Optical-pick-up-tachometer

The purpose of this simple circuit is to enable remote, non-contact measurement of the speed of rotating objects. The circuit exhibits high linearity and accuracy, typically constrained by the milliammeter utilized and the initial calibration process. It is configured to...