Questions tagged [infrared]
IR is electromagnetic radiation with longer wavelengths than those of visible light at 0.74 micrometres (µm) to 300 µm, which is extends the nominal red edge of the visible spectrum.
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IR frequency counter
I want to deign a frequency counter in this way:
A specific frequency (33 kHz) is radiated by an infrared transmitter from a distance of 10 m to the infrared receiver for 100 ms.
After amplifying the ...
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Contactless door bell circuit diagram
I am trying to make a contactless doorbell through a tutorial on YouTube.
I have a question about the circuit diagram. Won't the current polarity of the IR Tx and Rx cause the transistor to be in the ...
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IR LED Safety: Where does this OSRAM App note (AN090) formula come from?
The formula is from OSRAM application note AN090 "Eye safety of IREDs used in lamp applications":
$$ L_{ir} \approx \frac{I_e R(\lambda)}{Z^2} $$
In the app note, they don't give a reference ...
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How to know what kind of IR LED a device is using?
I have a remote from an expensive sound system just decided to go broke on me, and the people who made it decided it was a good idea that sound system can ONLY be controlled by the remote they ...
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Is this an LED or IR receiver?
I want to make a trigger for my project. I saw this PCB for triggering the RF part of the PCB. I think one PCB has an IR receiver and the other part has an IR transmitter so they can trigger the RF ...
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How to replace TCRT5000 IR sensor with TCRT1000 IR sensor
I've got a pulse sensing circuit based on the TCRT5000 IR sensor. Its working fine and I can easily see the pulse when finger is placed. But I tried replacing it with the TCRT1000 but there is ...
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Can't understand data transfer via IrDA on STM32
I am trying to communicate between two STM32-based devices using infrared light. The first device is the official STM32L0538-DISCO development board, the second is a Chinese mini board based on the ...
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Pulse sensor issues and How to get -5V from Arduino
So I'm trying to make a pulse sensor using TCRT5000 IR sensor and arduino UNO (giving out 4.8V really from 5V pin) (Baud Rate 19200), and I'm supposed to get a pulse plot like this
But I'm getting it ...
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STM32 update program without cable
What method should we follow when an updating code cannot be made with a cable to a PCB in a closed box? Is it possible to send another code(update) to PCB in closed box using IrDA? I couldn't find an ...
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Why is my code working in proteus but not when burned into chip?
I am using atmel chip and I have a problem with the code, I guess. Trying to make automatic light system. I am working with two IR sensors that should detect a person entering and leaving the room. I ...
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Circuit works with one phototransistor but not with another
I created a circuit board with an SFH 309 FA phototransistor that works as an IR receiver for a serial data stream of a smart meter (this works without any problems).
Now I've changed the circuit to ...
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ATtiny85 IR decoding/receiving issue
Apologies if this specific issue has been addressed before, but I've scoured for hours, haven't found an exact solution.
Goal: To decode IR values using an ATtiny85 and display them over a serial port....
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Patch into IR receiver output signal
I have a LED string lights that can be controlled with an IR remote (e.g. ON/OFF, blinking mode, brightness, etc.) and the circuit looks like this:
FYI the lights work like this: The U1 IC controls ...
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Infrared diode, phototransistor, and multimeter
I thought of creating a circuit for a light barrier. I got the required components: an IR LED diode, an IR phototransistor, an op-amp, a potentiometer, a blue LED, and resistors.
After much testing ...
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Choosing IR emitter and receiver for data transfer
I want to transfer data from a not far distance using infrared. There will be 2 separate PCBs and they will provide data transfer to each other. For this, I will use one of the MCP2120 or MCP2122 ...
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Is it possible to replace the flashlight LED on an ESP32-CAM board with an infrared LED?
I'm looking for a way to modify an ESP32-CAM board, specifically its built-in flashlight LED.
I want desolder the white LED and replace it with an IR LED. Is that possible?
Also, what should I notice ...
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Are false positives from (advanced) IR proximity sensors normal? - VCNL36826S
I am working on project where I am using an IR proximity sensor from Vishay - VCNL36826S.
This sensor is observed to give false positives randomly. As I am still trying to catch this rare event, the ...
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IR FM Audio Modulator 3.1 MHz Carrier
I'm looking to make a circuit that modulates an audio signal with FM into an IR led. This is going to be a makeshift version of one of these. I've seen a few FM IR modulators online before, but most ...
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How to extend useful life of IR LED and photodiode pair
I have an IR LED and photodiode separated by 3.5 cm.
In practice, these devices get damaged very soon. (Some people that use this circuit report this problem).
An engineer proposed to make them blink,...
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Different input voltages for IR LED and TSOP
I'm designing a circuit where I need to detect an obstacle in the front efficiently in ambient light at a distance not more than 3-4 cm.
For that I'm planning to use IR sensor system,
IR LED as ...
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IR LED Safety: Subtend Angle and Retinal Exposure Limit
The relevant formulas from OSRAM AN090 "Eye safety of IREDs used in lamp applications" with slight modifications :
$$ Z = (l + w)/2 $$
$$ \alpha = Z/d $$
$$ L_{ir} \approx \frac{I_e R(\...
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How to simulate non-invasive blood glucometer in Proteus?
I'm working on a project in which I'm trying to create a non-invasive blood glucometer using NIR light and a photodiode.
The glucose level is determined by the amount of light absorbed by the blood, ...
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IR remote code amplifier
I am interested in amplifying output mod signal of my tv remote in order to use a higher power led/vcsel. Now, it should be as simple as cutting the emitter led and putting a transistor that would ...
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Basic IR circuit question
I'm creating a basic IR circuit and trying to get a better understanding of its working.
What is the purpose of R2? and how would I calculate a new value for it if I was using a higher voltage supply ...
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IR LED current not adding up
I'm trying to power 8 IR LEDs in series with a resistor at 12V. The forward current is 100mA, forward voltage is 1.2V-1.6V.
$$R=\dfrac{12V-8\cdot1.2V}{100mA}=8\Omega$$
So my resistor should be around ...
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Detecting IR reflection of shiny sphere from a distance
I have a ball rolling along a grooved track and need to determine its speed. Typical speeds are in the range of 2-20 m/s. The balls are relatively shiny (think polished bowling ball.)
A common ...
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Why is my infrared receiver working on my Beaglebone Black but not my Raspberry Pi?
I have a TSOP4438 wired to GPIO pins of a Raspberry Pi Zero W and Beaglebone Black as shown in the diagram:
I'm trying to use this to control my Pi with an old Roku remote. I initially tried this ...
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IR LEDs draw too little current
I am trying to set up a simple circuit using the GPIO pins of the Jetson Xavier NX devkit. I am using the 5V pin #2 to power a circuit with two IR LEDs connected in series. I've noticed that the LEDs ...
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Vl53l0x ToF Sensor turn on without gnd
My ToF sensor turn on if I not connected its ground pin to common ground (I let it float). Why?
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Power efficient IR LED driver for ATmega328p
I want to use a high power IR LED such as a Vishay TSAL6200 with a 3.3V ATmega328P. Since an output pin of that MCU can provide 'just' up to 20 mA I can't directly connect that LED but have to connect ...
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Photo Diode Receiver
I have designed a 5KHz Photo Diode Receiver circuit that Consists of a number of blocks. first stage of this circuit is a TIA.
I have problem with DC IR Light (Like SUN Light), when sun light shine on ...
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Alternative to MLX90614 IR Temperature Sensor : ISB-TS45D?
Has anyone tried using the "ISB-TS45D Infrared Thermopile Sensor" for measuring temperature using Arduino or any other board. I have used the MLX90614 sensor but is is much costlier than ISB-...
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Specifications of infrared LED VX-301
During clean up I found an old pack of IR LEDs.
They were bought ~ 20 years ago from the German electronics retailer conrad.de. The order number is 185540, but unfortunately, the store doesn't know ...
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InfraRed receiver just works when measuring with multimeter
My air conditioner stopped receiving remote control commands.
Because it is very old, there are no spares.
The receiver board is very simple: 1 infrared (TSOP), 1 aluminum capacitor, some resistors ...
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Connect IR LEDs to PC via 3.5m audio jack
I have a pair of LED IR emitters like the ones shown below
I have connected them to my PCs audio jack but the IR is not turning on.
Is there any way I can get them to continuously emit for a head ...
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Can I use my old Sony Camera's Night Shot to detect shorts? [closed]
I have an old Sony TRV-14 with a built-in night shot mode for shooting videos in the dark. It is my understanding it works by using sensing infrared radiation which is also how thermal imaging cameras ...
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Rx of IR is not working with SSM3K37FSLF MOSFET
We are developing an IR circuit on our Device. The IR circuit which we are using is shown here, we are giving 2.5 V to the circuit and our controller also works on the same 2.5 V. Previously we were ...
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Photodiode square wave positive duty cycle lower and lower
I drive an IR LED with a 50% duty cycle square wave and receive its signal with a photodiode. If I take the photodiode farther and farther from the LED, the signal's positive duty cycle is lower and ...
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How to read IR333-A infrared LED datasheet
I am not sure about what voltage to use in my Ohm's Law calculations when using IR333-A infrared LED.
The retailer I'm purchasing from states they are "Approx 1.6V forward voltage"
https://...
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Synchronization of remote sensors
I have a project that involves multiple (5+) remote sensor units (custom PCB with a MCU, WiFi Radio, and sensor), that record data for a short test (<60 seconds). Each sensor records data ...
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How can I know if an IR LED (emitter) is working, other than using a smartphone camera?
I bought a lot of 5 mm, 940 nm IR LEDs like the picture below. I want to know if they are working or not. I tried the smartphone camera method, but I could not see the light. I have tested multiple of ...
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Drive IR laser from ESP32
my goal is to send 38kHz signal on IR laser (5V) (have 3 laser that takes 60mA, 120mA and 400mA). PWM signal that generates 38kHz goes from ESP32, so 3.3V 40mA max.
I will do short shots max 1-2s with ...
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Can I use DC-DC step down converter on infrared illuminator LED 5 mm, 940 nm [duplicate]
I was thinking if i use dc-dc step down converter on infrared LED 5 mm, 940 nm and The supply voltage for the DC to DC step down is 5 V from a smart phone charger then I will set it on 1.4 V exactly ...
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How to manipulate a PIR sensor?
The passive infrared (PIR) motion sensor detects movement of infrared light sources with wavelengths ranging from 7 μm to 14 μm. Is there a way to make it detect below 10μm or to make it detect ...
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Connect IR sensor switch to light up and turn fan on when detecting human
I want my store room light and fan to turn on or off automatically as people enter or leave the room. My current setup in the store room is a lighting control on off by the normal switch.
For the ...
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Using TSOP17 and 555 to measure distance
I am trying to design a simple circuit that measures distance.
I will use an IR emitter and an IR reciever photodiode, and just measure the time between the moment the pulse was sent and when it was ...
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Can't get Arduino output to work using IRremote Arduino library
I'm trying to send an infrared signal to my LED-strip-receiver, but no code makes the LED work (light.)
I have the IRremote.h Arduino library installed on version 1.18.15 and I found this example/test ...
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Feasibility of Design: Using a TLC555 to Oscillate Three IR LEDs at 37kHz (schematic, datasheet, and calculations included)
Thank you for reading this. This post has four sections: purpose; parts, values/models, quantities, and datasheets; schematic, calculations, and other relevant info; and questions.
Purpose
To create ...
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How to get the desired signal from a photodiode and phototransistor multisim?
The above is a visualization of an IR transmitter and receiver circuit I'm building. Sending a 2v and 1khz sine wave through a photodiode to a phototransistor.
The figure above shows the outputs I ...
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Detecting a location of the needle inside a cavity having multiple IR emitters , using IR Detector at the tip of the needle
I am working on a project where I need to find the location of a needle that has the IR detector at the tip of the needle.
These needles are medical suturing needles that would help us to detect the ...
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