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Seite: technics-robots-R6-construction_ge.htm
Datum: 2017.09.13 17:10:41 (UTC+1)
Name: christian
Kommentar:
Die Spannungsversorgung der Lade-Elektronik könnte man ja dann mit zwei Kabeln realisieren, an denen enden sich jeweils ein Europäischer -bzw. Amerikanischer Stecker befindet.
Aus Sicherheitsgründen könnte man ja dann über einen Schalter zwischen beiden Steckern wählen.
Wie wollen Sie das Roboterfahrzeug an das Internet binden? Über einen mobilen WLAN-Hotspot eines Smartphones?
Me: Wie im vorherigen Kommentar geschrieben, ist das Problem mit den unterschiedlichen Steckern und Spannungen mit dem USB-Ladegerät elegant beseitigt.
Angebunden wird der Rover über das integrierte WLAN des Raspberry Pi 3. Dazu muss ein Accesspoint (z.B. ein Smartphone im Accesspoint-Modus oder ein WLAN Router) als Gegenstelle vorhanden sein.
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2017.09.13 16:49:48 (UTC+1)
Name: christian
Kommentar:
Tolles und interessantes Projekt!:)
Ist der Roboter wassergeschützt (hält er auch stärkerem Regen proplemlos stand)?
Ich finde das dies schon sehr wichtig wäre.(wahrscheinlich Überflüssig :))
Eine größere Akkukapazität und evtl. eine PV-Zelle wie bei R5 wären ebenfalls eine sehr gute implementierung.
Wenn du den Rover rund um die Welt schicken möchtest, dann wäre ja ein integriertes Lade-Netzteil, welches mit einer Wechselspannung von 100-250V und 50-60Hz arbeiten kann, sehr von Vorteil.
Me: Danke für das Kompliment und die Anregungen!
Die Komponenten sind zumindest Spritzwassergeschützt. Voll versiegelt sind auch die Motoren des WLtoys nicht. Ob das Fahrzeug Regen standhält, werden Erprobungen zeigen.
Mehr Akkukapazität bedeutet mehr Gewicht und mit der Aufrüstung sind die Motörchen des Fahrzeugs schon voll gefordert. Die PV-Zelle an R5 ist mehr Deko - um damit die Batterien zu laden, müsste der Rover 24h in der prallen Sonne stehen...
Integriertes Ladegerät würde ebenfalls das Gewicht zu sehr anheben. Das von mir verwendete Ladegerät kann an die USB-Buchse angeschlossen werden und ist somit universell genug für eine Weltreise.
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2016.12.11 00:59:33 (UTC+1)
Name: 嵐山夏礼音
Kommentar:
Ich schlage für das Chassis eine Aufhängung der Motoren vor. Diese kann mit Gummibändern realisiert werden, um die Wartung und Reparatur maximal einfach zu gestalten. Allerdings müssen die Motoren weiterhin noch vor Dreck, Staub, Sand etc geschützt werden, da diese in meiner Vorstellung komplett frei liegen. Meine nächste Idee ist ein technisch komplexerer, aber doch wesentlich komfortabler Kettenantrieb. So lassen sich sowohl die Motoren nach innen planen, als auch eine stabile Federung.
Me: wie du bereits geschrieben hast, sind komplett frei liegende Motoren anfällig für Schmutz und Feuchtigkeit. Einen Kettenantrieb will ich auch nicht ausschließen, da R6 voraussichtlich deutlich kleiner als R5 werden wird, um die Portokosten gering zu halten. Mit Kettenantrieb wäre dennoch eine akzeptable Geländegängigkeit gegeben. Gibt's Bilder zu deinen Fahzeugen?
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2016.06.23 17:54:14 (UTC+1)
Name: CutterSlade
Kommentar:
Well, the things you get on Aliexpress are typically proven thousands of times just sold there separately to individuals rather than big companies. Of course you could build your own charger with an Arduino and a transistor, there are open source chargers like that. The power supplies I mentioned are almost always multi voltage and double isolated. They are pretty safe and again proven thousands of times. If you want a safer/expens. compromise, use LiFePo 4 batteries. HobbyKing is a good source.
Me: The quality check is often skipped when selling to individuals - replacing for free after failure is the kind of guarantee - nothing for a robot being far from home...
Yes, I know that many of the chargers come with an adapter for many wall outlets. Well, let's see if the budget allows buying LiFePo 4 batteries ;-)
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2016.06.23 17:07:15 (UTC+1)
Name: CutterSlade
Kommentar:
I think having suspension will solve more problems than it creates. It lowers local mechanical stresses on the motors and gearbox and it helps to ensure that all the other components, especially moving ones, like the camera/servos don't shake loose. Also the picture quality during moves will be a lot better. Maybe use a very leave spring that's integrated into the bottom frame. Maybe mount the wheel/axle/gearbox assembly on a flexible piece of sheet metal.
http://www.thingiverse.com/thing:15574
Me: That thing doesn't exist on Thingiverse...
The rover is slow, thus it doesn't shake noticeably. It's just moving up and down, following the surface of the terrain smoothly. Nothing loosens even without suspension.
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2016.06.23 16:51:49 (UTC+1)
Name: CutterSlade
Kommentar:
LiPo chargers are probably more common now than Pb chargers. Also you could use a complete BMS (salvage from a laptop battery pack or search for 3S LiPo BMS on aliexpress.com) into the bot and the only thing one would need to do is plugging it into a wall socket. I use this (http://www.hobbyking.com/hobbyking/store/__41730__Turnigy_12v_2_3S_Basic_Balance_Charger_EU_Warehouse_.html) for power tools I converted to LiPo batteries. All you need is an old power supply for old external hard drives.
Me: LiPos and chargers from Aliexpress, well that doesn't sound like a good combination - I don't want to loose the robot in a fire ;-)
Quality batteries and quality chargers are needed.
Remember that it will be pluged to 230V or 110V or what ever voltage is in the wall outlets of this planet.
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Seite: technics-robots-R6-construction_ge.htm
Datum: 2016.06.23 16:38:36 (UTC+1)
Name: CutterSlade
Kommentar:
I suggest a diffusor for the LEDs to make lighting more even and so help the camera so set the exposure better. I also suggest to lower the middle axle and give all wheels some sort of suspension. This will make turning much easier on the motors. These gearboxes will destroy themselves pretty quickly. I would put the gearbox completely inside the robot and use brushless motors. If one of those geared motors fails it will brake the bot pretty hard. Build the gearbox from belts and pulleys.
Me: Yes, Light and cameras are a tricky to handle. Test runs at night will follow.
Suspension means more moving parts means a higher failure rate. At low speeds, suspension isn't that big improvement (it's more like a tank).
Brushless motors are already on the list of improvements. High torque versions with less gear ratio - belts and pulleys are a good hint.
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Page: technics-robots-R6-construction_en.htm
Date: 2016.06.13 22:37:55 (UTC+1)
Name: WOLFMANN
Comment:
I would use the new Raspberry Pi 3.Some businesses have them for as low as $35 dollars. You can pick up Li-Po batteries on Ebay for next to nothing. You can buy buy brush-less motors on Banggood.com and HobbyKing.com for a very reasonable price. Both are international companies with warehouses in several countries. Jamesco.com had planetary geared motors that are very reasonable. I would use tracks because that have better terrain handling capabilities
Me: Same as R5, the prototype of the world explorer, R6 will verry likely compute with a Raspberry Pi.
Li-Po batteries are tricky to handle and easily catch fire if charged with wrong voltages, same is in case the build quality is poor. There are more reasons (e.g. capacity over time) why buying cheap batteries is usually no good idea.
Where to buy components? Well let's see - there are countless companies on the market...
Wheels are more easy to build, more fail-save and a good compromise for in- and outdoor missions, but tracks are indeed a good choice for outdoor operations. I have noticed your vote.
Many thanks for your feedback!
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Page: technics-robots-R6-construction_en.htm
Date: 2016.06.11 10:04:29 (UTC+1)
Name: Dusseldorf Doug
Comment:
Some thoughts for R6:
- Camera mount on a servo, we need the ability to change the view from left-right (in addition to up down)
- Motion capture on the video feed, to detect lifeforms approaching the rover, store 10 second bursts when motion is detected
- microphone - its another sensor! speaker - talk to lifeforms.
- Headlights
- Good data storage is necessary, storing video, sensor readings, rover health, etc
Questions:
- what are you spec'ing for run-time between charges. ie battery cycle?
Me: Thanks for sharing your thoughts!
- I am thinking of an additional camera on top of the rover that can turn 360 degrees.
- Motion capture will be difficult to implement, since the robot will move along it's mission targets.
- A microphone it indeed a simple but interesting sensor. Speaker? Why not.
- Headlights are implemented, better ones would in fact improve the camera quality.
- Most of the data will be streamed to a server and made public.
With the (old) lead acid batteries of the prototype the run time is 2.5h. Less than that would be a pain. 5h should be possible.
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Page: technics-robots-R6-construction_en.htm
Date: 2016.06.08 15:12:54 (UTC+1)
Name: Steve Richards
Comment:
Add an IR range finder such as http://www.sharp-world.com/products/device/lineup/data/pdf/datasheet/gp2y0a21yk_e.pdf
Attached to a pan and tilt mechanism can be used as a kind of poor man's LIDAR - to build a 3D model of the environment the robot is travelling in.
Me: Yes, something like that has to be added. I thought of Ultrasonic transducers, but the IR range finder is definitely an option (if it works properly under bright daylight conditions). Thanks for sharing your idea!