Homemade LED Digital Table ----- Simple Photometer

Homemade LED digital photovoltaic table, Simple Photometer Keywords: light attached circuit diagram The author is in a solar stream brightization project. In the case of such a problem, there is a batch of solar panels to detect short-circuit currents and open circuit voltages. The number of circuits is large, and the day is working. Some in the morning, some noon. Results The data is very difficult to unconjective. This is because the sun has not constant in the day. Of course, the power generation is different, and it is not possible to form. To get a relatively consistent parameters, you must test under the same light intensity conditions, urgently need a photovoltaic table or lumen. For emergency, the author uses several electronic components to make an LED number display, the two-stop photovoltaic table, the on-site test effect is ideal, not only can detect the strength of the sun, but also the diagraque table identification LED light, firefly Light lamp, incandescent lamps. The Dragon has the more clear when the ambient light is, the more it is displayed, and there is a unique advantage than the LED. Its cost is only tens of dollars. , The photosensitive element can be purchased from the market, and the photoelectric battery is 3.5 cm × 10cm. The detection sensitivity is very good. The most power generation is as high as 3.6V during strong sunshine, and the rainy day is 2.5V. In the dark, it can be born with 150mV, which has different reactions to various illuminants. Since the spectral reception range is wide, the sensitivity is high, it can be exempted from the predecessor amplifier, directly drive the LED digital header. The display element is a three-semi-LED digital display head (200mv), and the operating power supply is 5V. See the drawings in the drawings. The positive and negative poles are output in the solar panel. And three series of resistors: R1, R2, and R3. K1 is a double-throw double synchronous conversion switch When K1-1 is closed, the test range is 0V ~ 20V; When K1-2 closes, the number is positioned in D2 (ten); When K1-3 closed test range 0V ~ 2V; Similarly, K1-4 is closed to position the digital decimal point in D1 (bit), and the sunlight intensity can be measured with the first gear A point signal, and the B-point can measure the weak brightness of the LED lamp with the second gel. The whole power supply uses a 5th battery 4 to 6V, and the working current is about 50mA, as long as the component is correct, it can be successfully assembled. This photovoltaic table is due to different solar cells, and cannot be used as standard instruments, but can be used as an identification tool for comparison light intensity in the work. Its use is also very wide, such as used in dark rooms, breeding greenhouses, flowers and bird greenhouses, etc. need to detect light intensity. Author: Liu Decun