Laser detection indicating device design circuit diagram

Overview:
Lasers are widely used in industry. In the past, in the field of measurement and indication, the effects were often observed by the naked eye. The following describes a device that can detect laser light (red light 650 nm) and replace the human eye with an indicator light alarm and indication through the relevant electronic circuit to improve measurement and indication accuracy.


Working principle This design considers the application of a type of light emitted by a laser, uses a phototransistor to detect whether it is received, and then uses wireless transmission to transmit information to the receiving end, and finally processes it to indicate the detection result. The working principle is shown in the figure below.

</p><p>Laser and its circuitThe design of the laser is cost-effective and can emit 650nm red light. Considering comprehensively: semiconductor laser technology matures early and develops rapidly. Its wavelength range is wide, its fabrication is simple, its cost is low, and its size is small, its quality is light, and its life is long. Therefore, semiconductor lasers are selected. Since the project was originally applied to gear correction, a milliwire-level word line semiconductor laser was selected. </p><p>The operation of a semiconductor laser has a lot to do with the drive power. Many factors, such as transient current or voltage spikes, can easily damage the laser. A power-supply detection circuit was designed that utilized Maxim's MAX810. The MAX810 is a single-function microprocessor reset chip that monitors the supply voltage of microcontrollers and other logic systems. It provides a reset signal to the microcontroller during power-up, power-down, and power-saving conditions. When the supply voltage is lower than the preset threshold voltage, the device will issue a reset signal until the supply voltage returns to above the threshold voltage for a period of time. The MAX810 has a high-level active reset output. The MAX810's threshold voltage is 2.63V, which is designed for 3V power supplies. A reset signal is generated when the supply voltage drops below the reset threshold. This reset signal is held until the supply voltage is above the threshold voltage for at least 140ms, after which the reset signal is released. This delay time helps to ensure a valid reset signal in the event of a power supply voltage instability. The circuit is shown below. </p><p><img width="612" height="340" src="http://i.bosscdn.com/blog/nophoto.gif" alt=

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