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

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20 views

How to make bluetooth based controlled toy car?

i have been exploring this, and i bump into this stand-alone module, http://www.seeedstudio.com/depot/Bluetooth-Bee-Standalone-p-1157.html , so i wanna buy it, but doesn't sure does it works like ...
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1answer
57 views

why discharging capacitor voltage in a rc circuit is positive? why it should not be negative?

During discharging, the direction of the current is opposite to the original current direction(source current).so the current is negative. likewise the discharging voltage direction is also opposite ...
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0answers
38 views

How can I calculate the noise in a simple RC high-pass filter?

How can I calculate the noise in a simple RC high-pass filter? (Assuming very low input impedance and very high output impedance.) I know the Johnson noise in the resistor should be 4kTR, but I'm ...
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0answers
58 views

Replacing an IR sensor with buttons

So i have this HI-fi sub-woofer control thing that only has remote control support and i have no remote and I've got no codes for universal remotes. tbh just some switches on the side would be all i ...
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2answers
66 views

Help building a scheme (involves L293D H-bridge)

I'm making a bluetooth-controlled fire truck for my son based on an old wire-controlled truck I bought at a yard sale. It didn't have its wire-remote. I already got Arduino Nano to drive 2 motors ...
0
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1answer
59 views

How to hook digital input to remote control buttons?

For a DIY project I would like to adapt a remote (RF) control to accept digital signals from MCU. I am not quite sure how the buttons in question work: Are they normal buttons which make near 0 ohm ...
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0answers
32 views

IR commands for shuting down television

I looked everywhere . But i could not find it . I did my ir remote control system for samsung smart tv. I am curios on are there any command to shut down television (it does not matter television on ...
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1answer
27 views

Emulating the start/stop button on the remote control of the iPhone

I need to build an (apparently) extremely simple device which is basically a pushbutton that pauses and restarts the playback on an iPhone. This is exactly what the central button does, on the remote ...
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1answer
43 views

Multichannel RF transmitter design for 315MHz and 433MHz

first time designing RF, so pardon my ignorance. I want to design a ASK/OOK transmitter board operating on both 315Mhz and 433MHz ISM band frequencies. I have a MCU onboard that generates the data to ...
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2answers
50 views

How do car trackers communicate?

So i was thinking, How do car trackers or long distance (over 100kms) remote control communicate to their central commands,? Do they use the cell phone network? what could one require to set up such a ...
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3answers
68 views

Calculating Fc (cutoff) of series to RC to ground on inverting input of non-inverting amplifier

Regarding the chosen answer for: How does this OP-AMP non-inverting amplifier work? The following circuit is given, and it says that $$F_c = \frac{1}{2\pi R_1C_1}$$ simulate this circuit ...
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2answers
86 views

Basic 12V Step-Start Circuit For Automotive Fans: Troubleshooting

To keep this short and sweet, I wanted to make a circuit/controller to decrease the inrush current on a large powerful fan for my race car. I ideally just wanted something that wouldn't let the amps ...
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1answer
77 views

RC debounce mosfet gate

I am trying to debounce a switch that controls the gate of a mosfet. Will the circuit below work, or do I need to re-arrange some of the parts? *The circle thing should have been drawn as a mosfet. ...
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3answers
813 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 ...
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0answers
14 views

Replicating a handheld gimbal remote control - communication problems

I have a handheld camera gimbal and a wired remote control (USB micro to mini). What I would like to do is replicate the button presses with a microcontroller thus automating movements. So far I have ...
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2answers
104 views

Linear Oscillator Frequency Problem

I was doing one of the problem sets when I stumbled upon this gem. I know that for oscillation to occur, the gain has to be greater than 1. The loop gain I computed is Could anyone suggest any ...
4
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4answers
390 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 ...
0
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1answer
45 views

Remote Control Program for ATMEGA168P circuit

Hello I will make maybe a fool questions. I have this diagram: This diagram is to turn on/off led lights, make blink via remote control. Now the questions are: 1.-What kind of remote control I can ...
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1answer
42 views

PIC 16F57 and T0CKI pin

I've been working on a remote control made out of a PIC 16F57. The PIC will wake up on every keypress, send the IR code and go back to sleep. the remote is working fine, unfortunately I forgot to tie ...
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1answer
76 views

Calculating RC oscillator frequency

I'm working through an old Popular Electronics article, trying to apply and learn some of the math behind the project. Math for the clock pulse generator frequency has me stumped; wondering if anyone ...
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1answer
68 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 ...
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1answer
73 views

Electronic hit detection

I'm building various r/c vehicles like warplanes, tanks, auto-turrets, etc. and I want to fit some of them with some kind of a weapon. I've decided an air soft gun is a good choice. So, mounting and ...
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0answers
46 views

Industry standard for remote monitoring of solar power generation

I'm a software engineer and I'm working on the code for a small device that will monitor the electrical production of an array of power conditioners (grid-interactive inverters) for a set of solar ...
0
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0answers
192 views

Long range RF transmitter and receiver

Recently I made some upgrades to my quadcopter and I would like to improve my transmitter/receiver range. Currently I can fly up to 1.5km far, which is not bad but I would like to fly about 8 km far ...
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2answers
98 views

How will the current move?

I hope I've come to the right forum about this... I'm planning on building an e-bike using RC components, except I'm not going to use a transmitter and receiver. Instead, I'll use a Servo Tester to ...
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1answer
41 views

Charging an RC circuit with two different Voltages?

I am giving step input voltages of value 10V and 5V to an RC circuit. Will it take equal time to charge the capacitor to its's final value? OR 5v will take more time to charge and 10v will take ...
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2answers
71 views

Generate TTL-level reset pulse from RS-232 level signal

(My knowledge of analog circuit design is severely limited). I am trying to generate a reset pulse for an AVR microcontroller. The reset is active LOW, and the maximum threshold voltage is 0.9V, with ...
0
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1answer
43 views

Ceiling fan speed control

I have heard it said that a ceiling fan with a built in three speed manual switch should be set on the high speed setting when using an electronic speed control. I have not found an answer as to why ...
0
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0answers
25 views

Reprogrammable Remote Power Supply Raspberry Pi Monitor and Control

I currently have a reprogrammable power supply (HCS-3400) hooked up to be controlled remotely from an control/monitor app provided by the power supply company, Manson. The supply is connected via USB ...
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1answer
96 views

Best approach for reverse engineering an RF Remote for a newbie

As part of a larger project, I would like to be able to replay signals of this remote. It's a remote for a temperature controller, operating at 433MHz and it looks like it's using ASK modulation. ...
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1answer
32 views

LED Remote, Isolating 2 channels

I previously had a simple remote that allowed me to turn the LED strips on my motorcycle on and off when parked, which then I also wired in a separate relay so that the strips turn on with the ...
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0answers
56 views

Use remote controller as keyboard matrix Arduino

I need to connect remote contoller directly to arduino without using IR channel, so just like a plain matrix keyboard. I guess that it is possible just connect remote lines and row to arduino directly ...
0
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1answer
141 views

Can any remote be used with an RC car? [closed]

I just bought this awesome H2 Hummer RC for $2 at a garage sale (the battery alone that was inside is worth about $100.). The motor works fine and the car is in excellent shape but it did not come ...
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1answer
99 views

Volume control?

Thank you for looking at my question. I have an electronics background from the military but I'm no engineer. I am trying to design a sound system with remote wired volume control in a chair. There ...
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0answers
99 views

Cannot get nrf24l01 working

Hi I have just started to study RF24 library for remote communication, I have two arduinos : UNO and Mega. I have connected this remote modules to them, also by this time I have soldered capacitor ...
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2answers
105 views

How can I connect a phone battery to TV remote control? [closed]

I have an old tv with an IR remote control. It has become quite bothering for me to change the remote control's batteries every other week. I thought to myself why not connect a Chinese phone battery ...
0
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2answers
59 views

ATmega32 withRC filter and OpAmp

In my circuit (picture below), ATMEGA32 output is connected to a RC filter (R=100K, C=10uF 63V) to non-inverting terminal of OpAmp (LT1006). OpAmp is configured as voltage follower (Buffer Amplifier). ...
0
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1answer
263 views

Is a 600+Hz R/C Servo/ESC refresh rate possible?

In the R/C multirotor scene, the trend at the moment is to have very high refresh rates on your ESCs (speed controllers). My understanding of how servos/ESCs are driven is a 1-2ms pulse is sent to ...
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0answers
415 views

Common mode RC filter of High-BW differential line

I'm using a fully differential analogue chain, using 20Hz HP, 3MHz LP and x2 Gain. My signal of interest is fully differential with a 200KHz fast modulation and a 100Hz sawtooth ramp. The high ...
0
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1answer
134 views

Is a toy's remote controller interchangeable?

This Christmas I'm buying a couple people remote controlled quadcopters. Then it hits me. Is there a possibility that the different remote controllers will crosstalk and wind up controlling a robot ...
2
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3answers
667 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
128 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
144 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 ...
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1answer
114 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
145 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
159 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
58 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
421 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
108 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
299 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 ...