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

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4answers
121 views

Waveform generation with opamp

I need to design a circuit that generates the voltage waveform shown in the Figure 1 when an input voltage is applied as shown in Figure 2. Figure 1 and Figure 2 are in the second link below. Only ...
6
votes
0answers
118 views

Does putting a car remote on your chin make it more effective? [duplicate]

Recently asked on Physics.SE: Why does a remote car key work when held to your head/body? And also, similar claims abound. RF engineers know that putting a big conductive thing like a human head ...
1
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0answers
32 views

What does a tank ciruit work in a Cmos integrated circuit [closed]

It is a capacitance parallel to a inductance. I always find is hard to understand whether it has certain function in a circuit
1
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3answers
107 views

What's an analog way to measure only the on-time of a servo PPM pulse?

Hobby radio control receivers typically output a 1-2 or 0.5-2.5 ms pulse every 50 milliseconds, and only the duration of the high pulse matters. Now the best way to decode this signal is probably with ...
1
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0answers
87 views

Quadcopter plummeted into the ocean

We have a quad copter which had an arm partially detach mid-flight, which in turn destabilized the vehicle, plummeting it into the ocean. After two hours of searching we were finally able to recover ...
0
votes
1answer
28 views

Know the transmission speed between PICAXEs with Radio module

I was wondering if I could know the transmission speed between 2 PICAXEs using an Radio Module. At the moment I tried to send data between 2 PICAXE 40x2 only with the 433MHz Radio Transmitter. The ...
0
votes
1answer
97 views

Battery Elimination Circuit Powering Flight Controller

I am putting together a quadcopter, and one of the things I've stumbled across that I don't quite understand is Battery Elimination Circuits (BECs). The Flight Controller on my quadcopter is a modded ...
5
votes
0answers
102 views

How can I check if there is a signal from my radio-frequency type remote control (RC) [duplicate]

You can test the output of a television infrared remote control by photographing it with a digital camera - you see on the image if the infrared LED lights up. Is there a method, without an ...
2
votes
1answer
83 views

Convert TV Remote To NMT Remote

I've got a 4 year old LG TV remote control, which I recently took apart. I've also got a Popcorn Hour A-100, without the original remote. So my question is - given that I don't care about the ...
1
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1answer
95 views

Transistor as a mute switch, odd rise and fall times?

I need to mute (soft mute, no clicks and pops) an audio signal while routing it using a mechanical relay. I use a 2N5089 high gain NPN with a grounded emitter, collector to the signal output and the ...
2
votes
1answer
168 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 ...
10
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2answers
313 views

Help with or hints for decoding an IR protocol

Some time ago I bought a simple and cheap little IR-controlled toy helicopter (same as this one - it's called "Diamond Gyro" or "Diamond Force"). For fun, I've been looking into controlling it via an ...
0
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1answer
62 views

Can a smartphone transmit over the 902-928MHz bands? [closed]

I came across a remote control that uses the 902-928MHz band. Can a smartphone transmit WiFi/Bluetooth over those frequencies? If yes, is there anything special about it? Thanks
2
votes
1answer
177 views

RC Circuit response to different input voltages

For an RC time constant circuit like below, what is the behavior of the circuit for different inputs: A Linearly rising input. A repeating Sine wave Square wave Based on the values I do ...
2
votes
1answer
116 views

AVR Interrupt “Interference”

I'm currently working on receiving signals from an RC remote. I have used pins A8 to A15 on my Arduino Mega board. The ports and interrupts are setup with the help of this code: ...
0
votes
1answer
419 views

RC Car mounted Raspberry Pi runs out of juice

I'm trying to make a Tamiya Blackfoot RC car run on a Raspberry Pi. I've written a small C program for controlling the servo and the ESC/motor with a wireless gamepad. Everything is working fine ...
1
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1answer
139 views

Nano Electric Receiver Switch - Circuit Components

I want to recreate the circuit board below, but I am having a hard time figuring out what components I need. I have been trying to look them up on mouser but I haven't got any results. It is called ...
0
votes
2answers
187 views

Making my own 38kHz remote

The issue I am having is it appears many modern remotes don't have a 38kHz carrier frequency for the infrared signal. I would get inconsistent readings using an TSOP 1738. Since the remotes you can ...
2
votes
1answer
104 views

Choosing voltage regulator and battery for a compact RF remote control (transmitter)

I'm designing a remote control based on a TWS-DS-6 433.92MHz transmitter and I wanted it to be really compact and energy efficient. I plan to have an ATtiny85 controlling the transmitter and use ...
1
vote
4answers
135 views

Increasing voltage to motors

I'm got a RC car, which can go forward and backward and it's supplied by ~5V battery. At this moment the circuit looks like this: and the board can swap ...
0
votes
0answers
105 views

Relay/TRIAC for water heater switching

I'm designing a remote controlled switch for my water heater and I am bothered by the following questions: Should the switch be DPST, or can I just switch the phase line (dangerous?) ? can I do it ...
2
votes
1answer
108 views

Can I use this Anker Astro 3e to power my arduino through the usb?

http://www.amazon.com/gp/product/B009USAJCC/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1 Will there be any electrical problems? I'm building a arduino controlled car (with a chassis like this: ...
1
vote
1answer
455 views

Increase the range of RC controller

I got a old RC car + controller, I would like to increase it's range. I did a research and I found a idea here. The idea states: Here's what you do. Parts: one (1) NPN transistor. Tools: Soldering ...
0
votes
1answer
254 views

Using 27MHz car with 49MHz remote control

I managed to do something like this guy here, but after I connected the Arduino to the 49MHz remote control, I figured out that I have another car which works on ...
1
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1answer
90 views

Connecting RC remote to Arduino

I found a old RC Car. I'm electronic begginer, so my question might be dump, but I can't figure out how I can do this. I Separated the remote and connected it's power to the Arduino board. At this ...
2
votes
1answer
260 views

Cause of difference in theoretical and experimental values of RC time constants

What accounts for the slight difference in the theoretical and experimental values of the time constant in a simple RC filter? The slight difference was just (.5*10^-4) seconds
0
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1answer
108 views

Isolated closing contact other than relay?

I need an isolated closing contact, like a relay, but ideally solid state. Rating 24V 100 mA on the contact side would be plenty. 1 kHz operation would be enough as well. I will drive this from 5V 25 ...
0
votes
1answer
99 views

Remote Control Circuit

I tried to build a kind of R/C catamaran working with computer fans using an R/C car circuit (27 MHz). The original circuit uses 6V batteries but the fans uses 12V. To make the fans faster, I've given ...
1
vote
4answers
325 views

variable-speed focus PTZ protocol

I'm building camera systems to mount on top of a TV tower. When storm clouds roll, in the video is displayed on the TV weather report. No one wants to climb the tower to manually pan and tilt and zoom ...
-2
votes
2answers
110 views

Is there a device to automatically disconnect network or otherwise time limit a physical connection to a network [closed]

Is there a device to automatically disconnect network or otherwise time limit a physical connection to a network? The why? We are dealing with a production outage of large industrial equipment. The ...
1
vote
1answer
108 views

Connecting Arduino to a Monster iEZClick Remote

I am looking to do a project with an Monster iEZClick Remote Control using an Arduino Pro Mini 328. The Monster iEZClick Remote Control is an RF remote that transmits to an iPod socket connector that ...
5
votes
3answers
280 views

Recommendation for ADC noise filtering?

I'm using an ADC (adc081c021) with a pretty noisy input: There is also a 5-second video here: http://tinypic.com/player.php?v=2ue47cm&s=5 The objective is to detect the two peaks. How could I ...
-1
votes
2answers
109 views

iPhone control LED light without wifi

I am fresh to the electrical engineering, and actually I am a web developer, ruby and php, etc. I am wondering that is there a simple way to control one or more LED lights using iPhone without wifi ...
2
votes
2answers
195 views

What is the capacitor charging time when charged with a pnp current mirror circuit?

I want to use a 555 in monostable mode to make a ramp signal generator. The capacitor would be charged using a current mirror circuit. Given a input voltage, what would be the charging time of ...
-3
votes
1answer
143 views

How does remote switches learning system work? [closed]

I've been searching like crazy for none success so now im asking you guys. You know these electric control switches that you can turn on and off with a radio wave remote control? Usually the remote ...
1
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3answers
157 views

Identifying SMT element 331K

I am trying to repair a remote from a car lock. The symptoms are that a red led is lit longer than usual after button press and no respond from car lock. It works sometimes. The battery and ...
0
votes
1answer
2k views

Using a PNP transistor with Arduino to close a circuit

I have teared down a radio controller of an RC car. I'm trying to control the car with a PC through Arduino Mega 2560 Rev 3. The controller is very simple. It takes 9 V in. There is six wires to ...
1
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1answer
181 views

Controlling Analog RC Car Remote with Arduino

I want to take my RC car remote, which uses a potentiometer to control throttle, and connect it to an arduino in order to control the cars speed. The ardunio fits perfectly in the base of the remote. ...
0
votes
2answers
191 views

IR Remote, use a relay to send on and off pulses

I have a little problem. I'm using the raspberry pi to send a output signal from the GPIO pins to activate / deactivate the relay. I have a IR remote, when i short the two "connectors" on (for example ...
1
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1answer
353 views

IR remote output signal without IR Led and TSOP

I have IR receiver module based on AVR + TSOP, it gets IR signal from remote and passes it to RF tranceiver. Now I want to make some improvements and try to connect output (IR Led pins) of IR remote ...
3
votes
2answers
422 views

Identify an IC Found in a Garage Door Opener

Inside a defunct garage door opener I found this IC: I tried searching for 33192C with variations of 'datasheet' and such keywords, but I got routed to the usual datasheet farms who are happy to ...
2
votes
1answer
299 views

Arduino infrared problem with universal remote

I am playing with Arduino and Ken Shirriff's IR library. I am trying to control Sony audio receiver using codes I found on the net. Everything works OK, I am able to control the device by sending IR ...
0
votes
1answer
131 views

RC AM senders/recievers: Changing the crystals, and using Servo PPM as a 1/0 switch

I am trying to use a 27mhz RC car controller to send to an RC Car AM reciever and use that output (short 1-1.5ms pulse of a few mA) to trigger a 5V relay, with the signal stabilised via a ...
1
vote
1answer
2k views

Arduino alternate PWM input method

I'm working on a rudimentary flight stabilization system for an airplane, which reads in 4 PWM inputs from an R/C receiver. The problem is, the pulseIn command is taking far too long to execute, so I ...
1
vote
2answers
219 views

Where to place a RC filter regarding decoupling capacitor?

I would like to add a low-pass RC filter (500Hz) to the power rail of a TLV2782 op-amp. Datasheet of TLV2782 recommends two decoupling capacitors: 0.1uF and 4.7uF and they are currently placed on the ...
0
votes
1answer
306 views

Replacement for 5610 Transistor

I have a circuit (from a RC car) that uses a 5610 transistor, which can't find in store. Is there any equivalent transistor? Here are pictures of the board (click here for high resolution images): ...
4
votes
1answer
1k views

Are there any RF remote control circuits without any ICs?

I'm currently trying to make a simple 3 channels RF remote control circuit but without any ICs or micro-controller. I'm Googling but it seems to not populate (useful results). Does anyone have ideas?
3
votes
1answer
592 views

Controling a regular residential 110V/15A circuit switch (or relay) from a PC

I am a software engineer by trade and also a rather skilled and well rounded (residential) builder with a special interest in wiring. I have rewired my entire two-unit house, panels included and seen ...
1
vote
1answer
941 views

How to calculate the range of a RC transmitter

When searching for a transmitter for a RC application in most of the cases they don't provide anything about the range of the module. Just power and the frequency. The Tx power must relate to the ...
3
votes
1answer
148 views

Aren't UBEC's just packaged voltage regulators?

I'm working on a project where non-trivial currents (theoretical peak ~6A) are needed at several different voltages. Since this is battery-powered, I initially started looking at finding an ...