Simple project

Request a hack or modification here:

So, you need a new wheelchair control for your nephew, someone here can figure it it. Maybe you want ambient lighting for your car to match the music, we've probably got someone here who does that.

No illegal "hacking" requests allowed and we are not responsible for the activities of the users. If you make an arrangement with another user, it is between the two of you.

Simple project

Postby PaulMcGuinness » January 2nd, 2013, 11:56 am

Hi all,

I need someone to design a circuit and make a prototype for me.

THIS IS A PAID PROJECT - So please quote a cost or PM me.

I need a device that stops a letter-box flap from being opened until a signal (3-5vdc) is send for >100ms, at which point the flap is released for 10 secs. There should also be the option to hold it open indefinitely, and not to lock again until the flap returns to its normal position.

I have in mind the following:-

It should run on anything from 5 - 12vdc.
2 x Solenoid bars to hold the flap closed
Hall-effect or reed-switch to detect open position
Positive voltage on Pin 1 >100ms opens solenoids for 20secs.
Positive voltage on Pin 2 keeps solenoids open until voltage drops.
If pin 1 used, then the solenoids will not lock until 10 secs after flap closes.
Posts: 2
Joined: December 13th, 2012, 2:47 am

Re: Simple project

Postby Drake » January 15th, 2013, 11:43 am

Are you trying to prevent entry or just keep a draft out?
Posts: 78
Joined: February 8th, 2011, 10:44 pm

Return to Requests and commissions

Who is online

Users browsing this forum: No registered users and 2 guests