Motorisation de Focuser

par le Fév.12, 2019, sous Astronomy, récupération

Pour motoriser mon Focuser j’ai récupéré un moteur pas à pas (stepper) avec son engrenage réducteur dans un scanner.

Le moteur de 35mm de diamètre et 10 mm d’épaisseur est un 48 pas (7,5°) mais avec son réducteur 21/1 il se prête bien à cette utilisation.

les étapes décrites dans ce pdf sont on ne peut plus simples.

Tout est de récupération, même l’enveloppe plastique qui vien du dépeçage d’une imprimante.

Afin de pouvoir régler facilement à la main, j’ai mis une des roues dentées en place avec un ressort. A l’aide d’une platine coulissante je peux débrayer.

Bonne lecture

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August 15th 2013

par le Mar.09, 2014, sous Astronomy

Taken in Schoenau, Alsace on aug 15th 2013. 250/1200 Canon EOS1100D

M27, planetary nebula, Dumbbell Nebula / Haltere

M11, Cluster, Wild Duck / Canard Sauvage

M17, Omega Nebula / Nebuleuse du Cygne



M31, Andromeda Galaxy, Gelaxie d’Andromede

M45, Pleiiades, wrong shot when telescope was still slewing



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Pic Astro and Pic Programming

par le Nov.26, 2012, sous Astronomy, Microcontrôleurs

I had some issues with « PicAstro ».

Suddenly no response on PC side (Serial) nor on motor side.
The beast is dead.

So, first I checked what’s going on at microcontroller level. No live signals, no response on any Input, simply the clock was running, nothing else.

So I decide to verify if I can reprogram the bootloader.
But I have no PIC programmer.
No problem I will built a cheap one based on JDM (on internet) but reduced to the strict minimum.

The programmer is built, but the PIC does not answer, dead.

I buy a new PIC (waiting is horrible in these cases) and try. It works.
I put the brand new programmed PIC in the socket, start the PicAstro and I am able to connect with “Tinybld” and so to flash the application hex file.

Flashing is successful and then surprise, the DE motor runs as expected, but the AD motor does not.
It seems there is a roughly 1 Hz pulse in the background and when I make the motor turning with the PAD the motion is not smooth at all and even there is no torque.

For me it is clear, suspect number one is the L298 driver …
I decide to just modify the Logic to Power interconnection to use the (supposed) sane DE circuit but with the AD signals.
Same result, so error does not come from the Motor Driver circuit.

I test of all the signals with the scope and I find out that when I test the RB5 output the PIC stops …
Why, RB5 is supposed to be an output, why does it influence the PIC software?

After multiple other checks (is my programmer ok ???) I discovered that the new PIC comes with the LVP (Low Voltage Programming) bit set which has as a consequence that RB5 cannot be used as general purpose I/O …

So I decided to modify the programmer in order to program the PIC in High Voltage Mode so that I can overwrite the LVP bit.

After that everything works and I even discovered that the original PIC was not dead, simply the LVP bit was already reset so not recognized by the LVP programmer.

Moral of the Story … Do not trust to LVP, go directly to HVP so everything can be done without restriction and … frustration

See programmer sketch hereunder.


See Kicad 3D view:
PIC High Voltage Programmer
Complete Kicad Files:

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EQ6 Improvements

par le Oct.24, 2012, sous Astronomy

I just received my EQ6 mount.

This mount is really robust but has a lot of little but anoying conception errors.
– Azimuth axis is metal to metal so it is very hard to move
– Declination adjustment is very hard to set-up at latitudes higher 30°

So I decided to fix the issues.

First adding a teflon washer in the azimuth axis
Second extending the notch on the declination.
See picture below

Additional Notch glued and screwed

Next modification will be the replacement of the two motors and gears with new 400 step Nanotec motors and belts.
The motors will be mounted on a new plate that will replace the original front plate of the electronics.
The motors will be controlled by a developement based on the PIC ASTRO web page.
and other links on the Astrolabo web page

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