Environmental sensors include: soil temperature sensor, air temperature and humidity sensor, evaporation sensor, rainfall sensor, light sensor, wind speed and direction sensor, etc., which can not only accurately measure relevant environmental information, but also realize networking with the upper computer, so as to maximize the user's test, record and storage of the measured object data. [1] It is used to measure the temperature of soil. The range is mostly -40~120℃. Usually connected to the analog collector. Most soil temperature sensors adopt PT1000 platinum thermal resistance, whose resistance value will change with the temperature. When PT1000 is at 0℃, its resistance value is 1000 ohms, and its resistance value will increase at a constant rate with the temperature rising. Based on this characteristic of PT1000, the imported chip is used to design a circuit to convert the resistance signal into the voltage or current signal commonly used in the acquisition instrument. The output signal of soil temperature sensor is divided into resistance signal, voltage signal and current signal.
Lidar is a relatively new system in the automotive industry that is growing in popularity.
Google's self-driving car solution uses Lidar as its primary sensor, but other sensors are also used. Tesla's current solution does not include lidar (although sister company SpaceX does) and past and current statements indicate that they do not believe autonomous vehicles are needed.
Lidar is nothing new these days. Anyone can take one home from the store, and it's accurate enough to meet average needs. But getting it to work steadily despite all the environmental factors (temperature, solar radiation, darkness, rain and snow) isn't easy. In addition, the car's lidar would have to be able to see 300 yards. Most importantly, such a product must be mass-produced at an acceptable price and volume.
Lidar is already used in industrial and military fields. Still, it is a complex mechanical lens system with a 360-degree panoramic view. With individual costs in the tens of thousands of dollars, lidar is not yet suitable for large-scale deployment in the automotive industry.
