Circuit Description
#astronomy
#telescope
#digital setting circles
#celestial coordinates
#precision measurement
#sensors
#positioning
#navigation
Description: Setting circles on an astronomical telescope are used as an aid to point the telescope at a specific object in the sky based on the object's celestial coordinates. However, setting circles can be challenging to use effectively and are often not precise enough for locating objects within the telescope's field of view. Digital setting circles, on the other hand, can be designed to be much more accurate and relatively easy to use, simplifying the process of finding faint celestial objects without extensive star hopping. Digital setting circles are hand-held electronic devices that, when paired with encoders that accurately measure the telescope's movement along its axes, can indicate the precise direction in which the telescope is pointed or guide the user to a specified object. It is important to note that digital setting circles do not move the telescope; they provide feedback as the user maneuvers it manually. Some digital setting circles systems can interface with a PC and be controlled by software, such as TheSky, Megastar, and Earth Centered Universe, which can communicate with these systems. These software packages integrate with a planetarium view and are useful for portable computers used in the field with telescopes. The project described below is an interface between the encoders mounted on the telescope and a PC running suitable control software. It is not a standalone unit and requires a PC for communication. It is compatible with various digital setting circle interfaces, including BBox, NGC-MAX, SGT-MAX, and MicroGuider III, allowing it to work with many commercial software packages. The design is straightforward, cost-effective, and easy to construct. The components are readily available, and the assembly process is uncomplicated. With some experience in building electronic kits, constructing this interface should be manageable. For those lacking experience, seeking assistance from someone knowledgeable is recommended. A digital setting circles system comprises three main components. Firstly, rotary encoders must be attached to the two axes of the telescope mount. Rotary encoders are devices that measure rotational motion and resemble potentiometers, but they can rotate continuously without stops. Internally, the shaft of the rotary encoder features a clear plastic disk with alternating opaque lines and clear spaces around its circumference. As the shaft and disk rotate, the movement of the opaque lines alternately blocks and unblocks the light path between two emitter/sensor pairs, generating voltage pulses indicating shaft rotation (low when the emitter/sensor pair is blocked by a line, high when unblocked). The emitter/sensor pairs are typically labeled as channels A and B. When the encoder shaft rotates uniformly in one direction, channel A will lead channel B by a quarter of a full cycle, while the opposite occurs when the shaft turns in the opposite direction, allowing the direction of rotation to be determined.
Digital setting circles enhance the usability of telescopes by providing precise tracking capabilities, which are particularly beneficial for amateur astronomers seeking to locate and observe celestial objects with greater accuracy. The integration of rotary encoders into the telescope's mount facilitates real-time tracking of the telescope's orientation, which is crucial for aligning with celestial coordinates. The voltage pulses generated by the rotary encoders can be processed by microcontrollers or dedicated interface circuits that convert the analog signals into digital data. This data can then be transmitted to the PC, where software applications can interpret the information and display the telescope's position on a graphical interface, often resembling a star map.
The construction of the interface involves connecting the rotary encoders to the appropriate input pins on a microcontroller or interface board. The microcontroller should be programmed to interpret the signals from the encoders and communicate with the PC via a serial or USB connection. The software running on the PC should be capable of receiving this data and providing a user-friendly interface for the astronomer. This allows users to input specific celestial coordinates and receive real-time feedback on the telescope's positioning relative to those coordinates.
Furthermore, the compatibility with various digital setting circle systems ensures that users can integrate the interface with a range of existing equipment and software, enhancing flexibility and usability. The simplicity and affordability of this design make it an attractive option for amateur astronomers looking to improve their observational capabilities without a significant investment in complex equipment. Overall, digital setting circles represent a significant advancement in telescope technology, enabling more efficient and accurate astronomical observations.Setting circles on an astronomical telescope are used as an aid to pointing the telescope at a particular object in the sky based upon the object`s celestial coordinates. However, setting circles can be difficult to use effectively and are usually not precise enough for putting objects in the telescope`s field of view.
Digital setting circles, on the other hand, can be made to be much more precise and fairly easy to use, making it relatively simple to find faint fuzzies in the sky without lots of star hopping. What are digital setting circles You`ve probably seen them in ads in the astronomy magazines: NGC MAX, Sky Wizard, and Sky Vector, to name a few.
They`re hand-held electronic devices which, when coupled with encoders which precisely measure the movement of the telescope on its axes, can tell you precisely where your telescope is pointed, or can guide you directly to an object you specify. (It`s worth noting that digital setting circles do not move your telescope. Rather, they simply give you feedback as you move it yourself. ) Some digital setting circles systems interface to a PC and can be controlled by software. TheSky, Megastar, and Earth Centered Universe are examples of commercial PC software which can communicate with digital setting circles systems.
All of these packages integrate a planetarium view with the system and can be quite useful on portable computers used with the telescope in the field. The project which I describe below is simply an interface between the encoders mounted on the telescope and a PC running appropriate control software.
It is not a stand-alone unit it is useless without a PC to communicate with it. It is compatible with several other types of digital setting circle interfaces, including BBox, NGC-MAX, SGT-MAX, and MicroGuider III. This compatibility means that the interface described below will work with many commercial software packages.
My design is simple, inexpensive, and easy to build. I`ve worked hard to document this design so that you can build it yourself. The parts are readily available and construction is straightforward. There is nothing terribly challenging in building this device. If you have some experience with building electronic kits, you can build this interface with no problem. If you don`t, find someone to help you through it, and get some experience for yourself. There are three components to a digital setting circles system. First, rotary encoders must be mated to the two axes of the telescope`s mount. Rotary encoders are devices which measure rotational motion. Visually, they bear some resemblance to potentiometers, except that they have no stops (they are able to rotate continuously).
Inside, the shaft of the rotary encoder has a clear plastic disk with alternating opaque lines and clear spaces between them, all around the periphery of the wheel. When the shaft and wheel turn, the movement of the opaque lines alternately blocks and unblocks the light path between two emitter/sensor pairs.
This is translated into voltage pulses which indicate rotation of the shaft (low when the emitter/sensor pair is blocked by a line, high when not). The two emitter/sensor pairs are arranged such that when one sees the middle of a line, the other sees an edge of a line.
The two emitter/sensor pairs are usually labeled as channels A and B. If the encoder shaft is turned at a uniform speed in one direction, and the voltages from channels A and B are observed, the pattern in Figure 1 would be observed. Note that channel A leads channel B by one quarter of a full cycle (a full cycle is the time taken from when a pulse begins to when the next one begins).
Figure 2, on the other hand, shows the voltages when the encoder shaft turns in the opposite direction. Note that now channel A lags channel B by a quarter of a full cycle. Knowledge of the relationship between channels A and B allows the direction of rotation to be dete
Digital setting circles enhance the usability of telescopes by providing precise tracking capabilities, which are particularly beneficial for amateur astronomers seeking to locate and observe celestial objects with greater accuracy. The integration of rotary encoders into the telescope's mount facilitates real-time tracking of the telescope's orientation, which is crucial for aligning with celestial coordinates. The voltage pulses generated by the rotary encoders can be processed by microcontrollers or dedicated interface circuits that convert the analog signals into digital data. This data can then be transmitted to the PC, where software applications can interpret the information and display the telescope's position on a graphical interface, often resembling a star map.
The construction of the interface involves connecting the rotary encoders to the appropriate input pins on a microcontroller or interface board. The microcontroller should be programmed to interpret the signals from the encoders and communicate with the PC via a serial or USB connection. The software running on the PC should be capable of receiving this data and providing a user-friendly interface for the astronomer. This allows users to input specific celestial coordinates and receive real-time feedback on the telescope's positioning relative to those coordinates.
Furthermore, the compatibility with various digital setting circle systems ensures that users can integrate the interface with a range of existing equipment and software, enhancing flexibility and usability. The simplicity and affordability of this design make it an attractive option for amateur astronomers looking to improve their observational capabilities without a significant investment in complex equipment. Overall, digital setting circles represent a significant advancement in telescope technology, enabling more efficient and accurate astronomical observations.Setting circles on an astronomical telescope are used as an aid to pointing the telescope at a particular object in the sky based upon the object`s celestial coordinates. However, setting circles can be difficult to use effectively and are usually not precise enough for putting objects in the telescope`s field of view.
Digital setting circles, on the other hand, can be made to be much more precise and fairly easy to use, making it relatively simple to find faint fuzzies in the sky without lots of star hopping. What are digital setting circles You`ve probably seen them in ads in the astronomy magazines: NGC MAX, Sky Wizard, and Sky Vector, to name a few.
They`re hand-held electronic devices which, when coupled with encoders which precisely measure the movement of the telescope on its axes, can tell you precisely where your telescope is pointed, or can guide you directly to an object you specify. (It`s worth noting that digital setting circles do not move your telescope. Rather, they simply give you feedback as you move it yourself. ) Some digital setting circles systems interface to a PC and can be controlled by software. TheSky, Megastar, and Earth Centered Universe are examples of commercial PC software which can communicate with digital setting circles systems.
All of these packages integrate a planetarium view with the system and can be quite useful on portable computers used with the telescope in the field. The project which I describe below is simply an interface between the encoders mounted on the telescope and a PC running appropriate control software.
It is not a stand-alone unit it is useless without a PC to communicate with it. It is compatible with several other types of digital setting circle interfaces, including BBox, NGC-MAX, SGT-MAX, and MicroGuider III. This compatibility means that the interface described below will work with many commercial software packages.
My design is simple, inexpensive, and easy to build. I`ve worked hard to document this design so that you can build it yourself. The parts are readily available and construction is straightforward. There is nothing terribly challenging in building this device. If you have some experience with building electronic kits, you can build this interface with no problem. If you don`t, find someone to help you through it, and get some experience for yourself. There are three components to a digital setting circles system. First, rotary encoders must be mated to the two axes of the telescope`s mount. Rotary encoders are devices which measure rotational motion. Visually, they bear some resemblance to potentiometers, except that they have no stops (they are able to rotate continuously).
Inside, the shaft of the rotary encoder has a clear plastic disk with alternating opaque lines and clear spaces between them, all around the periphery of the wheel. When the shaft and wheel turn, the movement of the opaque lines alternately blocks and unblocks the light path between two emitter/sensor pairs.
This is translated into voltage pulses which indicate rotation of the shaft (low when the emitter/sensor pair is blocked by a line, high when not). The two emitter/sensor pairs are arranged such that when one sees the middle of a line, the other sees an edge of a line.
The two emitter/sensor pairs are usually labeled as channels A and B. If the encoder shaft is turned at a uniform speed in one direction, and the voltages from channels A and B are observed, the pattern in Figure 1 would be observed. Note that channel A leads channel B by one quarter of a full cycle (a full cycle is the time taken from when a pulse begins to when the next one begins).
Figure 2, on the other hand, shows the voltages when the encoder shaft turns in the opposite direction. Note that now channel A lags channel B by a quarter of a full cycle. Knowledge of the relationship between channels A and B allows the direction of rotation to be dete
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