"Flip-it” new build/project

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Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sun Feb 25, 2018 9:46 am

Week One- Awesome!

25 students into 6 groups. Lots of planning and cutting out of card. The next week will be a challenge for them as they figure out how to add a weapon to their robots.

Unfortunately I cannot upload pictures due to safeguarding laws. However I will take some pictures of their robots next week.


House robot no3 is in the post. All parts ordered.

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Thu Mar 01, 2018 10:20 am

SNOW DAY!! Some free time to do some building.

DRAX Power is in process of being built.

3D printed by a member on this website. Thanks MarkR.

It will drive both ways up and hopefully will have some awesome pushing power with 4WD.

Still waiting on 4 motors. From China 🙈. Could be a while...

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Also a picture of a few of the pupils robots. Some have started to add on the armour.

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peterwaller
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Re: "Flip-it” new build/project

Post by peterwaller » Thu Mar 01, 2018 4:46 pm

Looks like you are making great progress.
One thing to watch out for in the four wheel drive is that with so little of the wheels sticking through the chassis and them being inset form the front and back the opponent only need to lift one end slightly before all the wheels are off the ground.

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Thu Mar 01, 2018 5:18 pm

Did not think of that!

I think the shape of the chassis will definatly need a redesign at some stage. Possibly have the fronts of the wheels stick out so they will have access to the floor whatever angle the robot is lifted to. Looking forward to developing it.

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sun Mar 18, 2018 10:25 am

After being horribly distracted by a £5 Arduino starter kit from hobbyking reduced from £25 in the sale. What a bargain!!!

I built a robot with the Arduino that reads PWM from my Tx/RX and converts it a pwm readable by a H-bridge to drive motors. Many hours of programming later it works!!!

Next stage is build it without all the giant wires and 1 battery pack to be small enough to fit in a antweight. That way I can control it with a ps3 controller or a simple joystick module. Thus reducing the price of building an antweight down to just £15-20.
Hopefully growing my club from 6 to 10 robots with a small amount of funding...

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Anyway... my motors finaly arrived!! Yay!

Hopefully finish DRAX POWER today...hopefully...

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Oh and here’s an awesome looking weapon one of my students made.

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Fulford
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Re: "Flip-it” new build/project

Post by Fulford » Sun Mar 18, 2018 4:28 pm

That weapon looks like its either gonna do major damage or pull an apex. Either way it looks fun. Have you built a battle box for the kids to fight in?
First ant under construction :o

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sun Mar 18, 2018 6:10 pm

Not really a battle box. More like what you find inside the battle box but without the protective polycarbonate. I posted a picture of it somewhere.

It’s made from some sort of solid cardboard. So I will probably do an apex. However I’m sure it will be fun to see some sort of damage happening.


I finished my 3rd house robot. Ramming bot called DRAX POWER.

Build:

155g (need to drill some speed holes. The motor mounts are 100% infill. If I drill a nice hole into each Drop some weight also.)
2x tiny esc
1 x hobbyking micro bec(tiny esc couldn’t handle the current pull from RX)
4x n20 300rpm motors
1x FingerTech switch
1x 3s 180mah lipo
3D printed armour and 1mm polycarbonate lid.(thanks Mark for printing)

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Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Thu Apr 05, 2018 12:07 pm

During the holiday I decided instead of building another robot(built 3 and non have made it to a competition yet.) I’d start building stuff for the arena.

I thought I’d try to make the arena more interactive for the students. Having a visual timer for the students to view and some sounds to count down to the start of the battle just like on the tele.

Here is a video of what I have come up with so far.

https://youtu.be/UV8U7CIkPSY

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MarkR
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Re: "Flip-it” new build/project

Post by MarkR » Thu Apr 05, 2018 7:54 pm

Nice bot, Drax Power, a box on wheels.

I hope the black fits the aesthetic you had in mind, it's the PLA that I happened to have handy!
Robot: Betsie - RaspberryPi controlled flipper bot with gyro stablisation - too clever for her own good?

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Fri Apr 13, 2018 9:42 am

Indeeed Mark . At some point I was going to stick some vinyl on it with Red letters saying POWER!!! I've just been far to busy with work.

It's worked out pretty well, fitting it all together was simple. However, as peter pointed out. If some one scoops me up. It loses all pushing power. So maybe a redesign of a small lip around the bottom edges to stop this from happening.

The first Robot wars championships went down on Tuesday. Here is a picture of all their creations. My y7 students found it very difficult to build a working weapon. A lot of them broke mid fights. Was fun to see a flipper arm falling off though.

My next lot of students are y9s so maybe we will seee a full set of weapon wielding robots.

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Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sat Apr 21, 2018 10:59 am

After many hours of coding... anger...more coding... it has finaly all come together.

I’ve made a cheap and simple controller using an arduino. This has all been done before by other people around the world.

However their coding was over complicated and in some cases had issues with delays and unresponsive controller movements. Also most people used shop bought RC transmitters that can communicate with an arduino. In this case I am using an analog stick from a ps2 controller.

Now I’ve got the prototype working my next stage is to condense the wires and boards into a nice neat stack which could slot into a robot.

The whole purpose of this project is to reduce costs. So I can use the tiny after school club budget I have to build as many robots as possible.

Items used:

2 x Arduino Pro mini. £3.20
2x NRF24L01 and 3.3v adaptor board. £4
1x L9110S H-Bridge 44p
1x analog stick 75p

Total = £8.39

This build combines Transmitter, reciever and ESC into one package. For only £8.39!!!! Bargain.

I’ll put a github of my code up at some point. Let me know if you are interested in seeing it.

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It’s seems like a lot of batteries however once wires are spliced it will only need 1 battery per arduino. The H-bridge was drawing to much amperage through the arduino so I just added a second battery to keep it simple. Really I could of used the breadboard to split the voltage....

That’s one white knee... need to get out the house more 🤣

Fulford
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Re: "Flip-it” new build/project

Post by Fulford » Sat Apr 21, 2018 2:40 pm

This seems like a really neat solution, as someone who know nothing about programing will it be possible for you to add a weapon control to this set up?
First ant under construction :o

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sat Apr 21, 2018 3:25 pm

Fulford wrote:
Sat Apr 21, 2018 2:40 pm
This seems like a really neat solution, as someone who know nothing about programing will it be possible for you to add a weapon control to this set up?
Yes, you could either use the button built into the analog joystick. Pushing in the joystick, It was a function in ps2 controllers that I don’t think anyone used. Or you could add a separate button to act as a switch to turn a spinner weapon on/off or activate a flipper. It’s more simple to add a button then programming the mixing for the analog stick.

The tricky issue that I will have to tackle is adding a failsafe into the system, to allow usage at AWS. I’m sure it’s possible as commercial Tx have them.

I’m planning on 3D printing a controller to mount buttons,joystick and battery pack on to.

Fulford
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Re: "Flip-it” new build/project

Post by Fulford » Sat Apr 21, 2018 6:06 pm

That makes sense, although I could see using the analog stick button to be a bit of a pain.

The 3d printed mount sounds like a good idea, will you add any other buttons to that?

Your kids are really lucky to have you putting in all this work for them!
First ant under construction :o

Paulmchurd
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Re: "Flip-it” new build/project

Post by Paulmchurd » Sat Apr 28, 2018 4:08 pm

Thanks Fulford. It’s fun for me and hopefully even more fun for them.

I now have my arduino “blob” working. Weighs in at 12g.

My code seems to get confused with its self when changing direction there will be a half second pause where it stops then changes direction. This seems to happen only with the NRF24L01 module and not my shop bought TX/RX this doesn’t happen.

Maybe I need to do less transmissions from the joystick a second? I’ll test it later.

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I’m still using two batteries but will switch over to 1eventually as I soldered the VCC input instead of the RAW power line. Messing around with electronics takes a surprisingly long time....

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