Control refers to systems that control other systems, whether that be industrial machinery, lighting or devices used in a home

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heat air with nichrome wire

108 rows of grapevines, each row 650 feet long. Suspend a nichrome enameled wire along each row in order to raise the temperature of the air within 18 inches of the wire 6 degrees Fahrenheit. What ...
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2answers
54 views

Arduino and several leds

Can an Arduino turn on multiple leds at the same time?. I want make a home made lamp with several less controlled with an Arduino UNO light sensor and i already have the light sensor, also i know how ...
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1answer
40 views

transfer function and error gain function

simulate this circuit – Schematic created using CircuitLab I know the difference between those two functions , but i want to see the relation between them , i think that the error gain ...
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4answers
162 views

Importance of keeping the electricity network frequency stable

The frequency in the electricity network is kept in balance by primary and secondary control among others (see e. g. here). I read that frequencies below 47.5 Hertz are dangerous and can lead to ...
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3answers
50 views

Erratic outputs from a second order system when input is too small

I'm modeling a simple Mass-Spring-Damper system to represent the torsional behavior of a micromirror. With references to some papers (this one mainly), I've constructed the model of a torsional mass ...
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2answers
84 views

3.7v > 3.3v voltage stepdown with logic-driven on/off control [paused]

(PAUSED): This topic is currently on hold as I source necessary hardware. I need to connect a Wi-Fi/RS232 module to a low-powered monitoring device, and for maximum portability, I'd like to power the ...
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1answer
52 views

Differential Drive for Heavy Robot

I'm asking here another question in relation to my previous one. I would like to know how would one proceed when you want to control a heavy robot with differential wheel drive. When it comes to ...
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2answers
49 views

Connecting DAQs in Parallel

I need to connect a DAQ to an existing system which uses a DAQ. The idea is to connect the DAQs in parallel so the existing system is not changed. It is likely that only one DAQ will be used at a ...
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1answer
56 views

Control 12V MOSFET with 5V, with PMW pass-through?

I am new to electronics, and still tying to fully wrap my head around MOSFETs. I have a few questions about controlling a 12v MOSFET using only 5v to the gate, and an incredibly small amount of ...
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43 views

Activating Triac, signal conditioning

I need help with the following circuitry. Basically it is a correction of a bug in one of my company's products, an automatic glass door controller. What it is meant to do is when I give the lock ...
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4answers
115 views

How can I control a LED with two separate control circuits?

I have a LED controlled by a microcontroller. I want to know how I can bypass this microcontroller so that I can control the LED with a separate current. Would I use transistors to switch between the ...
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5answers
112 views

System response types

Whenever I am given a system type with a certain transfer function, I am always asked to proceed to find out the 1. impulse response and 2. step response of the system. My question is, what is so ...
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1answer
41 views

SSR function con control panel

I'm new in electronics and would like to build an electric brewery with an electronic control panel. I found on www.instructables.com one control panel and is described as in following image. Could ...
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2answers
107 views

Pole-zero cancellation Paradox

Suppose we have an open-loop transfer function $$G(s) = \frac{1}{s(s+a)(s+b)}$$ If we plot the root locus for the closed-loop system we will get roughly something like this : Now the question is ...
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1answer
78 views

Regulating 220v AC voltage for halogen lamp with Arduino

I am making a project based on Arduino which is about regulating the brightness of 220v AC halogen lamp. I've read that halogen lamps are the easiest ones to regulate the brightness. However, ...
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1answer
80 views

how to regulate parallel port pin output voltage to 5V

simulate this circuit – Schematic created using CircuitLab Parallel port ideally gives TTL logic 0(low) and 5V (high). But my port gives 3.3V high. I have designed my controlcircuit ...
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2answers
94 views

Using a pulse-width modulated signal to possibly reverse polarity

I'm trying to help an artist control a simple DC motor using a single signal. The signal is a digital output, 0/5V, and the motor runs with max 36V. The motor needs to run forwards and backwards. ...
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0answers
93 views

Control Loop Frequency [closed]

I haven't started tuning/setting up my controller(s) yet, but already having trouble with the control loop frequency. This code shall later control the position of a X-Y stage. The code: ...
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3answers
101 views

What exaclty is the purpose of a Hall sensor in a BLDC?

I was reading an articles about brush-less DC motor, used in CPU fans, form this link. First I thought that the Hall sensors are used only for measuring the speed, but that is not correct, it has ...
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2answers
168 views

How can we use a usb(in a laptop) for general purpose input/output operations, such as robotics control [closed]

How can we use a usb port (in a laptop) for general purpose input/output operations, such as robotics control?? I want to control an external hardware such as a robot or say simply an array of LEDs ...
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1answer
171 views

Longest range remote control

I would like to make a long range (5Km) quadcopter. As of right now, I'm just trying to find out the best way to control it. I know that there are some 5Km R/C transmitters but they are the size of ...
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3answers
103 views

Controlling DC brushed motor for dummies, please

First, let me explain that I know very little of electronics. Thus, please, forgive me if I am asking something very obvious or abstract. I have tried to Google this but I am obviously not using the ...
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1answer
89 views

Affine Non Autonomous State Space system

Normally We all know the state space model of the the form der(x) = F*x(t)+G*u(t) y = H*x(t)+J*u(t). However I came across a state space model which has the following form der(x) = F*x(t)+G*u(t) + ...
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1answer
40 views

Electromagnetic brake torque control

I'm looking for ways to control the holding torque on an axis for force feedback purposes. I stumbled upon electromagnetic brakes which might be useful for this. But i'm not sure to what extent you ...
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3answers
1k views

Motor speed control using arduino and quadrature encoders

I am trying to get precise control over the speed of rover 5 based robot. It has four PWM controlled motors and 4 Optical Quadrature Encoders. I am using 4-channel motor controller with rover 5 ...
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1answer
34 views

Replace Current controlled Voltage Source Converter with Rectifier Diodes in ELC?

In this paper an Electronic Load Controller (ELC) for two (2) parallel generators is designed. I wish to omit the second generator and hope for simplification. Now two questions arose: (while I ...
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1answer
246 views

Weird servo mechanism

I want to use a servo taken by a radio-controlled car. However, I found out that wheels' rotation (front wheels) is not performed by a servo, but from a motor to move the wheels and a mechanism for ...
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1answer
212 views

BLDC speed and position from back-emf

I'm trying to make my own sensorless speed controller and I need to know the speed and the position. What are the basic techniques used to determine the speed and position of a BLDC motor from the ...
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1answer
69 views

Exclusive control over actuators

I feel kind of stupid asking this question, but after unsuccessfully searching for papers and then starting to draw my own solution with a lot of XORs to the following problem, I started wondering ...
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4answers
225 views

How to decrease solenoid speed?

My project is Speed Control of a solenoid. In this project, stroke is 30 mm and I want to plunger cross 30mm in a few seconds (like 5 seconds). For this purpose I want to control the current of the ...
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1answer
900 views

Controlling a 4-wired fan PWM Signal using Arduino allows only two settings

I have connected my pwm pin to my arduino like in this tutorial http://fritzing.org/projects/reading-pc-fan-rpm-with-an-arduino/ It's working properly. I can read and set the speed using a sketch ...
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3answers
288 views

What should be DC gain of the system?

Step response of system is \$c(t) = 5 - 0.5e^{-2t} + 8e^{-t}\$ then find steady state gain. Answer is -7.5 Now in book solution is given as : Since this is step response we will find impulse ...
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2answers
2k views

What is a “dry contact input”?

I'm a PC software guy, a newbie to electronics. Recently, I've got a project in which I need to source for a DAQ that can provide dry contact inputs to an interfacing digital output controller. The ...
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2answers
572 views

I need help designing a speed control dc motor circuit

We were asked to design a motor speed control circuit using A 15V Source -> Potentiometer ->LPF-> Op-Amp -> ADC ->DAC ->Op-Amp-> Motor Driver -> 3V DC Motor (because of its low cost) I am going to ...
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1answer
241 views

LED driver problem

I am using an LM324 and three TIP122 transistors to drive three 40V 40W led's. The problem I am having is the LED's don't shut of all the way (a very dim glow remains). If I use only one op amp (out ...
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1answer
157 views

I have a 110 VAC solenoid and want to know what kind of circuit i should build to control it from my microcontroller?

My solenoid is part of an old espresso machine, the circuit that detected low water level died and i can't replace it. I am adding a micro-controller to remotely turn it on and off and to control this ...
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1answer
294 views

Brushless DC Motor - Sensoreless Startup Algorithm

I am trying to achieve speed control of a sensorless Brushless dc motor (Back Emf method). Initially its speed is zero so Back emf is zero, so there will be no feedback, in that case what do i do? ...
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1answer
85 views

LED control using GPIO [closed]

I am using an industrial camera that has GPIO ports which I would like to use for turning LED plate off and on. LED runs on 24 V and 350 mA (between 350 mA and 1500 mA but 350 mA would be optimal). ...
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1answer
90 views

Control 9.6v battery line (on/off) with a 5v I/O pin?

I would like to control a DC 9.6v battery line (on/off) with a 5v digital I/O pin on a little microcontroller. I think the best way to do it is using a small relay (something like this), but I'm not ...
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3answers
485 views

How to make a wired input IR demodulator?

Objective: I'm trying to make a wired infrared input for a microcontroller. Incoming signal would come from a remote control device that has an IR emitter output jack. I believe that all I need is ...
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2answers
337 views

Feeding a Full-Bridge from a Boost Converter?

I have been researching about designing a 3kW DC-DC Converter (Vin 12V from a battery, Vout 350VDC) and actually wired up a simple isolated Full-Bridge based DC-DC converter a few days back converting ...
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1answer
156 views

Time Warp - Controling an analog clock from another room

My goal is to be able to spin an analog clocks hands forwards and backwards through a controller box that I build and wire to an analog clock. To accomplish this I imaging that I need a small hobby ...
2
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1answer
408 views

DALI : How commissioning process takes place in DALI system?

I have gone through various documents regarding the Commissioning in the DALI interface. But I finding it difficult to understand some of the points. So if anyone with DALI Commissioning can help me ...
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1answer
62 views

Clarification of speed control

Please could I know if the diodes in EESE question “Control speed of Nidec fan” ARE zener diodes (as the symbols sugest) or normal diodes as on another article they had the exactly the same circuit ...
3
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3answers
272 views

Does the frequency of a PWM signal have to be constant for a DC motor/fan speed control?

All PWM control systems I have seen for DC motor/fan speed control used a constant frequency. Is this really necessary in all cases? How would the motor current have to be calculated for a PWM ...
2
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2answers
1k views

Using a transistor to add to max current output from a opamp?

I thought I understood transistors but now I'm confused again. I have a basic opamp circuit to amplify the input of a electret microphone. The output of the opamp will vary within 1-4V. Now I want ...
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3answers
606 views

DC Fan Control (Switching on/off)

I'm using an MC25060V2 fan, and I'd like to switch it on and off through software occasionally (i.e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET ...
2
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0answers
76 views

Pump control - Uni or Bi polar stepper motor

I am working on a robot that includes several annular gear pumps. We are using the MZR 2521, manual: (please see section 5.5) http://www.micropump.com/support_documents/manual_mzr-xx21.pdf product ...
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1answer
86 views

What's the difference between delayed branch and branch prediction?

I'm studying how delayed branch works and I'm trying to distinguish delayed branch from branch prediction. What is the difference? Is delayed branch a means to facilitate a control hazard?
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1answer
378 views

Speed control for high power DC brushed motor

I am going to drive and bi-directionally control the speed of some 12V/24V, 100W to 300W DC brushed motors. I have some experience in controlling small DC motors (6V/9V/12V, 0.5A to 2A) with PWM ...