The customer would be more willing to buy this kind of green laser pointer

The customer would be more willing to buy this kind of  green laser pointer 
Known by the op-amp characteristics, equal to the terminal voltage and terminal voltage, three-terminal voltage is equal to the 6-side output voltage. The photodiode output current range of 4 ~ 20mA, apparently after a resistance R1, 3-side to produce 1 ~ 5V voltage, 6-ended output voltage range is 1 ~~ 5V. Four single-chip data acquisition circuit 1, the A / D conversion optical signal after the photodiode current - voltage conversion circuit to convert the voltage signal, the circuit output voltage of the analog to the microcontroller to collect continuous change The amount of voltage and eventually transmitted to the computer, and then displayed by the computer in real time. Voltage analog must first be converted to digital, will be used in the ADC. For the parts and components of green laser pointer  which need to be procured.
ADC0809 integrated circuit chip is a 5V power supply, using the principle of successive approximation converter, 8-way 0 to +5 V analog voltage programmable analog-to-digital converter of the general-purpose time-sharing conversion. Can be directly connected with the computer system without the need for additional interface circuit, with the conversion start and stop control side, the conversion time of about 100μ s, low power consumption is about 15mW, operating temperature range of -40 to +85 degrees Celsius. Application interface circuit schematic diagram is shown below: Figure 7 ST with the ALE linked latches the channel address signals A, B, C, and its falling edge of the A / D converter to start the simulation of the selected The input signal conversion. The temperature of warehouse where keeps green laser pointer  should be maintained at the room temperature.
When the end of the conversion, EOC goes high, the result of the conversion into the tri-state latch. OE allows the output signal goes high, three-state output latch to open the 8-bit data for read by the MCU to complete a conversion. 2, the data show the analog voltage signal by A / D converter into a digital signal after the digital signal into the microcontroller, microcontroller collected data is organized into data packets to a PC via RS-232 serial port to send data through the calculation of the seven machines to handle the final real-time display from the PC machine. 863 new materials technology of solid-state laser and its application technology. The worker can use it to manufacture and assemble green laser pointer when necessary.