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Topic: How to control hundreds stepper motors with one arduino uno? (Read 5852 times) previous topic - next topic

TomGeorge

Hi,

Quote
The lockers are meant for outside use, where there is no power supply.
Use solar PV, to keep a battery charged.
KISS, keep it simple etc etc etc.

Tom..... :)
Everything runs on smoke, let the smoke out, it stops running....

peefour

Thanks for your answer!

For some cases I can indeed use solar or elektricity from the grid, but in many cases not.
Especially in little portable lockers (suitcase-like), only batteries are possible.

Maybe I should open a new thread for this?

I found a little lock system on 3AA batteries, and inside it was a solenoid of type AKD0521 (Yaxin: Dual Latching Solenoid, Linear Push Pull Hold) or similar like AKD0521ZHK-0521 (Zonhen: Bi-direction / bi-stable keep solenoid).
This solenoid needs a reverse voltage for the opposite movement.

I opened such lock and removed the solenoid. I was amazed that I could not operate with a power supply of 5V-300mA, nor a power supply of 12V-170mA, but I had to use one of 12V-800mA before the solenoid moved.

But still it did work well on the device, and the 3 AA batteries had a lifespan of several months and in standby more than a year!

How is this possible? Did they use a circuit to increase the voltage? How can the solenoid suck so much current out of batteries, while it remained dead with power supply adapters less than 12V-800mA??

Thanks guys!!


I am baffled, anyone has an idea?

Isaac96

Do you still have the lock system? Measure the voltage between the terminals that the solenoid was connected to.
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peefour

thanks for your advise
no I do not have the original locking device, I dismantled it to see what motor drives it.
(Putting it back together is not an option either because I teared it appart )


CrossRoads

0) I want even to go futher then sleep mode, and use a key of the keypad to power up the whole circuit. The arduino should power off the itself and the whole circuit after unlocking the door. Is this feasable?

Yes. Circuit can be powered off even, and awakened with a button press.
All the devices can be powered off when in the locked position. Have a spring loaded door that is pushed open when the lock retracts, and the door have a tongue that can slide over the lock to push close (poor description, go look at any house door, it can close without turning the knob, yes?)

As to which takes more power to pull the lock arm out of the way, you'll have to experiment.
How far does it have to move? How durable does it need to be? How much does it have to resist being broken into? etc.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Isaac96

All the devices can be powered off when in the locked position. Have a spring loaded door that is pushed open when the lock retracts, and the door have a tongue that can slide over the lock to push close (poor description, go look at any house door, it can close without turning the knob, yes?)
Like a wedge, basically. Something like a diode(allows movement in but not out). Make sure you get the wedge in the right direction.
Do not PM me for help. I will delete immediately.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F


Isaac96

Any updates? Does it work? Have you gotten anywhere?
Do not PM me for help. I will delete immediately.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F

peefour

Hi Isaac,
Thanks for asking.

I have not yet decided what kind of motors to use.
I like to use solenoids as I see that it works well with an electronic padlock that I have.
I am trying to figuring out how they can supply the high current and voltage (12V/1A) that is required for this bistable holding solenoid. See my post #16 above.

I think that they use a square wave to feed a an inductor, who in its turn charges a big 4700µF capacitor. Ithink that the capacitor is then when discharged able to supply the high voltage and current for a short amount of time, but enough to drive the solenoid.

It seems to me quite cumbersome, and I don't want to use coils. Is there any other method to achieve the same?

Thanks!


peefour

Hi Isaac,
Thanks for asking.

I have not yet decided what kind of motors to use.
I like to use solenoids as I see that it works well with an electronic padlock that I have.
I am trying to figuring out how they can supply the high current and voltage (12V/1A) that is required for this bistable holding solenoid. See my post #16 above.

I think that they use a square wave to feed a an inductor, who in its turn charges a big 4700µF capacitor. Ithink that the capacitor is then when discharged able to supply the high voltage and current for a short amount of time, but enough to drive the solenoid.

It seems to me quite cumbersome, and I don't want to use coils. Is there any other method to achieve the same?

Thanks!


Isaac96

Do not PM me for help. I will delete immediately.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F

andyibanez

I think use servo motor is more usefull if just for locking

Easydriver Stepper is need 2 pin, step and dir (and gnd)

Uno is have 13 digital, 0 and 1 is tx tr,
Is just 12 pins, it mean 6 stepper only


Isaac96

There are I2C stepper controllers. And the Parallax Servo Controller is serial. It can control 16 servos.
Do not PM me for help. I will delete immediately.
CONNECT THE GROUNDS!

After Tuesday, even the calendar goes W T F

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