86Views7Replies

Author Options:

Seeking electronics help for fun project Answered

Hi

i'm searching for someone why could help me put together a prototype.... An electric motor needs to turn on/off intermittently (randomly) in order to slide a small piece of cardboard a couple of millimetres in one direction for up to 2cm, then reverse direction and come back (then reverse again).

i have some sketches which might make things a bit clearer!

if this is something you could help me with then please get in touch.

Thanks
Julius

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
mpilchfamily
mpilchfamily

7 years ago

No need to post a question in more than one section. Which one do you want to follow? This one or the one you started in the Burning Questions section?

Also how much weight does this have to move?

0
julius100
julius100

Reply 7 years ago

thanks for the reply. I'll stick to this thread as I got 2 replies!

weight is minimal. It would be the weight of approx a business card. It needs to move/ slide horizontally in 2-3mmm bursts in one direction for up to 2cm, then change direction and come back, and so on.

initially I was thinking of using an electric motor to turn a larger wheel connected to an axle which pushes/ pulls the card to and fro. However if a servo is inexpensive and can be made to move in/ out in small steps then this is an option.

Shall I send you some sketches?

0
mpilchfamily
mpilchfamily

Reply 7 years ago

A servo will only cost about $20. The armature on the servo will allow you to use something like a paperclip to attach it to the item in question. Then when the servo moves the item in question can slide back and forth along a groove. So an Arduino running a simple sketch can make it all happen without the need for any additional hardware. Start researching the arduino and how to control a servo with it.

0
julius100
julius100

Reply 7 years ago

so servo's aren't particlarly cheap then!?

back to the electric motor then...

0
mpilchfamily
mpilchfamily

Reply 7 years ago

Overall they will be cheaper than a basic motor and easier to control. A servo can be connected directly to the Arduino. A regular motor requires more current and will need a driver between it and the Arduino. You probably need to gear down the motor to get the control you need. A gear head motor will cost nearly $20 on it's own. Then you have the extra cost of the driver. If you need precision then a servo is the way to go here. When you cut power to the servo it stops where it's at. When you cut power to a regular motor it spins a bit more before stopping.

Here is a servo for less that $10. http://www.ebay.com/itm/like/290868277806?lpid=82

0
julius100
julius100

Reply 7 years ago

Hello

Thanks for your advise - I've ordered a small cheap servo and will have a play. This is ultimately a kids toy so I'm trying to keep the costs as low as possible.

I looked at arduino kits and not sure if I want to start on that learning curve. Do you know of anyone that would put together a small controller that would randomly trigger the servo to move. Even better if it could be triggered by movement or sound! Happy to pay costs and a slice of the enormous worldwide sales revenue!!!
Cheers
J

0
Josehf Murchison
Josehf Murchison

7 years ago

Sounds like a simple full bridge or half bridge circuit. (Some SA used the term H bridge a couple years ago but for 40 years it was Full Bridge.)

Joe