{"id":7594,"date":"2022-06-14T06:10:17","date_gmt":"2022-06-14T05:10:17","guid":{"rendered":"https:\/\/blog.fh-kaernten.at\/ingmarsretro\/2022\/06\/14\/uv-sensor-logger-self-made\/"},"modified":"2022-06-14T06:10:17","modified_gmt":"2022-06-14T05:10:17","slug":"uv-sensor-logger-self-made","status":"publish","type":"post","link":"https:\/\/blog.fh-kaernten.at\/ingmarsretro\/2022\/06\/14\/uv-sensor-logger-self-made\/?lang=en","title":{"rendered":"UV sensor logger self-made"},"content":{"rendered":"
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When summer comes, new ideas come. In the summer months, as is well known, the duration of sunshine is longer and the intensity of the sun’s rays is higher. Many use this property of the sun to boost their body’s vitamin D production, while others lie under the source of radiation to darken their skin color due to the high UV component. This, in turn, supposedly increases their attractiveness and stimulates hormone production and the willingness to mate… Unfortunately, the non-visible UV range in the spectrum of sunlight is known to have negative effects on the human body. Sunlight can also be used technically. On average, the power of the sun per unit area is assumed to be 1000W per m\u00b2. Large-area P-N junctions in semiconductor materials are now able to generate electrical energy with an efficiency of up to aprox. 22%.<\/p>\n

But the energy can also be used in other ways, or the UV component. Many retro collectors are certainly aware of the problem with yellowed old plastic cases. In order to get this under control, or to get it back to its original state from 30 or 40 years ago, you use H2O2, i.e. hydrogen peroxide and UV light, to get a bleaching process going. And so I came up with the idea for the following project.<\/p>\n

At an online electronics store I found a UV sensor board from the manufacturer Waveshare in the sale. On it is a LITEON OPTOELECTRONICS LTR390 chip including a level shifter circuit. An I\u00b2C bus is available as an interface. A look at the data sheet revealed to me that the sensor records two wavelength ranges and outputs them separately. The ALS (Ambient Light Sensor from 500-600nm) and the UV (Ultra Violet range from 300-350nm). You can quickly make a simple logging board with this – I thought to myself. So I figured the board should be able to do the following:<\/p>\n