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Questions tagged [remote-control]

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

37
votes
7answers
69k views

What do I need for a basic RF circuit?

I'm looking for any resource that can help me build a very very basic RC circuit. I'm talking as simple as using RF to turn on/off an LED. The purpose of this circuit is for research and education. If ...
12
votes
3answers
16k views

How to measure current to a DC motor?

I'm trying to measure current to a DC motor on an RC car I took apart. The car is powered by 3 AA batteries and seems to be made of three different boards. Two of the boards are for switches and LEDs, ...
12
votes
4answers
28k views

Stall torque for servo, kg/cm?

I've recently bought some cheap TowerPro SG-50 rc servos from ebay. They seem to work quite well, and despite their small size they are quite strong. But how "strong" are they actually. The datasheet ...
11
votes
3answers
2k views

Capacitors and motors

Every RC car I've cannibalized has had a small ceramic capacitor soldered on to the contacts of the motors. What is the purpose of having this? What happens to the performance of the motor with out ...
10
votes
2answers
2k 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 ...
9
votes
3answers
2k 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 1 ...
9
votes
2answers
3k views

How do universal IR remote “codes” work?

It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold. What ...
9
votes
1answer
4k views

How to use an ESC

I'm new to RC related modules. Today I got my Hobbywing's Skywalker 20A brushless esc. Manual is here. I also have a brushless outrunner motor (HL3512) I don't ...
8
votes
3answers
2k views

What does n/o and n/c mean on a schematic diagram?

Okay so I have two questions. I am looking at a schematic diagram of a remote control for a toy car and I can't seem to figure out what the "n/o" and "n/c" components stand for that are attached to ...
8
votes
3answers
7k views

Why would an IR remote circuit use one resistor/transistor pair for each LED?

I've done some reverse engineering work on the protcol for a remote that... sucks. I'm replacing it with one of my own design, but while I've improved on the interface, the range and view angle of my ...
8
votes
2answers
28k 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 ...
8
votes
3answers
26k views

Algorithm for mixing 2 axis analog input to control a differential motor drive

I am looking for information about how to implement proper mixing of 2 analog joystick signals (X an Y axis) to control a dual differential motor drive ("tank like" drive) using a uC (ATMega328p in my ...
7
votes
2answers
4k 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, ...
7
votes
5answers
5k views

TVS diode before or behind resistor

The best way to protect AVR pin for me is RC filter and TVS diode but I don't know one thing. I've seen schematics where TVS diode was before RC filter like in first schematics. simulate this ...
6
votes
3answers
1k 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. ...
6
votes
0answers
154 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 ...
5
votes
8answers
9k views

What is the name of the protocol(s) used to let an automatic garage door opener know which button I've pushed on the wall control panel? [closed]

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. ...
5
votes
3answers
2k 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 ...
5
votes
2answers
809 views

Why IR remote waveform is a saw-tooth or am I measuring it wrong

The measurement circuit is as follows: simulate this circuit – Schematic created using CircuitLab The waveform looks like this in my measurement: Is this because I'm measuring it wrong and ...
5
votes
1answer
1k views

Sending a analogue signal?

I have this old Nikko Tiger 2 RC car I've been playing around with. At first I disassembled it and played around with the parts and my parts (motor controller++). But then I asked myself, can't I use ...
5
votes
2answers
1k views

Which are the input/output requirements of a 12V trigger interface?

For a personal project, I'm building a simple I/O control board for an audio module. This board has an MCU that implements all the I/O control logic, and some interfacing electronics as well. It will ...
5
votes
0answers
290 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 ...
4
votes
3answers
4k views

IR to audio converter (frequency and level)?

What kind of IR detector and converter circuit could be used to down-convert an IR remote signal (in the neighborhood of 35 to 45 kHz) into audio frequency signals (0.1-20 kHz) of the appropriate ...
4
votes
3answers
3k 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 let ...
4
votes
4answers
858 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 the ...
4
votes
2answers
363 views

Why don't my coil work?

I disassembled my old Niko RC car today. Thought I could play around with the parts. But what I can't seem to understand is the coil. The powersource of the rc car is a 7.2v NiCd 620mAh battery. And ...
4
votes
2answers
984 views

Reliability of servos

I am building an RC aircraft, 10kg weight range. It is supposed to perform long flights (20km+), so reliability is my main concern, mainly on servos controlling Flight control surfaces. How ...
4
votes
1answer
502 views

Solving the time constant in this specific circuit

I'm having some problems with this circuit from a tutorial website: When the switch is open, the LED is on. When the switch is closed, the LED turns off and the timer begins. After a while, the LED ...
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?
4
votes
1answer
2k views

Options For Controlling an RC Car

My friend and I are trying to design a remote controlled car and one of the aims is for the controller to be a smartphone. The original idea was, have a transmitter plugged into the audio headphone ...
4
votes
1answer
2k views

BLDC Regenrative ESC and LiPo [closed]

I am currently working on a project where I want to implement a Brushless dc motor (like the Turnigy C2226 - 1800kv) to run in-hub of an RC car. I need this entire project to be as lightweight as ...
3
votes
4answers
2k views

Arduino: Controlling a RC car remote

I have a Carson Reflex Wheel remote control for my RC car. It has two potentiometers, one for accelerating and one for steering. My goal is to control the RC Car from my PC by sending commands via ...
3
votes
5answers
231 views

Can adding a copper plane to the 2.4GHz antenna amplify signal strength?

Hello, I bought a 2.4GHz controlled RC car from a Chinese vendor. Under the car chassis, there is a 30mm x 20mm copper plane attached. Surprisingly, the customer's service team replied that "it's ...
3
votes
3answers
250 views

Yet Another question on using GPIO to short a remote push button

OK, I bought this little remote-controlled Ac outlet thing for $1. It controls 3 outlets via RF. I didn't realize it was RF at first, but I currently have my BeagleBone Black doing a bunch of home ...
3
votes
2answers
897 views

controlling canon camera

i have a canon EOS 550D and i want to control it from computer. i had good result with taking photos with an ir led, arduino, and multi camera ir control library but i want to control also focus, and, ...
3
votes
2answers
3k 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 ...
3
votes
3answers
816 views

tiny RC receiver for bristlebot?

I made a small bristlebot. my version can turn left and right using two vibrators and is controlled by an ATTiny uC. I would like to add remote control functionality so i'm asking what's the simplest ...
3
votes
3answers
702 views

Remote Control Design

I am want to design a remote control. All I need is the appropriate IR LED and the Receiver to use, that will yield optimal performance. i need real practical experience here. What is the best ...
3
votes
4answers
782 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 ...
3
votes
2answers
12k views

Activating Electronic Speed Control with Arduino

For anyone else looking at this, most of our problems seemed to result from not having the pulse range quite right. We eventually hooked our ESCs up to a standard RC controller and used an ...
3
votes
1answer
2k 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 ...
3
votes
1answer
194 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 ...
3
votes
1answer
99 views

How do remote access devices work without a cellular connection or internet

This is a sample of one such device i am talking about, i seen a wireless "external hard drive" like electronic at best buy that you can access movies from it without wifi and i have been constantly ...
3
votes
1answer
701 views

Connecting to external chip (device)

I want to create mobile app that will control some external simple mechanical device. I want to use bada wave s8500 for this purpose so have access to Bluetooth and WI-Fi. Now I'm looking for advice ...
3
votes
1answer
459 views

Rotation span of SparkFun ROB-09065 servo

Does anybody know what the rotational span of the ROB-09065 servo from SparkFun? And even better, is there a datasheet available anywhere?
3
votes
1answer
312 views

Electric circuit diagram proof check - simple

I'm completely new in this field (electronics, I began today) and therefore I am quite the newcomer and would like to know if I understood the purpose of the transistors and capacitors and the diagram ...
3
votes
2answers
853 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 ...
3
votes
1answer
3k 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 ...
3
votes
1answer
2k 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 ...
3
votes
1answer
1k views

Cruise control implementation

I am doing a project that requires that I implement a cruise control system on an RC car using a GPS for feedback. I have implemented PID controllers before, but this is a little bit new to me ...