Yet another new guy!

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Smillard
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Joined: Tue Jan 02, 2018 6:11 pm

Yet another new guy!

Post by Smillard » Sun Feb 18, 2018 4:20 pm

Hi all,

Another new guy attempting a build but falling down!

After a few cardboard designs (and 2 polycarb bases) i finally have a driveable bot. The next step is the flipper and ive come up against a brick wall i just cant get over!

When i power on, the servo moves. (Video link below)
Ive tried lot of things ive read online like binding with the stick in different positions and i cant get it to not move. Is it even possible? Do i just have to work round this?

https://youtu.be/gaKrifVIJIg

Any help or advice would be apreciated as im making this up as i go along!

Regards
Simon

Dazmund
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Re: Yet another new guy!

Post by Dazmund » Sun Feb 18, 2018 5:36 pm

So it moves up when you switch it on? First off, check if the channel it's connected to is set to zero. For instance, mine is connected to the throttle as I'm using the NanoTwo, and the left stick is all the way down. If it is, you have to unscrew the plastic horn from the servo and then position it to the lower angle you want. I myself am a noob and just found that out.

Smillard
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Re: Yet another new guy!

Post by Smillard » Sun Feb 18, 2018 6:26 pm

Im using the nanotwo too. My left stick is spring loaded so auto centres.

Do you think thats the problem? The 0 on my stick is 50% for the servo?!

voorsk
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Re: Yet another new guy!

Post by voorsk » Sun Feb 18, 2018 6:49 pm

well, I'm a noob with a different servo, different esc, and a different tx/rc. plus i don't know why it moves, so I'm unlikely to shed any light.. :P

my servo moves twice; once on powering up, to a random anticlockwise position, then again when the tx is turned on, to a set position. it's always the same position, which matches the tx settings.

i do worry that the slight random movement will cause an issue, but i haven't got as far as attaching it yet, so can't really say.

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BeligerAnt
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Re: Yet another new guy!

Post by BeligerAnt » Sun Feb 18, 2018 10:10 pm

voorsk wrote:
Sun Feb 18, 2018 6:49 pm
my servo moves twice; once on powering up, to a random anticlockwise position, then again when the tx is turned on, to a set position. it's always the same position, which matches the tx settings.
Always power the transmitter on first! If you don't the receiver only receives noise and any random signals that are floating around. It might manage to make some "sense" out of the mess and move the servo, motors or anything else to any random position.
This isn't so much of an issue with a 150g robot, but if you ever move onto anything larger you really do want to make sure it's under your control at all times!

If the transmitter is powered on first then when the robot is switched on the servo should go to wherever the transmitter is telling it to. If the stick is centred the servo will go to mid-travel, if the stick is at one end then the servo will go fully clockwise or anticlockwise.
Gary, Team BeligerAnt

Dazmund
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Re: Yet another new guy!

Post by Dazmund » Mon Feb 19, 2018 12:07 am

Smillard wrote:
Sun Feb 18, 2018 6:26 pm
Do you think thats the problem? The 0 on my stick is 50% for the servo?!
Exactly. Also, BeligerAnt is right about turning on the transmitter on before the robot is switched on/plugged in, hence the sudden servo movement.

By the way, when I mentioned the left stick being all the way to 0, I meant -100%. My Devo 7e's left throttle stick is not spring loaded into getting centred up, so that's my only point of reference.

Smillard
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Re: Yet another new guy!

Post by Smillard » Mon Feb 19, 2018 8:47 am

Thanks guys, all makes sense!

I have read a couple of guides online witj regard to removing the spring from the left stick. That should cure my problem and give a better rage of movement in the servo. From -100% to +100%

voorsk
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Location: Stockport, UK

Re: Yet another new guy!

Post by voorsk » Mon Feb 19, 2018 9:16 am

Thanks from me, also. For some reason, I never thought to turn the transmitter on first. d'oh! :oops:

Smillard
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Re: Yet another new guy!

Post by Smillard » Thu Mar 01, 2018 7:26 pm

so time for my second round of questioning! im now about 75% through my build. i have actually made something that drives (the driver needs more practice!), flips and self rights

the next thing im looking at is the speed of my flipper. i have the 306g-HV servo (link further down) and the Nano2

the stats for the servo are:
Operating Voltage: 4.8V / 6V / 7.2V
Operating Speed: 0.07sec.60º/ 0.06sec.60º/ 0.05sec.60º

i understand the Nano2 is 5v at the servo plug, so can i cut the live to the servo and splice into the power before the nano2 giving me 7.2v plus the added speed?

(https://hobbyking.com/en_us/turnigytm-t ... tore=en_us)


i might have this wrong and explained it really badly but any help appreciated!!

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GeorgeR
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Re: Yet another new guy!

Post by GeorgeR » Thu Mar 01, 2018 7:36 pm

Yep, you've got that exactly right, disconnect the red wire from the servo plug and attach it to the red wire going into the NanoTwo from the battery. You'll get a much better flip that way.
Team Zero
Zero - rambot - - Axiom - axebot - - Valkyrie - drum spinner
Vampire - horizontal spinner - - Orion - horizontal spinner walker

Smillard
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Re: Yet another new guy!

Post by Smillard » Fri Mar 02, 2018 4:16 pm

thanks GeorgeR!

it made sense in my head but always good to check these things when your new to it before you start cutting away!

Smillard
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Re: Yet another new guy!

Post by Smillard » Mon Mar 12, 2018 8:45 pm

So we are 5 days away from the bots seeing some action. Only 1 thing left before im done ready for you guys to tear it to pieces....

... I want to attach a rubber band to the flipper to help it close. How do you attach it? Hot glue? Tape? Super glue?

I dont know what will be strong enough to hold but without being excessive?!

Thanks in advance (again!)

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MarkR
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Re: Yet another new guy!

Post by MarkR » Tue Mar 13, 2018 10:06 am

Miniature cable ties?

I'd drill a couple of small holes in the flipper lid and fit a tiny cable tie (wire wrap might do too)

If it's polycarbonate or similar, glue seems unlikely to stay stuck for long, especially hot-glue.

Mark

Smillard
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Re: Yet another new guy!

Post by Smillard » Wed Mar 14, 2018 8:31 pm

So im all build ready for you guys to destroy on Saturday.

very crude but does the job. it drives, flips and self rights.

made some spares so hopefully i last they day then back home to start of REPPILF MKII. i have already designed out most of the "faults" i came across in the build so i guess ive got the bug!!!

not sure if the picture will work but...

Image

Fulford
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Re: Yet another new guy!

Post by Fulford » Thu Mar 15, 2018 10:31 am

Looks really nice. I need to hurry up and finish mine.
First ant under construction :o

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