Magnus replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 5 days ago

RobJones wrote: you might try a count weight along the plane of the flap.
provided you have clearance along the OTA, then only a very small weight would be required.


This would of cource depend on the orientation of the scope when unparking.
I park my scope at alt +1, so a counterweight would not work when unparking the cap at that position.

However... You could add a spring to the equation. Fasten it so the spring is slightly tensioned when the lid is at it heaviest. This might cause the lid to not stay completely closed when the servo is not powered, so possibly not a god idea? Ebay id for some springs 281291676039

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Magnus replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 5 days ago

Great work, and nice to see you are making progress :)

Something you can try to be 100% sure that it is a weight issue is to see that your servo in fact can move further with the lid disconnected (just remove the bolt that is connecting the brass / anodized servo horn to the wood linkage.

The reason for this is that from watching the video I'm not entirely sure if the lid stops when it has past the point where it's the heaviest, or just after.
(When I think about it, you don't have to unscrew anything. Just point the scope at the zenith. If it fails to move at all or if it opens to the expected position, it's the weight for sure).

However it might be servo centering. When you hear the bussing at the most open position, and it stops to move then it is binding.
There is three ways a servo can bind.
1. The object that is being actuated reaches a mecanical endpoint, and can move no further.
2. The object being moved is to heavy and the servo motor is skipping.
3. Internal binding.

If the weight test above do not proove it's the weight (i.e servo motor skipping) then it's allmost certanly internal binding.
Servos work at a PWM pulse from 0.5 - 2.5, at least some of them! There is no standard that ceeps a servo from actually woriking in PWM range 1.0 - 2 as an example.
If you tell a servo to go to PWM 0.5, and it has internal limits at 1, then the servo will appear to bind, even if it is not binding at an endpoint or skipping from overload.

If you have not done so allready, you can disconnect the servo horn completely, and try to Park / Unpark while encreasing / decreasing the (Max travel limits [set open travel (ms), set close travel (ms)]) in the Calibrate tab. You should aim for the limits closest to 0 and 3 that you can acchieve while the servo makes no sound at the endpoints. You should do this while the (Preffered travel limits [set open limit (%), set close limit (%)]) is set to 100, 100

After that set your close limit to 90 - 95%, park the cap and attach your servo horn and linkage while the lid is closed against the telescope. (Then you have 10 - 5 % to work on when the lid is connected to the servo, to ensure that it can close fully). Leave your preferred open limit at 100%, as it does not look like your setup will bind.

Hopes this helps to determen if you need new servo / lighter lid, or if you can calibrate it out, (not sure if I explaned thiswell enough on the github readme, so tought I'll go into some detail :) )

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 3 weeks ago

RobJones wrote: A very professional job!
If you are happy to share your STL files for the £D printer design, i'm very temped to have a go myself. :)


Thanks, I've uploaded it to my profile on thingiverse www.thingiverse.com/thing:2371144
Feel free to comment if you have any issues printing it.

I also edited it slightly since the last post. A hole big enough for a micro usb cable is now added. (I think I'll just drill one in mine as it's allready printed, but it should be a nice addition :) )

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 3 weeks ago

Thanks :)

It all depends on shipping times.

I ordered all the sensors from ebay, and they all had 10 - 35 days shipping.
I have been supprized sometimes when ordering things from China and got the items closer to the 10th than the 30th day.

I will order the arduino and the wifi module, so I can set everything up and be ready to install sensors.

Btw. Does the indi driver for indoino meteostation connect to the arduino ower the network, or does it need to be connected in some other way?
I also tested the solar cell in cloud free daylight ~17:00 pointed at the sun. It was producing around 2.5v, so I think I can connect it directly to the arduino without any resistor to split the voltage.

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 3 weeks ago

So now the glass is cut and drilled, and a new 'frame' to screw on the glass with even pressure.

I printed the top gasket in PLA (hard material) to use as a cutting / drilling template, so getting the holes right was easy.
I have also sourced a solar cell from a led light that I was not using. I'll have to check it at midday when it's not clouded to see that it does not generate to hig current. It registered 1.5v under a bright light, so I'm thinking it will be ok.

Pictures of the complete box. Whit the new 'frame' on top it's now 10^3cm







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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 4 weeks ago

Yup :)

3d printin can be wery neat if the limitations have been considured when designing the part.

This print is actually printed at 0,3mm layer height, witch is about the lowest 'resolution' recomended for a printer with a 0,4mm nozzle.

It could be even smoother at 0,1 mm layers, but would take much longer to print.

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 4 weeks ago

Print done! From Idea to working part in two evenings :)

I took some assembly pictures for pending howto. Just have to get the electronics.
The small gasket was also one mm to thick, so will fix that.








I got some 2mm acrylic glass, so I'll try cutting that tomorrow.

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 4 weeks ago

Yes. I can absolutely do a writeup when its done.

I wil have to wait for the sensors to arrive first. (10 - 35 days from China). Just in case I have to change anything to make the sensors work.
I wil post the printed body in about 4 hours. I have printed the bottom and middle, and the top is 50% done.
I wisited my 3d printing store and got a 10meter sample of TPU that I will try to print the newly designed gaskets in.
Hopefully it will work, but TPU is listed as 'Expert' in the dificulty level, so no guaranties :)

Heres the drawings of the gaskets for now.
Not a hwole lot to look at, but I made the area a little smaller than the slots they go into, and made them one layerline taller so they will get squshed and water proof when everything is screwed together (hopefully).



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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 4 weeks ago

So in V1 there is no counter sunk holes for screws on the bottom part.
The mounting position for the sensors between the bottom and middle part is raised to make more room and less likely for rain to blow in when it's windy.
The top part has doubble walls for the screws and with narrower holes, so wood screws can get a better hold.
I also changed to 4x50mm screws.

On the top part I added a indent to hold a 95x95x2mm acrylic plate with room for a gasket around the edge and around the holes for 4x15mm screws.
Then a second 62x62x4mm indent to hold the solar cells and IR sensor, with some more indents to route the wires. Ending with a hole down to the arduino compartement.

I printed the bottom part and am printing the middle part. They look to be printing well. The top part will be a longer print thoug.






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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 4 weeks ago

I have printed the bottom part, and I am printing the middle. I also completed v1 of the design, so the top part now has room for temp and sun sensor + acrylic glass.

I will also design some gaskets to be printed i flexible material.

Ill post some pictures when im back home.

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 1 month ago

So here is the first brainstorm of the meteostation 3d printable housing.

Its 10x10x9.75 cm

The bottom part is just to keep direct rain out when its windy.
The middle part holds the sensors in the middle, slightly raised so rain wont hit them. With two holes for the wires.
The top part has a 43x43x20mm compartement for the arduino and wifi and a slanted roof for the IR sensor and Solar panel. ( I will have to make some room for mounting it with the acrylic glass covering it. )
Between the top and middle part there is room for a gasget to keep thing dry inside, and there are holes trough all the parts for 4x 50x3mm screws to hold it togheter.

Only a sketch for now, but the parts should be easily printable.






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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 1 month ago

Thats looking real nice, and very cleanly designed :)

I'm happy with the first season of mine. Has been bone dry all winter.
Only issues is the few things ceeping me from reaching automation.

1. no weather (Working on it)
2. Orion SSAG only calibrates if I disable two axies (It does however guide well after a minute or so)
3. If mount fails to park but driver reports parked, roof collition. (Ill ad some micro switches)
4. Due to my parking position I have set Celestron avx to 'prefer west' in meridian settings, and not to track past meridian. So I'm sure it parks on the correct side. (Will have to look into that. might be that I can find other settings that work)

So i have somethings to do this summer,

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 1 month ago

I edited, did it mess up your post?

I can order one extra and check it out, they were not to expencive.

How is pico obsy 2.0 coming along? I have not seen any updates on SGL lately.

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Magnus replied to the topic 'Building the induino MeteoStation with 3d printed housing' in the forum. 1 month ago

Thanks. that toy was cheap, so nice that it works.

One more thing. It says on the MeteoStation page that it supports two external temperature sensors.
Do you know if they are averaged out, or if it will show the temperature for each? Would be nice to keep one inside the obsy, so I can have historical graphs of the inside temp.

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Magnus created a new topic ' Building the induino MeteoStation with 3d printed housing' in the forum. 1 month ago

Hi.

To try to reach automation in my observatory before astronomical darkness returns (Aug 22th) I want to build the meteostation indiduino.wordpress.com/2013/02/02/meteostation/

By looking at the info I have some questions about the hardware used. The links in the description is of old out of stock products.

So this is the list I have come up with so far.

  1. Arduino (Pro Micro Arduino www.kjell.com/no/produkter/elektro-og-ve...tDetailedInformation
  2. WiFi module www.kjell.com/no/produkter/elektro-og-ve...no-esp8266-14-p90745
  3. Barometric pressure sensor BMP180 looks to have replaced BMP085 www.ebay.com/itm/BMP180-Replace-BMP085-D...c:g:sosAAOxyIv5Tkxst
  4. DHT22 AM2302 Humidity sensor www.ebay.com/itm/New-DHT22-Digital-AM230...1:g:Py0AAOSwbqpTsn6M
  5. MLX90614 IR temperature sensor www.ebay.com/itm/1PCS-MLX90614ESF-BAA-ML...0:g:Hf0AAOSwWntXMzI1
  6. Cheapest solar powered LED light for daylight sensor www.clasohlson.com/no/Glasskrukke-med-so...ebelysning/36-6482-3
  7. Acryllic sheat www.clasohlson.com/no/Akrylplast/Pr341360000

If these hw selections wil work I still wonder where to mount the sensors.

I plan on mounting the IR temp sensor and the solar cell on top behind a sheat of acrylic glass.
Then have the Arduion with the WiFi module inside of the housing.
For the Barometer and humidity sensor I will mount them inside the housing to keep them dry, but have vents so they are exposed to the outside air. They will be mounted in their own compartement so they will not be affected by the heat of the arduino.

As I understand it, the humidity sensor should not be exposed to rain?

Also in the text it is mentioned that MeteoStation supports two external temperature sensors, but it does not say what sensors are used for mesuring ambient temp, is the DHT22 used for this too?

Hope someone has a little more experience with this, and can give me some tips.
I will design the housing when I know what to make :)

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