The printing of the CALIBREX box requires more than 8 hours of printing with layer height set at 0.2mm and 20% of printing on the two 3D printers tested. The servo motor palette must be printed with White plastic, the M42 female screw ring must be printed with more care, so a layer height of 0.15mm or even 0.10mm is required with a filling rate of 100% for maximum rigidity.
The files necessary for 3D printing in STL format can be downloaded from the links below. The nomenclature number is also indicated:
As you already know, the Calibrex module is equipped with an electronic card, the manufacturing of which we have just seen, with the list of necessary components, and above all the very simple manufacturing circuit board, which is equipped with an Arduino “nano”. You can get it on the net easily and for a very small fee of a few euros.
It is necessary to install the interface IDE Arduino on the Arduino site, you take the latest version 1.8.10, it is necessary to connect your Arduino “Nano” by a USB cable (mini USB socket on the side of the Nano). Finally configure “nano” in the type of card, in the help this is well explained.
Finally once connected select “file”, “open” and you access the “Spectro_nano_embedded” directory. In the directory there are three files (CPP file, H file and Arduino file) you will have to click “Spectro_nano_embbeded.ino” which is the arduino file.
Once powered, three modes selected with the switch of the box are then available.
1- The local operating mode, by successively pressing the push button on the box, the color of the multicore LED determines the commanded function, when starting the Arduino the “Clear” function is selected.
Color of the Multicolored led
2- The remote mode allows with most astronomy software (Maxim, Prism …..) to remotely control via the USB cable, the 4 functions described above. In this case, the red power LED flashes quickly, indicating that the connection is well established between the PC and the Arduino. Jean Luc has programmed an Ascom driver which allows the electronic card to be connected to most astro software for amateurs. By choosing the wheel driver with ASCOM spectro filters you can then select the different functions (“Clear”, neon, flat, close acquisition).
For those who do not use Prism, MaximDl software …. Pierre and Jean-Luc have developed the Calibrex control application in C #, a small application for dialogue with the electronics of the nanoArduino at the heart of the caliber. The Calibrex Control V1.0 application runs on its own and updates automatically, it only needs the SpectroWeel ascom driver installed. Once connected to the driver, the 4 buttons allow you to control the 4 previous functions, the active function is very easily visible by the flashing of the colored rectangle to the right of each button.
Calibrex combines in a single module 42 mm thick, a calibration system and a slot tracking system compatible with UVEX 3, all in 3D printing.
UVEX claims to be an easy to build instrument. It uses 3D printing for mechanical production and uses standard components that can be purchased from companies like ThorLabs (for mirrors, the network, the lens). At the origin of the project, UVEX is perfectly integrated into the Shelyak Instrument system, the slot, the guide cube and the calibration box are those proposed by the company for the ALPY 600 spectroscope. UVEX being a low cost DIY project (Do it Yourself), it was natural to offer a Guidance and Calibration system in 3D printing, only the remaining slot to order from the company Shelyak.
Thus was born the Calibrex project which offers a single compact box which combines the functions of slit guidance and calibration with Argon / Neon lamp (lamp present in choke blocks for fluorescent tube) and a Tungsten lamp.
The electronics are based on Arduino Nano which contains a microcontroller for flash memory and a mini USB port. The lamp control program is therefore saved in the arduino. The control of the lamps and the tilting of the reflector is carried out either by direct control via a switch on the side of the box, or by software via a dedicated ASCOM driver, filter wheel type driver.
A switch on the side of the box selects the remote mode, and the manual mode. In remote mode the switch is deactivated, the command is made exclusively via the CALIBREX USB port. The clear position allows to realize the spectra of the targets as well as the autoguiding, in neon position the ArNeon calibration lamp is on and the palette obscures the beam of the telescope, for the flat position the tungsten lamp is on, and finally in closed position no lamp is lit but the palette obscures the field of the telescope.
From the Ascom driver, you can control the Calibrex box remotely, making it compatible with Remote mode. The advantage of diverting a filter wheel driver and being able to automate the alternation between object spectrum and calibration sequence acquisition in the same way as a three-color imaging sequence via the software automation interface. acquisition of the Prism or MaximDL type.