project design

Hi there, may i know how to stop something that is rotating, such as one holder precisely at one position that I want? Using stepper motor can works? how can be? And how to lift one magnet bar lever using solenoid by controlling microcontroller?

Thanks.

yes using stepper you can do it.. you need to know the step angle of your stepper.
I didn't get what you mean by "using solenoid by controlling microcontroller?"
Did you mean to say that you want to control the activation/deactivation of solenoid with the help of micro? if that is what you meant then you can do it.

hi ther, thanks for you reply. May I know in order to stop one holder that is rotating within 10 seconds or 20 seconds, isit posible to use stepper motor? if i wan to precisely know position of the holder that is rotating, may I know if I add sensor in between the stepper motor and the holder, isit ok? The power consumption in stepper motor is high? If have to lift up and down one magnetic bar lever, solenoid or stepper motor is more suitable to use?
thanks.

you need a motor with more torque.. so that you can easily lift the weight up... and yes power consumption will be high.

What holder you are talking about? have you made a layout of your basic design? so that i can understand the requirements in a better way. and the main motive of your project.. will be easy for me to understand as well as make u understand

HI ther, this is basic layout for the project. May I know how to control the rotation of the magnetic bar lever also? using solenoid or another stepper motor better? the photodiode and the LED is for sensor the position. Either one will be fixed in position, while another will be rotating according to the holder.

The basic function of this project is :
When switch is pressed, means on in microcontroller, the stepper motor will start rotating the LED and the holder and lift up the magnetic bar lever.

When switch is pressed to off the circuit, it should be back to this same position after rotating. Therefore, the stepper motor will be slower down to let the photodiode to sense the led light. When it sense that, means the holder is in correct position, therefore, it will stop completely. From your view, this sensing process takes how much time? And what control mechanism is suitable to control the lift up and down of the magnetic bar lever?

Hope you understand what iam talking about. Thanks.

except the concept of magnetic bar lever and holder.. i understood the basic function...

1. you want to keep the position of holder to a stable point either its off/on.
2. you have to lift something up..

Right now the point #1 is more important to you... as i feel which is the position of holder...
first i want to tell you that as you are using stepper motor so there can be many ways to align motor back to its position.. and the one you are using is also one of the ways to do it.
May i know what is the relation between holder and lever.. actually i am not able to imagine or think how this holder and lever looks like.. that the reason its taking time for me to understand..

and does the face of holder matter while positioning back..? i mean lets say.. holder is being rotated clockwise.. and while stopping it down.. or say while repositioning is it needed to rotate the holder in counter clockwise direction to reposition it? or just you need to stop it when both led and diode are in position... is holder a circular thing? if possible try to post a picture of holder and lever..

if the position of the face of holder matter while positioning back, how can detect the position is either face in or face out? Have to add more led and photodiode?

no.. then you can count the rotations or steps made by stepper motor.. so you can rotate it back to the same position where you have started..

hi rbk23 ..you can use the timer or limit switch to position either you can use rotary encoder for more compatible.. first you knows about the step angle and time for each. and calculate the torque and power required to lift your items and also you can calculate the time taken for up and down movement. all it made in simple programs. while using the timer.

hey rbk...
what is the use/application of the magnetic bar????/