Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [remote-control]

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

"remote" means distant, and remote-controlling means "control" something from a distance, without any electrical or physical contact to the device-to-control. (Quite similar to Wireless... i.e. no-wire. However the term Wireless transmission commonly used for radio-waves).

However, a remote-control system not necessarily use radio-wave-signal, it can use infrared(IR)-signal, or many-other type of signal.

Just like wireless-radio-transmission, remote-controling also have similar steps, like 1. Input on remote controller by user-> 2. Signal-generation -> 3. Signal radiation or transmission -> 4. Sensing the signal on the remote controlled gadget -> 5. decode the signal -> action or required-change on machine.

388 questions
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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 anyone knows where I can get parts for simple RF…
Digital Brent
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Wouldn't putting an electronic key inside a small Faraday cage render it completely useless?

Am I missing something? The Engadget article Kia made a tiny Faraday cage to protect your wireless key from thieves says: Many existing keyless entry systems aren't secure, but few people are likely to replace their cars just to reduce the chances…
uhoh
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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 specifies: Stall Torque: 0.8 kg / cm What does…
bjarkef
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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 circuit – Schematic created using CircuitLab But…
Piotr
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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, the other is the main one in this shot that I'm…
Kristopher Ives
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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 this?
awithrow
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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?

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. That pair of wires is connected to the overhead…
davidcary
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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 Arduino. Update: Got the protocol figured out;…
Flambino
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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 the motor supply. Also not sure if they are the…
Javier Gonzalez
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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 exactly do these codes represent? How can four digits…
Filipe Nicoli
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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 brick which is a little inconvenient. I was…
Riley Lloyd
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Where is the antenna in this remote control board?

This is a PCB of a (radio?) remote control.
Fra Vilsoni
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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 have any device to program the esc's (even the seller hasn't mentioned about such…
David
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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 case, but same should apply to any uC with ADC…
Kamil Zadora
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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 ms pulse corresponds with a minimum motor rotation and a 2 ms pulse with a…
PlatonInc.
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