For questions related to the remote control of devices and the design of remote controls.

learn more… | top users | synonyms (1)

0
votes
1answer
77 views

Calculate R+ RC to stretch pulse from hall effect output

I have a [Optek OH090U][1] hall-effect. I am trying to stretch a pulsed output by adding an RC circuit. Basically I want the output to be on (low) as long as there is a pulsing of the magnetic field ...
0
votes
1answer
30 views

Using an ATS interface to remotely start a generator

I am trying to use the ATS (automatic transfer switch) interface of a generator to set up a remote start system using a microcontroller with a cell phone modem and relay bank (for a rural microgrid ...
0
votes
0answers
11 views

Multi-frequency PWM generation for various TVs

Given I have different TV brands (IR receiver freq: 36Khz, 38Khz, 56Khz), and I want to turn them off at the same time. (supposing all of them use the same IR code) Would it be possible to transmit ...
-1
votes
0answers
34 views

how to remote control LED matrix within nearby sealed environment

I want to display text on an LED matrix that is located within a sealed environment. I want to change the text by remote control, by using my iPhone. Power is available in the environment for ...
3
votes
0answers
65 views

Electric circuit diagram proof check - simple

im completly new in this subject (electronics, i began today) and therefor quite the newcomer and would like to know if i understood the use of transistors and capacitors and the diagram in a whole. ...
1
vote
3answers
112 views

Help with electronic components

Hello im completely new at this subject, so this might be a "newbie" question, but i need some help with finding some components, if they exist. I would just like to know the names of the components ...
1
vote
2answers
91 views

wirelessly remote-controlled DC power supply with variable voltage

I need a remote-controlled (wireless) power supply, outputting between 0 and 10 volts and 0 and 2 amps, preferably DC. It should take 110v/120v AC as input. Its voltage should be controllable with a ...
1
vote
1answer
125 views

RF Transmitter and Receiver circuit controls

I'm trying to build a Radio controlled TX and RX circuit (using a 2.4 GHz chip and MCUs), to control a robot with four DC geared motors. I plan to use four momentary on-off-on switches on the TX ...
0
votes
2answers
111 views

What happens to current in a RC-battery circuit when you move plates with a square signal?

I use an RC circuit connected in series with a battery. I change the gap between plates of my air capacitor (2 paralleles plates, one fixe, the other one moving with an actuator) so as to change my ...
0
votes
0answers
27 views

Resonant RC Series and deriving equivalent circuit

How is it that this is equivalent? Assuming all transients have died out. vi = Vcos(omega*t) The fake input was defined as: \begin{equation} v_{cp}^\sim = \frac{V_i}{1+j\omega_1RC} e^{j\omega\\_1t}...
0
votes
1answer
47 views

What steps would it take to hack an Xbox 360 controller to accept input from a computer program?

I understand the Xbox 360 encrypts it's signals from controller to console but I'm curious if there is a way to trigger the analogue and button signals on some under-the-hood 'surface' layer that ...
0
votes
1answer
51 views

How was Vc(t) found in this source free RC circuit?

Shuldn't \$v_c(t)\$ be the same as \$10^4\space i_s\$ after \$t=0\$?
0
votes
1answer
49 views

Remote control of DC motor

This is PWM controller I bought for speed control of DC motor: http://www.ebay.com/itm/6-30V-DC-Motor-speed-Controller-Reversible-PWM-Control-Forward-Reverse-Switch-/162002954574?hash=item25b820e94e:...
1
vote
1answer
77 views

How to identify a component on a board?

I am trying to identify a component on a board of my roller shutter remote control. Here is the board: The main component is very likely the one top-right, identified by ...
0
votes
2answers
115 views

RC controller design for small car

I am creating a small car that is to be controlled by a small hand held joystick remote. basically I am trying to find the best option for doing this task. The vehicle has two 24V motors, one for ...
0
votes
0answers
55 views

Relay turn off delay

I need help with my project. I want to design a circuit for my car. It goes like this: Blinker on car is made with 1-filament bulb. I want to use this bulb as indicator and as DRL (made by PWM - ...
3
votes
2answers
95 views

Is it safe to over-volt brushless out-runner dc motor on low load conditions?

I have a 1100KV brushless DC motor (turnigy d3548/4) rated maximum voltage 19V i want to run it at 25V assuming low load as i mostly need the higher rpm ! whats are the effects of this higher ...
0
votes
1answer
57 views

using 8 AA or Ni-MH batteries instead of one 12V 23A type battery to power a remote receiver

Sorry for the novice question, but I am thinking there should be a simple solution. I work as a magician and purchased an effect where a snake puppet in a basket goes up and down on a battery powered ...
0
votes
1answer
113 views

Series capacitor balancing in RC filter

I am trying to make a 600v RC filter with a cutoff frequency of 1hz or less. The problem is the capacitor prices for these voltages are too high. I want to use series capacitors to up the voltage ...
1
vote
1answer
71 views

Retrofit a Hi-Fi remote with a RF 433 MHz module

In the past I used a remote for a AIWA Hi-Fi to control a AVR processor and circuit I custom made. I used an infrared receiver from Vishay (tuned on the 38 kHz) to demodulate the signal, then fed to ...
1
vote
1answer
48 views

Pulse Low on High Signal

I am trying to build a circuit that disconnects the output for a brief time when power is connected. However I want the circuit to remain connected after power is removed. I can achieve the first ...
0
votes
2answers
162 views

Remote (RF or IR) control of DC motor

Here is schematic that provides polarity inversion and switch off motor if it reaches one of its two end positions: SW1 is On-Off-On DPDT switch with the center position Off. SW 2 and SW 3 are ...
1
vote
3answers
295 views

What PWM frequency would give higher torque or RPM for a Brushless DC Motor

We use brushless DC motors (three phase, star wound, 540 size)in RC car applications, these are controlled by electronic speed controllers (ESC's) which will obviously vary the voltage etc supplied to ...
3
votes
4answers
189 views

RC car steering circuit: what does it do?

I have just disassembled a RC car. Attached to the stepper motor that controls the steering of the car was a small circuit board with a cog wheel attached to it. I am trying to figure out what this ...
0
votes
5answers
382 views

Is there a device that can push down on a button with a wireless remote control?

I'm looking for a device, perhaps one that releases a small piston, tiny object, or block, that can press down on a button via wireless remote control. The button is about the size of a dime, and is ...
1
vote
0answers
64 views

Protocol used by tankless water heater remote control

I'm using an EcoSmart ECO 11 electric tankless water heater in a hydronic system. This heater has a "Remote Control" port on the side. The port is an RJ-11 jack with 4 wires. I want to interface ...
3
votes
1answer
67 views

How to delay a relay closing?

I have a situation where I'd like to delay the closing of an off the shelf relay by ~5 seconds. Assuming it is a 5V coil, and switching 12 V, I'd like the following: t 0:00: 5v applied to input, ...
0
votes
1answer
110 views

Modbus RS485 - Voltage greater than 12V?

I have a boiler (Immergas Eolo Star) which has 2 pins where you can connect either a normal thermostat or a "remote control unit" which can also give more detailed information (self-diagnosis) about ...
1
vote
1answer
29 views

Which instrument for arbitrary signal commutation (matrix)

I would like to test a bunch of sensors. Each sensor has a DB15 connector with mixed digital and analog signals (bw ~5MHz, Z ~120R). I am looking for an instrument where I can control which couple ...
0
votes
1answer
127 views

What frequency is this remote using? [closed]

I have a garage remote control I'm trying to duplicate, but the 433Mhz cloner I bought isn't responding to it. Can anyone please confirm my remote is using 433Mhz frequency based on this circuit board ...
-1
votes
1answer
169 views

Can I salvage a 2.4GHz controller? [closed]

I used to have a tiny helicopter that came with a funky 4 channel controller. I still have many of the pieces from the helicopter (windy day :( ) including the controller. I have recently bought an ...
3
votes
2answers
136 views

Analyzing RC-circuit with diode

I'm trying to make an explanation for the behavior of the following RC-circuit with a diode pulled up to 12V. The input signal is a square wave alternating from -7V to 12V. My intuition is that the ...
1
vote
1answer
310 views

How to capture, save, and rebroadcast an infrared signal?

I need to capture a signal that is being sent from an emitter (similar to a TV remote). I understand from this question that I can use an infrared receiver to do this.Once this is done, however, I ...
0
votes
1answer
45 views

Interference between 27MHz RX and 5.8GHz TX

I've got a 27MHz RC car and 5.8GHz Fat Shark video transmitter. When I drive the RC car using the video transmitter, it seems to lose signal from the 27MHz remote at a pretty close distance, say 2-3m ...
-2
votes
1answer
74 views

Using Esc without BEC with lipo batteries [closed]

I have an ESC which doesn't have a BEC. Is it possible to use without a BEC directly with 3S lipo batteries
7
votes
2answers
1k views

What is the purpose of the IR-diode Cover on Remote Controls?

Some electronic devices' remote controls have their IR-diode covered with some glossy, dark acrlyic-glass like screen, others dont and you can directly see (and possibly touch) the IR-diode. What is, ...
0
votes
1answer
101 views

RC Lawnmower: Joystick emulation: RC PWM to _custom_ DC conversion

TL;DR I need something to map 0-5v PWM signal to 4.6v-7v DC (~10mA), kind of like what an RC speed controller does. I'm trying emulate a 2-axis, hall-effect joystick so that it can be controlled by ...
2
votes
2answers
226 views

Very simple signalling over 12V DC power wire?

I found some DC power line comms circuits but they seem too complex for my needs. I have 6 outside LED RGB lamps that are linked with a single 2 core cable running around the edge of my garden, it is ...
0
votes
1answer
24 views

Representation/Effect of a delay element in the frequency domain?

If I have a simple RC low pass filter in which the output is taken across the capacitor, with a particular cut off frequency say x Hz. Now if I were to introduce a delay in the path of the resistor, ...
0
votes
1answer
541 views

Activating apartment building buzzer “Door” open button remotely

I often times have difficulty getting to the buzzer of our building quick enough for FedEx and UPS, etc... or when I get visitors, they are sometimes inpatient and keep buzzing even though I'm still ...
0
votes
3answers
150 views

How to convert 3.3V from Raspberry Pi to usein a Remote Control Car which needs 3V

I need a 3V ( 2 1.5V batteries) for a RC car transmitter and I have a Raspberry Pi Model B giving out 3.3V. How can I convert the 3.3V from Raspberry Pi to use it in my RC car Transmitter ? Basically ...
0
votes
1answer
276 views

Replacing simple physical switch by an arduino controlled digital one

My electronics knowledge is extremely basic, but i have started playing around with Arduino Uno to which i send commands from a C# program. For a next project, i would like to extend my set up in ...
0
votes
1answer
359 views

why discharging capacitor voltage in a rc circuit is positive? why it should not be negative?

During discharging, the direction of the current is opposite to the original current direction(source current).so the current is negative. likewise the discharging voltage direction is also opposite ...
0
votes
0answers
65 views

How can I calculate the noise in a simple RC high-pass filter?

How can I calculate the noise in a simple RC high-pass filter? (Assuming very low input impedance and very high output impedance.) I know the Johnson noise in the resistor should be 4kTR, but I'm ...
0
votes
2answers
162 views

Help building a scheme (involves L293D H-bridge)

I'm making a bluetooth-controlled fire truck for my son based on an old wire-controlled truck I bought at a yard sale. It didn't have its wire-remote. I already got Arduino Nano to drive 2 motors ...
0
votes
1answer
96 views

How to hook digital input to remote control buttons?

For a DIY project I would like to adapt a remote (RF) control to accept digital signals from MCU. I am not quite sure how the buttons in question work: Are they normal buttons which make near 0 ohm ...
-1
votes
1answer
47 views

Emulating the start/stop button on the remote control of the iPhone

I need to build an (apparently) extremely simple device which is basically a pushbutton that pauses and restarts the playback on an iPhone. This is exactly what the central button does, on the remote ...
0
votes
1answer
215 views

Multichannel RF transmitter design for 315MHz and 433MHz

first time designing RF, so pardon my ignorance. I want to design a ASK/OOK transmitter board operating on both 315Mhz and 433MHz ISM band frequencies. I have a MCU onboard that generates the data to ...
1
vote
2answers
54 views

How do car trackers communicate?

So i was thinking, How do car trackers or long distance (over 100kms) remote control communicate to their central commands,? Do they use the cell phone network? what could one require to set up such a ...
0
votes
3answers
260 views

Calculating Fc (cutoff) of series to RC to ground on inverting input of non-inverting amplifier

Regarding the chosen answer for: How does this OP-AMP non-inverting amplifier work? The following circuit is given, and it says that $$F_c = \frac{1}{2\pi R_1C_1}$$ simulate this circuit &...