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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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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Sending parameter to STM32 using IR

Is it possible to upload parameters into the STM32 using one IR led and a photodiode? Let's say we read data from an environment with the help of sensors. However, for another environment, we need to ...
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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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What kind of sensor can sense Infrared radiation from any direction?

I am designing a device that uses a remote control with an infrared emitter and receiver. Originally I designed the device with a Tsop38238 but this sensor seems like it's better suited for a DVD ...
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Photodiode for PT2222

Recently I dropped my Bluetooth speaker remote and it stopped working. After testing it with remote control diagnostic tool (one of the cheap component testers from eBay that also decodes remote ...
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IR reciever somewhow being triggered by cell phone screen?

First time asking a question here. I am curious why the TSOP4838 ir sensor is acting eratically when my Google Pixel 2's screen is facing it. As you can see from the schematic, I have a 555 arranged ...
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2 answers
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How to increase range of IR emitter

I have an infrared emitter connected to a Raspberry Pi which allows me to send signals to my air conditioner so that I can turn it on / off / set settings etc. The problem with my current electric ...
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How to simulate the CNY70 IR reflectometer with TINA or LTSpice

How can I model the CNY70 IR reflectometer from Vishay (click here for datasheet) using TINA or LTSpice. In particular, I would like to simulate the circuit shown below: The 4pins on the left side ...
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140 IR LEDs at 30 MHz using a frequency generator

I need to blink IR LEDs at different Hz and I am going to use a frequency generator for that. The frequency generator is 30 MHz and that is the maximum I need to blink the LEDs. I was thinking to use ...
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What is the infrared controller in Nook Simple touch?

I got an old Nook Simple Touch from my brother and it worked before. But it has been covered with mold so I removed the plastic case and it still boots, but cannot respond to any of my touch. I found ...
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Why is the range on my IR emitter extremely low

I have built a simple prototype for a circuit attached to a Wemos D1MINI for a DIY thermostat application. I've confirmed that it works (I can turn it on and off from my software), when I hold the ...
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Reverse engineer a TSOP 1730 IR Receiver Module?

I'm trying to reverse engineer a small IR Receiver module to interface it to a new uC board, I'm designing for it. The original uC mother board got blown. It's for a mate who wanted to use the same ...
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Can we program our smartphone camera to detect the frequency and time period of IR light?

My use case is this: I am emitting morse code using a sole IR light source, and I intend to detect the frequency and the time period of the light source using my smartphone camera. Can this be done?
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How to calculate bias resistor values to drive IR diode

I'm creating a circuit to do communications via a digital serial infrared link. My requirements are for the link to support relatively high speeds (maximum serial bit rate is 4,000,000 bps or 4Mbps) ...
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Troubleshooting IR emitters using an Arduino

I've been trying to get an Arduino to replicate my air conditioner remote signal for quite a while and I'm almost giving up just based on how annoying this task is. First things first: The Arduino I'...

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