Simple illumination meter DIY ----- Light Meter Circuit

Keywords: simple illuminometer DIY Simple illuminometer DIY Illumination is the surface density of luminous flux accepted on the subject. The illuminance meter is a instrument for measuring the light bulk on the photo face. Compared with the commercial illuminance meter of a few thousand yuan, this cost is less than 15 yuan, and its value is imagined. After this toy-level illuminance, I can think of how to use it, the first thing is to take this illuminance, and the time to look at the room, see what is different in the illumination of each room. After you have measured, don't stop because residential lighting is standard. Contrast look at it. If this illuminance is expanded, be a illuminance recorder, used to measure your own room, or the lighting situation of a particular place such as a plant greenhouse, is also a very good idea, these scientific data can be used for more in-depth research. . Hardware schematic gossip less, first look at this simple illuminometer. Among them, the current signal of the photoelectric tube S1087 is converted into a voltage signal with the I-V conversion circuit of the core device to the core device, and the built-in ADC of U2 Attiny26 is sent. R5 determines the conversion coefficient, 50 mV / μA; C5 is used to make a correction, filter out high frequency signals. The principle of Q1 in the top of the figure is used to prevent the battery from being reversed, equivalent to the commonly introduced diode; Q2, Q3, Q4 constitute a power switch circuit, control the power of the power supply. The main function of the software code software is to send the ADC's readings, and send them to the display device LED digital tube. The input of the AD converter is 0 - 2.56V, according to this, the strongest illumination of the measured is about 300,000 lux. After booting 60 seconds, the power is automatically turned off. See attachment downloads for detailed software and hardware materials. Illuminance software: zhaoduji_dzdiy.com.rar

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