Comparing Light Sensors for FarmBeats скачать в хорошем качестве

Comparing Light Sensors for FarmBeats

I do not understand why Seeed and Microsoft chose a poor light sensor, the Grove Sunlight Sensor for FarmBeats. While on paper its specs look good as it is supposed to report visible light, infra red radiation and ultra violet intensities. The results from Seeed's combined software and hardware implementation give you garbage for the visible light measurements. This video is about the method I used to compare various light sensors and select which one I will use in future FarmBeat configurations. I compare other Grove light sensors from Seeed including their Grove Digital Light sensor and Grove Light. I compare these with the latest digital light sensor from M4Stack - the DLight HAT for the M5StickC computer. For the hardware I use a Seeed Studio Seeduino Nano with Grove carrier connected to the Grove sensors including the Grove Sunlight Sensor and this is connected via the UART to a M5StickC computer which also hosts the DLight HAT. I use the Arduino IDE for both the Nano and M5StickC computers and I had to learn how to use the Arduino APIs for Buttons, RTC and multi serial ports. All software drivers including for the new DLight HAT for the M5StickC where provided by M5Stack The FarmBeats software on the Raspberry Pie feeds its UART2 serial data into node-red and this is transmitted via MQTT and wifi to a M5Stack ATM bridge that connects to MS Data Streamer and MS Excel. In the end both the Grove Digital Light sensor and the M5Stack DLight sensor gave reasonable results and as a bonus I could rely its the luz values reported. There is still a need to calibrate the measurements if you want them in lux. At $US4.95 the DLight is a bargain at more that half the cost of the Seeed Studio alternative. There is no need to abandon the Seeed Grove Sunlight sensor - just use it for comparative measurements of visible, IR and UV irradiation but do not trust the absolute measurements and the near darkness measurements are rubbish. My choice is the M5Stack DLight. In my next video I will report on the measurements I obtained. I will also repeat the measurements and compare them with a calibrated lux meter and a calibrated variable Neutral Density Filter to speed up getting the results.