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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65 views

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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IR sensor to control an electro magnet [closed]

I need some help, I don't know anything about electronics, I'm hoping to learn a thing or two. I'm working with my daughter on a school STEM project. The project is a little box with a door held up by ...
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29 views

Infrared transmitter and receiver's LED is not turning on

We recreated this circuit on Youtube, it is an infrared transmitter and receiver We have recreated this circuit in Multisim, but the LED U3 does not light up when we press the S1 button, we assume ...
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233 views

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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2answers
84 views

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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2answers
64 views

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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1answer
48 views

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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2answers
53 views

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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2answers
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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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1answer
51 views

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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1answer
39 views

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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1answer
55 views

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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69 views

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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1answer
59 views

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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1answer
58 views

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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3answers
107 views

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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61 views

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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1answer
81 views

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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2answers
76 views

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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0answers
134 views

Too many pull-up resistors?

I am building an interactive art project based on a large array of IR emitters and IR photodiodes -- there will be 240 photodiodes altogether. I know how to wire them to get the effect I want, and I'...
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1answer
42 views

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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58 views

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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2answers
72 views

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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1answer
86 views

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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2answers
87 views

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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58 views

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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1answer
96 views

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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1answer
53 views

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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2answers
124 views

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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1answer
65 views

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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2answers
114 views

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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1answer
61 views

Laser tag IR LED beam reflection problem

I built a laser tag gun using an Arduino,but there is a problem. When I use it indoors with lens or without I have beam reflections. If I shoot on the wall the reciever also claims a "hit." ...
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1answer
41 views

Appropriate power supply needed to power 15x 850nm IR LEDs

I have 15 IR LEDs that I would like to use as a floodlight for my exterior cameras. The thing is I have no idea how to calculate the total voltage and amperage needed. A single LED is rated for 1.7V-2....
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60 views

Simulate press on a rubber button infrared remote control with a Raspberry Pi

I'm stuck. I'm trying to use a Raspberry Pi to simulate a button press on an infrared remote control that uses conductive rubber buttons in order to control/automate a toy with Python. Really grateful ...
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1answer
67 views

Does my IR LED need a ground?

I have a circuit that connects an IR led to my Arduino. The positive leg goes to +5v and the negative goes (via a resistor) to a digital pin. However, I have since seen some pictures of IR circuits ...
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1answer
51 views

Power an Arduino Nano with the 5V port and use an LED

I have an infrared LED that uses the 5V port for power. However, I've read that you need to use the 5V pin to use AA batteries. Is it possible to wire the LED or the batteries to a different pin, or ...
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2answers
73 views

Why did cars switch from infrared key fobs to radio-wave key fobs? [closed]

Is an RFID key fob less likely to have its signal blocked? Or is it longer range? Or can it be made smaller, or cheaper? Also, how do infrared devices generate an infrared signal? With an infrared-...
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2answers
171 views

Standard pin out for 38KHz IR receiver to 3.5mm jack lead?

Is there a (rough) 'standard' for IR receiver 3.5mm jacks? I wish to use one of the many IR receiver to 3.5mm jack leads Ive seen for sale, however none mention the pin out. I'm sure all combinations ...
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2answers
44 views

Reading power supply value in the datasheet ; -0.3 V to 6 V ? ; Unclear

I am working on IR module and was referring to datasheet from Vishay. While looking at supply voltage it showed -0.3 to 6 V. I am unable to understand -0.3 V, how -0.3V can power the circuit. Then I ...
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3answers
747 views

Multiple infrared LEDs in parallel or series?

For a bird camera project, I would like to power 4 infrared LEDs from a Raspberry Pi as the light source for the Pi's NoIR camera. The IR LEDs (TSHF6410) have a forward voltage of 1.4V and a maximum ...
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0answers
96 views

How to overdrive a 5W IR LED for laser tag

I am a bit of a noob regarding electronics, but hey, I guess I need to start somewhere. Here is the premise: I want to build the Arduino Laser Tag Link: and all went fine until I stumbled upon ...
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2answers
146 views

Need help with break beam sensors for an art installation

I've been commissioned to create a piece of public art that fuses technology, light, and sound. The final piece must have six beams that can be broken and trigger musical notes. My first idea was to ...
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1answer
395 views

Getting IR signal from remote controller

I was trying to get a IR signal from a remote controller. I hooked the IR receiver to the oscilloscope and I got nothing. Then i brought the remote controller very close (~1mm far of the receiver) I ...
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1answer
68 views

How to read datasheets effectively to connect components safely?

I understand that many questions have been posted regarding datasheets, but I hope that you can help me with my question as well. If I want to know how many infrared LEDs (SFH 4780S) can be driven at ...
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2answers
552 views

Detect an IR signal with a photodiode to use it with a microcontroller

I am trying to detect an IR signal with a photodiode to connect it to my STM32F411 and use it as a trigger signal. The signal I send are two pulses at 500 kHz which looks like this: I am using a ...
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2answers
917 views

200 mA output from the Arduino digital output

200mA and 0.2V are needed to turn on a mid-IR LED. Given that the output current of each digital pin in Arduino UNO is 40mA, is sufficient current provided by simultaneously connecting 5 pins to the ...
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2answers
97 views

Need help with IR Transmitter circuit

I'm working on IR transmitter circuit. But R77 feedback resistor creating confusion about its working. I know it's acting as a current limiter to the LEDs but confused about its role in feedback. Can ...
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0answers
62 views

How to strobe high power led while maintaining constant current

I am trying to make a high power tv-be-gone. For those who don't know, it uses arduino or attiny to run through every IR power code for most tv brands. I have made regular ones that use several 5mm IR ...
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1answer
110 views

Need help with an IR demodulation circuit

I'm trying to reverse engineer a PCB and made a schematic. The bad thing is I only have PCB images from both sides, not the actual PCB. This PCB is used to detect a very small black object spinning at ...
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2answers
44 views

What is the highest possible optical output power of an SLED?

I am inquiring about this because I'm looking for a suitably high-power, large bandwidth light source for a fibre optic communication system I am designing. The distance the data will be required to ...

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