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

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1answer
29 views

RF Transmitter and Receiver circuit for Omni-directional Robot

Originally posted this in Robotics beta stackexchange: http://robotics.stackexchange.com/questions/9958/rf-transmitter-and-receiver-circuit-for-omni-directional-robot I'm trying to build a RF ...
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1answer
45 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\$?
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1answer
42 views

Remote control of DC motor

This is PWM controller I bought for speed control of DC motor: ...
1
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1answer
72 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 ...
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2answers
84 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
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0answers
43 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
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2answers
81 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
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1answer
51 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
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1answer
86 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
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1answer
65 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 ...
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1answer
46 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 ...
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2answers
116 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 ...
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3answers
221 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 ...
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4answers
142 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 ...
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5answers
199 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
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0answers
51 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
62 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, ...
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1answer
98 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
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1answer
28 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
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1answer
121 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
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1answer
148 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
115 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
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1answer
224 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
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1answer
41 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 ...
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1answer
71 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
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1answer
83 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
203 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
23 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
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1answer
413 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
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3answers
142 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
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1answer
238 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
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1answer
290 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 ...
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0answers
64 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
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2answers
151 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
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1answer
88 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 ...
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votes
1answer
43 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
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1answer
197 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
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2answers
53 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
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3answers
244 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 ...
2
votes
2answers
311 views

Basic 12V Step-Start Circuit For Automotive Fans: Troubleshooting

To keep this short and sweet, I wanted to make a circuit/controller to decrease the inrush current on a large powerful fan for my race car. I ideally just wanted something that wouldn't let the amps ...
0
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1answer
183 views

RC debounce mosfet gate

I am trying to debounce a switch that controls the gate of a mosfet. Will the circuit below work, or do I need to re-arrange some of the parts? *The circle thing should have been drawn as a mosfet. ...
7
votes
3answers
1k views

Why do RC applications use such a small PWM duty cycle?

I know that RC applications, such as a drone, use PWM signals to drive the motors. This PWM signal is mostly 50 Hz (0.02 s). The pulse itself varies from 1 ms to 2 ms. So a ...
0
votes
2answers
106 views

Linear Oscillator Frequency Problem

I was doing one of the problem sets when I stumbled upon this gem. I know that for oscillation to occur, the gain has to be greater than 1. The loop gain I computed is Could anyone suggest any ...
4
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4answers
501 views

Rc network placing R before C vs after

simulate this circuit – Schematic created using CircuitLab Using a rc network to smooth a PWM signal from a microcontroller, to a true analogue voltage. What will be the effect of having ...
0
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1answer
124 views

Remote Control Program for ATMEGA168P circuit

Hello I will make maybe a fool questions. I have this diagram: This diagram is to turn on/off led lights, make blink via remote control. Now the questions are: 1.-What kind of remote control I can ...
1
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1answer
108 views

PIC 16F57 and T0CKI pin

I've been working on a remote control made out of a PIC 16F57. The PIC will wake up on every keypress, send the IR code and go back to sleep. the remote is working fine, unfortunately I forgot to tie ...
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1answer
175 views

Calculating RC oscillator frequency

I'm working through an old Popular Electronics article, trying to apply and learn some of the math behind the project. Math for the clock pulse generator frequency has me stumped; wondering if anyone ...
1
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1answer
228 views

Will LiFePo4 work with ESC for LiPo?

Im just a little bit confused wether if LiFe batteries will work the same with an ESC (Electronic Speed controller) Whats making me confused is that in the description they only talk about LiPo ...
1
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1answer
198 views

Electronic hit detection

I'm building various r/c vehicles like warplanes, tanks, auto-turrets, etc. and I want to fit some of them with some kind of a weapon. I've decided an air soft gun is a good choice. So, mounting and ...