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

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3answers
125 views

How does the automatic garage door opener know which button I've pushed on the wall control panel?

The wired wall control panel in my garage has only 2 wires connected to it. Yet somehow it acts different when I push the big "door" button than when I push the "light" button or the "lock" button. ...
0
votes
1answer
58 views

Help converting analog potentiometer to digital

I have a 3 dial motor control assembly that is using 3 potentiometers to control 3 independent 110v motors speed. The label on the pots read TO50K 1339 (first O has a "S" like shape inside). I have ...
0
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3answers
66 views

Different time constants for charging and discharging of modified RC circuit

I recently performed a test in an electrical measurements lab which left me confused. I measured the response of the following circuit: And obtained the following output: According to my ...
1
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1answer
65 views

How to “push buttons” on voltage ladder?

I have a quite simple task I can't wrap my head around. I have an old home 5.1 sound system with optical input that plays sounds from my media center. Its remote broke, and while I tried to fix it, I ...
1
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1answer
63 views

Why are the charge and discharge rate of Lihium Polymer Batteries different?

I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many ...
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1answer
52 views

What bluetooth chip / type should be used for a remote control car? [closed]

I am building a small remote control car to be controlled by bluetooth (iOS and Android). I am having a custom circuit board built, and I want to know what bluetooth chip I should get. I would like ...
0
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0answers
28 views

Custom IR LED controller for two independent strips

Is there a way to modify a controller with IR remote to control two separate led strips independently. Basically you have two strips, one controller, one remote and you can change the color|turn ...
0
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1answer
167 views

Length of a 40MHz antenna

A few days ago I had the brilliant idea of replacing the ugly antenna of a 40MHz car remote control with an extendable one. Now the range decreased from 50 meters to 3-4m. I don't know exactly what I ...
0
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1answer
84 views

Preventing Reset during ESD

I would like to design a RC filter to prevent reset to a SoC during a ESD strike. Assuming the reset net is by default low. And the reset comes from a separate board which connects to the main board ...
1
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1answer
76 views

Is it possible to use a XBee module to controll a quadcopter? [closed]

I'm thinking to design my own quadcopter and wondered if it's possible to use a XBee module to control the drone? The reason I'm thinking about an XBee module is because I want to be able to plug it ...
0
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0answers
92 views

Useing RC Switch Library for Transmitter and receiver in arduino

I have a RF remote and want to replace this with Arduino using RC Switch library. I want to sniff the codes from existing remote and send using RC Switch library in arduino. Is there any tool ...
0
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1answer
128 views

How to make power supply to 434MHz receiver module more stable on RC car?

Following the recommendations I got on my last question about troubleshooting communications in my RC car, I probed the +5V power pin of my RF 434MHz receiver module with my oscilloscope. Below is a ...
2
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1answer
184 views

RC toy car RF signal drops out when at full speed

Short version (TL;DR): I need help troubleshooting the radio communication of an RC car that I made. Every 5s or so, the connection drops out and the car spends about 1s without receiving instructions ...
0
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2answers
76 views

How do I hold a signal high from one high pulse?

Assuming I send a signal wirelessly to a receiver connected to a fan. if the receiver detects that a pulse is there, it switches on the fan. the fan should stay on until it detects another high pulse, ...
3
votes
0answers
137 views

Does a 40 MHz radio frequency have any interference to Bluetooth signal?

From my understanding, the Bluetooth signal is using a 2.4 GHz frequency. However, when someone is playing with a 40 MHz RC vehicle, the Bluetooth signal keep on getting interrupted or disconnected. ...
0
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2answers
50 views

RF remote with three buttons

I am trying to create an RF remote that has 6 buttons but the RF encoder only has 4 inputs. Is this possible and preferably I would not like to use a separate chip. This is what I am using: ...
1
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1answer
123 views

Specs of HK-TR6A remote controller receiver

I'm trying to use a 2.4 GHz digital 6 channel remote controller to send signals to an Arduino UNO R3 board. The receiver is the HK-TR6A-V2. I can't find any information on what each pin input/output ...
1
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0answers
140 views

BLDC motor control PCB

I am trying to make a PCB to control a Sensorless Brushless motor. I just wanted to know if it looks right. The IC I am using is a TB6588FG it has a 2.5A peak output current. I want to use it with ...
1
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3answers
69 views

Using Bluetooth 4.0/LE verses RF

I am asking this question in hopes to get a solid answer from anyone who has direct experience dealing with the most recent RF as well as Bluetooth 4.0/LE developments. What I am essentially trying ...
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2answers
118 views

Understanding circuit : Output of a CD4017 with 1N4148 diode and RC circuit

I'm reading a circuit on a magazine (look at circuit below) and i don't understand , why the author put a 1N4148 diode and a RC circuit at the output of CD4017 , what is the operations of the RC ...
0
votes
1answer
273 views

Replay Philips Livingcolors remote signal

I have a Phillips Living Colors Lamp, which comes with a remote control. I'd like to be able to capture/replay the signal of the remote control so I can control the lamp with a microcontroller ...
1
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1answer
56 views

Why does PC still get a little power from power socket turned off through remote control? [closed]

I have bought a power supply device to remote-control the power consumption at home. This works very well, however the PC has a little blue power light that keeps blinking from time to time even ...
-3
votes
1answer
66 views

Eflite Reciever Hack

I have the Eflite ELFH1025 reciever and remote I stripped from an RC Heli I had. The thing is that it wants to control everything and to make sure every component of the heli is functional before it ...
0
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0answers
45 views

Minimum effort remote solenoid

I want to mechanically press a button remotely with a solenoid and a remote controller in a range between 10-15 meters. What is the easiest way? Or are there any manufacturers selling a kit?
3
votes
1answer
604 views

RC LED “Bathroom occupied” indicator

I want to build a little LED indicator for my bathroom door. The basic idea is that when a person sits or stands next to the toilet, a little transmitter signals it wirelessly to the LED diode which ...
1
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1answer
179 views

Cloning Keeloq remote keyless entry system

Our house and a few other share the same gate, which is opened remotely by a 433Mhz transmitter. Unfortunately, we only get one remote per house, and we have two car. The company operating the gate ...
2
votes
3answers
325 views

Sequence multiple IR remote commands (button presses)

A bit of a story here: I would like to be able to quickly and easily turn on/off captioning on the cable TV box. Normally this would require 10(!) button presses. It's hard to be sure, but I expect ...
2
votes
1answer
212 views

Relay protection with MOV and RC Snubber

I am going to build a protection circuit for a 240 volt pump motor. It is believed that when the relay cuts out the motor generates voltage back into the relay and burns out the contacts. It has ...
0
votes
1answer
145 views

Can't get transistor to work correctly as a switch

What I'm trying to achieve: I have a 5V PWM signal that either needs to be left as-is, or converted into an analog 0-5V signal. How am I planning to achieve this? The PWM to analog conversion is ...
1
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3answers
190 views

Radio frequency signal transmitter

I lost the remote of an RC helicopter. I want to make a remote and know about the circuit. I am searching for this component which has three legs beside the LED in the pic. Would someone help me ...
1
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1answer
115 views

Activate garage remote via an Arduino

I have a RF remote control for the garage that I would like to control via Arduino. With a multimeter, I detected around 3v across the button. I have soldered two wired on either side of one of the ...
1
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0answers
154 views

How to switch a transistor when a radio signal is received?

I have a circuit which switches on by sending current to the base of one of its transistors. I'm trying to make receiver which can receive signals from a AM transmitter and send current to base of ...
0
votes
1answer
62 views

How to drive an ir sensor [closed]

I took apart a asus eee pc remote control and borrowed it's ir sensor to implement the remote using my arduino. I have a sketch I borrowed from ladyada so I can look at the raw ir signal. Since she ...
1
vote
4answers
205 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
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0answers
123 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
34 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
141 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
96 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
40 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
279 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
111 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
120 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
154 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
2answers
3k 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
votes
2answers
451 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
votes
1answer
101 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
412 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
230 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: ...
1
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1answer
957 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
192 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 ...