Questions tagged [remote-control]
For questions related to the remote control of devices and the design of remote controls.
411 questions
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Need delay circuit to pull IC pin low for 10 seconds [closed]
For a RF project I use HT12D decoder. I have sensor with digital output. Whenever sensor value changes from low to high or high to low HT12Ds TE pin must be pulled low to enable transmission for 5-10 ...
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How does a remote controller know which button was pressed? [closed]
I disassembled one of my remotes to see what's inside, and saw that lines connected to different buttons connect to each other also. Whenever I use buttons in my own circuits, I connect each button to ...
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Help with infrared sauna circuit (remote power-on)
Good day, I am hoping to rely on you smart folks to help see if we can accomplish a specific goal. I have attached a pic of the circuit board from our infrared sauna. The sauna is in the basement of ...
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Can a blown step down module destroy the whole circuit?
I am currently building an Rc car which I designed myself.
Yesterday I started testing the whole system, including four motors (one in each tire), 5 servos (MGN995, 4 ontop the suspention, one ...
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Reverse engineering RC188 remote?
I'm trying to do a home automation project that involves a Decco ceiling fan. According to their website, that fan uses a RC188 remote controller. Due to WAF, I can't take the fan/remote apart. I'm ...
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Power calculations verification for a robot project
I am making a robot with the following components:
1 x L298N Motor Driver: https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf
2 x 12V DC motors (Medium Power, gear ratio of 74.83:1): ...
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What is the purpose of this table on RF remote controls?
On most of the RF remote controls we can see this table. Can you explain what it means?
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12 channel remote control: 4-pin IC for 12 buttons: How?
This RF remote control uses ev1527 encoder. Although this IC has just 4 pins for buttons, this remote control has 12 buttons. How they have done such thing?
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Capacitor in series with a button
I'm working on making my old Lift Master / Craftsman / Chamberlain garage door opener 'smart'. The original control panel uses two wires at 22 volts to control 3 functions - door toggle, light toggle, ...
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Should solenoid be connected to NO or NC terminal of RF remote to retract plunger end off of edge of tiny spring-loaded door so it can snap closed?
Remote-control nestbox bird trap. End of solenoid plunger will rest on edge of the tiny, spring-loaded trap door to hold it open until remote control is used to trigger solenoid to retract, releasing ...
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does rf remote transmitter power affect solenoid strength
Remote-control nestbox (bird) trap design calls for one 9V battery (pack with switch) boosted to 12V with MT3608 module to power 12V 433Mhz RF remote receiver, which is connected to a ZEY1-0530 ...
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RF receiver frizzes when start brushless motor
I'm trying to build a quadcopter with and Arduino, and I'm facing a problem, that is the RF receiver of the quadcopter freezes (not the Arduino) when I turn on the brushless motor.
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How to determine contacts to jump a SMD button on garage door remote?
I am attempting to control my garage door remote using a Raspberry Pi controlled relay. I have done this in the past with other remotes (i.e. the relay part is not an issue), but my new house's garage ...
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Is it possible to write a sinusoidal steady state response of a RC circuit with diode involved?
Let's consider this circuit. When everything is ideal and the forward voltage of the diode is 0. When the current is going forward, the time constant is R1*C. When reversed, it is (R1//R2)*C. Is it ...
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BLE interference from DC motors
The problem:
I am making a remote control car. The car is being run with a Raspberry Pi Pico W. The power source is a 11.1 V Li-po. The power to the Pico is being stepped down with a 5 V regulator. I ...
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Can you charge a multi cell LiPo battery only using the balance lead socket?
On a typical small LiPo battery charger like the one in the picture, can you charge a multi cell battery (like the one bellow) only using the balance leads without using the main/output charge lead?
...
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RC delay timer to power LCD
I'm looking turn on the power of an LCD screen from a Pi Pico with a short time delay (50-100ms) after the Pico is plugged in. I want to power the screen with VCC from the Pico (5V) and use a signal ...
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Charge Capacitor at 5V from 3.3V Microcontroller Pin
I must come up with a circuit that is able to charge a capacitor to 5V that I can drive through a GPIO of a microcontroller running at 3.3V. The capacitor is in a different device and has a leg ...
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Does it matter in sensorless BLDC motorcontrol if a motor is wired in delta or in wye configuration?
Let's say I am designing an ESC for a sensorless BLDC RC motor and I don't know it is a wired in wye or delta, does it matter? Delta doesn't have a neutral point. So if I would want to use BEMF for ...
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RC response for any given voltage [closed]
Lets imagine a simple RC circuit in which the response voltage is defined by the following equation:
$$
V(t) = V_{inf} \cdot (1-\exp(-t/\tau)
$$
This is only true when a constant voltage is applied (...
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Issues with unintended output activation in RF module circuit [closed]
I'm encountering problems with my RF module circuit for a cold pyro igniter using HT12E:
Unintended Flash on Power On:When powering the receiver, the output flashes without button press.
Continuous ...
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Custom radio modules/frequencies for ELRS
I'm trying to develop a custom RX/TX for UAV piloting on a non-standard frequency.
I tried decoding CRSF from the remote control, connecting to the S.Port etc., but without much luck.
I figured out it ...
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Control manipulator mechanical arm by infrared
I want to make an infrared control circuit (remote) connected to the Manipulator Mechanical Arm. I found this circuit, but the outlet is 230 volts, and I do not think that the arm will handle this ...
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Trouble understanding resulting bode plot while getting hands on filter design
Recently tried to get hands on filter design, I tried to design à simple low-pass RC filter as shown here.
simulate this circuit – Schematic created using CircuitLab
Cutoff frequency must be \$\...
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Voltage Sag in Li-ion batteries, And how to reduce them
I have 3 18650 Li-ion cells connected in series. Each have a capacity of 2200 mAh and can discharge at 10C. First of all , tell the maximum amps I can draw from them. If I am not wrong, I can draw 22 ...
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Unphysical voltage in SPICE simulation
I was exploring a lumped approximation of a distributed RC network (sort of a lossy RC transmission line/ladder network).
Everything made complete sense until I observed the voltage "gain", ...
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Designing a Delayed Load Switch Circuit for Voltage Transfer on a PCB
I am seeking guidance for the design of a circuit on a PCB board. The intended function of this circuit is to facilitate the transfer of a 24 V voltage from the input to the output through the ...
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Differences between "Dark Current", "Sleep Current" and "Quiescent Current" in automotive related products
I am from automotive electronics tier 1 manufacturing company which makes Automobile locks and Remote keys.
In our remote keys, our team uses the term "Dark Current" for the default current ...
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How to generate a single pulse circuit without using any MCU? [duplicate]
I have a 5V supply to turn my circuit on, and i need a one pulse circuit. The condition should be look like this;
When the circuit energized with 5 V it should go low after t1 time and it should stay ...
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Introducing RC Filter to reduce noise
I have designed a constant current circuit using an opamp.
If I want to implement an RC filter to reduce the noise, where can I add?
Option1: I am planning to add between the inverting terminal and ...
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How to draw the curve of the charge Qc
How to draw the curve of the charge Qc as a function of time for an RC circuit, whose capacitor is initially charged and without source, when closing the tap
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Homemade Doorbell - Issues with transistor and battery
I'm making a doorbell and i've tested it on my breadboard where it works perfectly fine. However, when I transfer it to a soldered circuit I have some issues. The switching of the transistor is ok, ...
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Why isn't this IR NEC signal being accepted by the receiving device?
I'm trying to transmit an IR NEC signal to a portable air conditioning unit. I have the remote control that came with the unit, and it appears to use the NEC IR protocol.
I've setup a receiving ...
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Need help to find the natural response of an RC circuit
Here is the question I am trying to solve:
I am stuck with the point that I am not sure Vo is found as -50v or +50v. Another issue is that Ic(t) is calculated by derivative formulas or another simple ...
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Why are most of the LED lights for living dimmable just by their remote (they do not work with a wall dimmer)
I am trying to replace the lights in the entire house with LED lights with a more modern style like this one https://www.amazon.ca/dp/B09582MM2J. They all use LED strips and they say they are not ...
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TP 4056 + XL6009 for RC cars
Good afternoon.
I use 18650 to power the radio machine. An XL6009 is connected to the output of the TP 4056 board to receive 5V, and then these 5V are fed to the machine board. But you press start on ...
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Combining multiple motor controllers into one
This question is in continuation of my earlier question.
I have four motors with individual controllers connected as shown in the diagram below. I would like to create a controller that can control ...
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Does the remote control we have at home work with infrared (IR) frequency?
Picture source.
I was told by my AC's technician who several times came to my house to fix my air conditioner, especially if it got problem with the remote control or the board on the AC equipment. ...
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RC timing circuit using a 2N3904
I have a 12VDC source driving an LED thru a 2.4K resistor. When a 12VDC control turns on I want power the base of a 2N3094 thru an RC network to drop the LED voltage to 0 in .5 to 1 second. I ...
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Terminated RC filter
Few days ago I asked in another thread if there was an easier way to get an expression for a transfer function of the circuit shown below in a form H(w)=H(0)*N(w)/D(w).
I wanted an analytical ...
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Can I use a power bank which shows output as 6V 9V 12V to run an RC car which uses 6 AA batteries? [closed]
I'm currently stuck at home and found an old RC car which uses 6 AA batteries. Buying new non rechargable batteries everytime i play with it is gonna be heavy on the pockets. I thought maybe if I can ...
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AC Source RC Circuit Differential Equation
I have to find the differential equation to this circuit and I have been stuck for two days. I have tried: KCL in loop 1 and loop 2 but I don't know how to do the current through the inductor as Vi(t) ...
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Can I modify a toy RC transmitter?
I'd like to modify a cheap supermarket RC toy car to go reasonably slower for extended run time and easier control. (would be present to a kid) I have not bought or even selected the toy in question, ...
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Hacking an RC car controller using an Arduino to electronically control an RC car from computer [closed]
I want to control an RC car from my computer so I can link my RC car with my racing wheel and pedals. To do this I was planning on modifying a dumbo X6 controller and connect an Arduino to it by ...
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Adding external parts with heat sink to increase max current of SimpleFOCMini driver (DRV8313)
Question: Is it easily possible with some external MOSFETs or similar things to increase the max current the DRV8313 can handle per phase of a 3 phase BLDC motor? Will be 3 parts enough, or would I ...
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Using an RC delay circuit on an NPN BJT base
I have a limited knowledge about BJTs used as amplifiers, but I know there is a voltage regime where the BJTs amplify, below saturation. I am wondering if I put an RC delay circuit on the BJT's base ...
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New Idea: On/Off Remote for iPad - but iPad can't boot! Suspect SENSE
I am installing a mini remote controlled switch in the iPad 8th Gen. The ideas is to be able to cut the power to the iPad at the battery using a remote control.
1st attempt:
I wired up the remote ...
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Power circuit for 3 AA batteries for ATtiny85
I'm using an ATtiny85 and 3 AA batteries in series to create a DIY remote control. Does anyone know what kind of circuit I need to safely and correctly use the batteries? I assume it'll need some ...
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I need help understanding a Chinese datasheet on an IR remote IC
I have a remote for a sound system sub woofer (a quite expensive, set I would say) with 16 buttons and half of them suddenly stopped working. A broken remote is not usually the end all, but the people ...
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What is the name of this connector and where can I find it?
Any ideas on where I can locate this connector? It is from a bike light and connected directly to 18650 battery. 3mm x 2mm with 4 holes, but 2 wires from the battery. On the motherboard the connector ...
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