Laser

Remote switching with Laser Pointer

The circuit below is similar to the one above but can be used with a laser pointer to toggle the relay rather than a push button. The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to the set input (pin 6). The photo transistor should be shielded from direct light so that the voltage at the set input (pin 6) is less than 1 volt under ambient conditions and moves to more than 10 volts when illuminated by the laser pointer or other light source. The reset time is about a half second using a 4.7uF cap which prevents the circuit from toggling more than once during a half second interval. ..

Laser Data Link schematic

This document tells about one of my experiments with semiconductor laser modules. I bought one semiconductor laser for all kinds of experiments. This TIM202 module is a small (38x14x14 mm) semiconductor laser module, similar to those types used in laser pointers. It takes 3V 45mA and outputs 3-5mW 670nm laser beam. One evening I got an idea to make a simple laser data link using this semiconductor laser module and some kind of receiver. Laser module can be easily modulated by switching it on and off using one transistor. I thought that receiving can be done easily with a one simple phototransistor circuit. ..

RS-232 Laser Transciever circuit

Laser based projects used to be expensive, until the development of solid state lasers. This project is designed for the entry level laser experimenter. The circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam. A low cost transmitter only circuit is also presented here for use in one way communication and other laser based projects. If you are like me and always wanted to buy a laser pointer to play with, but could never find practical uses for one, here are a couple of circuits to convince you to finally make that purchase. Before we begin, however, it is necessary to give a word of warning: Never look directly into the laser beam as eye damage may occur. ..

The first 5 circuits described in the following sections were reverse engineered from commercial HeNe power supplies. There may be errors in transcription as well as interpretation. In many cases, the transformer secondary voltage was not marked and where the actual hardware was not available for testing, an estimate of its value was made. Many of these designs are quite old since modern commercial units tend toward inverter designs since they can be more compact and have higher efficiency. Unfortunately, these are nearly always potted in Epoxy and impossible to analyze. ..

The sensor has two parts: a transmitter and a detector. They can be placed on opposite sides of your victim's path, or they can both be on the same side using a mirror to reflect the beam back. They should be placed 6 to 12 inches from the floor/ground to prevent their being seen. ..

The author's articles of months past focus on the application of 32-bit high-powered processors to amateur robotics and more recently applying CPLD technologies to the same. Continuing on this high-tech trend, this article will cover the concepts and implementation of a Real-time Laser Range Finder based on CPLD Processing of NTSC Video for use in small mobile robotics applications. ..

This application note describes the ADN2841 laser diode driver evaluation kit. The evaluation kit is a demonstration board that provides electrical evaluation of the ADN2841. This document describes how to configure the board in order to operate the part electrically. The document contains the following information: Board description Quick start for electrical operation Description of board settings Component list Schematic of board Silkscreen image of board..

The LMH¾6533 is a 4-channel-input, dual-output laser driver. The dual outputs are meant to drive two different laser diodes, one for CD reading and writing and one for DVD reading and writing. The part has an oscillator that can be set for both amplitude and frequency. The oscillator has two different sets of amplitude and frequency setting resistors, one for the A (CD) output and one for the B (DVD) output channel. The part operates off 5V and can deliver 500 mA of current...

The ADN2841 is a 5 V dual-loop 50 Mbps to 2.7 Gbps laser diode driver. The ADN2847 is a 3 V dual-loop 50 Mbps to 3.3 Gbps laser diode driver. To use the board in an optical configuration, a suitable laser diode must be soldered onto the board...

The design of the Scanning Laser Rangefinder has been broken down into its subsections and the theory and design considerations needed to implement the Scanning Laser Rangefinder have been discussed in length. The design and implementation of a Time-of-Flight range finding system suitable for integration into the Scanning Laser Rangefinder has been attempted...

Thanks to the S6986, the circuit is very simple and requires few components. D2, D3, D5 and D6 forms a bridge rectifier allowing to plug the sensor connector brick in any direction. C1 filters power supply, it must be connected near to IC1 to bypass it properly. IC1 is the Hamamatsu S6986 sensor, the "heart" of this sensor. LED output drives the laser with a 1/16 duty cycle, and the included photodiode collects reflected light. Internal processing circuitry correlates the received light to the emitted light, this enables very reliable detection even with high ambient light...

When the light head has found the brightest spot, it lights up the high efficiency led at the front. The motor is a 10mA @ 2.5V FTB gear motor, partnr 242551 from conrad The 2466 solar panels are carried by a giant 6A diode just for looks...

The computer is a PIC16C84 microcontroller, made by Microchip Technology Inc.. The chip I used runs at 4Mhz. It is in an 18 pin DIP package and has 13 general purpose I/O pins. To accommodate all the I/O I needed, I used a 74150 16-1 line multiplexer to reduce the I/O needed for input on the PIC. The PIC selects which of the 16 inputs it wants via 4 pins, and reads the value of that input via another pin. This means that reading the sensors and buttons requires the PIC to poll the inputs...

The temperature controller must meet some unusual requirements. Most notably, because of ambient temperature variation and laser operation uncertainties, the controller must be capable of either sourcing or removing heat to maintain control...

The ADN8810 is a 12-bit, high output current D/A converter that is controlled through a serial peripheral interface (SPI). The device can be used as a current source for tunable lasers or other precision high output current applications, like 420 mA control loops. Refer to the ADN8810 data sheet for technical specifi cations...