Diy 5V Solenoid

I need a 5V solenoid for my project a my whole will work on 5V but i can't find one locally and online was deliverable to my location so i choose the diy option. The solenoid consumes about 150mA at 5V as it shoots my requirement,

and 150mA at 5V don't make a reasonable strong magnetic field, so don't expect a super strong solenoid.

• Scrap pieces of Plastic
• Coated Copper wire
• Small neodymium magnets
• Super glue

First cut the empty pen pipe to desired length (mine around 2cm) , must be hollow inside and then cut the end caps (see the pic) , and by the way there is nothing wrong in pic its just upside down smile. Then make that, 2nd pic contraption and wind the copper wire, more the winding the better it is.I wind around 15 meter of wire and got around 32 ohm of resistor b/w the ends.

Wrap the winding with any short of tape for protection and aesthetics.

I can't say the thickness of wire, i bought a long time ago for diff project and don't have anything to measure it neither any other ref value.

For the center part i used half metal and other half with non ferromagnetic wooden stick, and at lower part glued the magnet to give more actuating force and adds little weight to bottom of it for returning, as i don't have any weak enough spring that can be used for retraction.

Attach every thing together and boom you have working solenoid, its pretty customizable and can be easily modified to match your needs.

Edit: I finally made a project to use this solenoid, can it out here.