Need Help with dc motor bidirectional controller circuit.

Hello all i need some help with driving 3 dc motors bidirectional with pots. Im looking at something like this that i can make that will drive 3 motors with 3 pots not just 1 here are the motors and im going for torque not speed. Thank You

Asked by skullkeeper80 6 years ago


How to control 100 bidirectional DC motors?

Hi,  I'm trying to control 100 DC motors using a microcontroller (Arduino Mega) The motors run on 1.5V and have a operational current of 40mA. 1) Each motor must be able to rotate clockwise and counter clockwise 2) The motors must be able to move independently     (though direction of the motors at any one time will be the same)      eg. at time = 0; motor 1,20, 30, 45 will rotate CW            at time = 10; motor 20, 35, 80 will rotate CCW 3) Using minimum amount of pins from the Arduino (Shift Register ?) How should i go about doing this ? I have tried using L293D H-Bridge, but in order to control 100 motors,  i will need 50 H-Bridges and 200 digital output pins I'm thinking of a simpler circuitry (image attached) to control the motors. Digital output pins from the Arduino will contol the relay switches, and the DPDT relay will change the polarity of the the voltage supply. Will this work ?  Are there any smaller alternatives to the mechanical relay (transistor ?)  Can a transistor allow current flow in both directions ? I would really appreciate if you could provide some inputs and ideas as to how you would go about controlling a large amount of motors. Cheers!

Asked by fujiapple 3 years ago


How would I make a bidirectional hand pump like an air mattress pump?

I'm looking for a resistance machine like a pneumatic  air mattress pump; two types. One pump could handle maybe 120 pounds pressure. The other would be for about 80 pounds.

Asked by Peter1001 4 years ago



Unable to reverse direction of servo using arduino

I have arduino and a perfect code for moving servo to bidirection, but now i have facing problem of reversing the servo. I have replace three servos but having same problem. please help to detect is there is error in my arduino or servos?

Asked by akshaydodkade 1 year ago


accesorame .instructables? Answered

Hi, how are you, my questions will not be used even this pcb design programMy question is could you join schematic to make a single one when being printed on the plate my project is a bidirectional speed control of 2 motors and add a more potecimetro and joystick, Control of 2 motors accesorame .instructables

Asked by FranciscoV82 8 months ago


How to build a smart home for a recreation vehicle(RV)

There are already a bunch of projects doing similar things for houses but non for RV homes. I would like to communicate with my camper RV motor home and trying to understand and learn ways to do this. Here are some thought of requirements: - Data like temperatures, rain sensor, burglarizing alarm and a few webcams - Google App engine and Google GCM for the storage and bidirectional communication. - The RV API can let any device have bidirectional coms My thought is to us info from other HOUSE projects and do a mash-up to fit an RV, example: (thanks to Nikus at instructables) "Smart home with arduino" https://www.instructables.com/id/Smart-home-with-arduino/ The HOUSE in this project has a static ip no problem with coms but what about an RV? There are a number of questions like I think the RV will have problem with a static IP or maybe not any ides on this would be grate? Why do most project use the Arduion over the Raspberry pie what would be most suitable for my project? If anybody here have done this or want to contribute with knowledge it would be a grate

Posted by erikswed 1 year ago


What would be a suitable serial protocol? Answered

I'm currently working on programming a serial interface to put onto I/O devices (number pad, LCD, sensors, secondary microcontroller...) in order to reduce the amount of I/O pins and external connections needed. The only requirements are that it needs to use only two wires (excluding power), and it needs to be bidirectional. Ideally, I'd like to avoid anything that needs too much processing of data before transmission (like adding extra bits to prevent a string of '1's from setting off the error protection). Hopefully, this project will end up as an instructable at some point, so what would be a suitable protocol that would be compatible with common microcontrollers? Thanks in advance.

Asked by The Skinnerz 5 years ago


Does anyone know anything about this typewriter interface?

The typewriter is an AEG Olympia ES-95i. It's a big beige electronic machine from maybe the late 70s or early 80s.On the back there is a 20 pin rectangular male connector with 2 rows of 10 pins. If I connect random pins with something metal, it types various characters. I'm wondering if anybody knows what kind of interface this thing might use so I can go about connecting it to my computer.EDIT1:I've found a bit more random information about this type of device which might help:http://www.atarimagazines.com/creative/v9n6/133_Praxis_makes_perfect_Oli.phpApparently Olympia made another typewriter in the same line that was basically the same as a bytewriter model. Irritatingly the article says the bytewrite provides no technical information "other than the pin-out assignments for the connector. "It would appear from the rest of the article that the connector might be some kind of modified centronics interface.I'll try to get a picture up soon.EDIT2:Here's the photo. Whatever it is I hope it turns out to be bidirectional so I can use this as a tty :).

Asked by pharoah 9 years ago