RS485 is a standard for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported. This communication standard is used in a wide range of computer and automation systems. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement Industrial Control Systems, including the most common versions of Modbus…
Category: Electronics
Autonomous Allsky camera with Raspberry PI. Part 2: powering and lightning protection
This is the second part of the Allsky cycle, and I want to describe powering and protection of this device. Please read the first part to get basic information about this project.
Autonomous Allsky camera with Raspberry PI. Part 1: overview.
Allsky (or weather) camera is one of the most important parts of the modern observatory. It’s important to monitor sky conditions during night observations, especially when the observatory is remote controlled or fully automatic. Different vendors provide different solutions. But all they are share the same problems: very high prices, lack of autonomy (PC is required), and lack of useful…
Connecting HTU21D temperature/humidity sensor to the Raspberry PI using simple C i2c interface
Previously in my projects, I’m always used well-known DHT22 (AM2302) temperature/humidity sensors. But I found that these sensors are not very stable and subject to hung. In my case, this device is worked for about two weeks and then stops responding until the power is rebooted. This is absolutely unacceptable on some distant and autonomous devices. After some googling, I…
Isolated eqmod adapter for the telescope control
There are popular and quite cheap amateur telescope mounts from different vendors: Sky-Watcher, Celestron, etc. Most of those mounts contain motors and some controller schematic. Users can control these devices in different ways. One way is to use the mount’s hand controller. Another way is to connect to the computer and use some software to control and guide the telescope.…