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Questions tagged [remote-control]

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

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8
votes
5answers
6k 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 ...
11
votes
3answers
3k 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 ...
1
vote
2answers
879 views

Transfer function of three cascaded RC filters?

I am looking for the transfer function of three cascaded RC filters: I have found the solution for two RC cascades (components differently labeled): I need an analytical expression like this one for ...
1
vote
3answers
2k views

RC circuit as clock source

I am not understanding something very fundamental here , I have read that an RC circuit can be used as a clock source. From this I assume a DC input. Playing around with my oscilloscope the only time ...
38
votes
7answers
71k 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, ...
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 ...
4
votes
2answers
364 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 ...
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 ...
-2
votes
2answers
3k views

How can I clone an RF transmitter? [closed]

I have a gas fireplace that is controlled via a RF transmitter/receiver that operates at 303.8MHZ. According to the manual, each remote has a unique code (1 out of 1,048,576) that is set at the ...
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 ...
1
vote
1answer
805 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
vote
1answer
419 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 ...
2
votes
1answer
541 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 ...
2
votes
1answer
569 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 ...
2
votes
2answers
166 views

Switch from one battery to another when one is discharged/disconnected?

I'm trying to figure out how to switch source power from one battery to another when one is dead or disconnected. the circuit needs to be able detect the loss of power on the jettisoned battery and ...
1
vote
1answer
100 views

Find datasheet for an industrial radio remote control

At work, we have what seems like radio-based remote controls to control the window stores, the light and the temperature. We'd like to find out what the commands are that are sent by the remote ...
1
vote
2answers
714 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 ...
0
votes
1answer
597 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
2answers
113 views

How do I read a Board?

I have opened a remote and tried to read it. Quite tricky if I'm honest. I'm trying to replicate this DIY. On instructabels (Raspberry-Pi-GPIO-home-automation). http://www.instructables.com/id/...
0
votes
3answers
122 views

Voltage in an RC Circuit

I made an RC curcuit on a breadboard gave it a of 25V measured the voltage across it with an oscilloscope. During my experiment it has come to my attention that the peak voltage level was getting over ...