Questions tagged [infrared]

IR is electromagnetic radiation with wavelengths from about 750 nm to 1000 µm, which is beyond the nominal red edge of the visible spectrum.

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STM32 Programming Using Infrared

I'm trying to program STM32 using IR Emitter and PT. While trying this, there is interaction between the programmer and the PCB, but since the signals rise late, I get an error before I can send the ...
harmonica's user avatar
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Snooping on an IR receiver with a microcontroller [closed]

I have got some PCB that has an IR receiver and processes that signal in a non-relevant way. I would like to intercept or snoop in on that same signal with an ESP8266, without affecting the original ...
Opisek's user avatar
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Need a IR Signal analyser to decode AC remote code [closed]

I want to build a IR signal analyzer to decode AC or TV remote control signals. The goal is to then emit these signals through a IR signal emitter driven by a Linux box. Admittedly I am not an ...
Sunny's user avatar
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TCRT5000 combined with ESP8266 ADC voltage divider

I have a circuit with a TCRT5000 that lets me detect proximity since the reflected IR rays will make the photo sensitive transistor conductive and will pull down the voltage below the 10kΩ resistor, ...
Besi's user avatar
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Hacking a vacuum fluorescent display from an old DVD player

I have salvaged this front panel from an old DVD player. It has a VFD and an IR receiver. The board runs on a PT6315 chip. I know the basics of electronics and Arduinos, but I am not an expert. I ...
Rajeev Jeganathan's user avatar
2 votes
3 answers
114 views

"Dirty" response from paired TSOP4838 IR receivers

I have connected the outputs of two TSOP4838 IR receiver modules using diodes to prevent reverse current. The idea is to mount them on a moving model vehicle at 180 degree orientation to one another ...
RickyBoy's user avatar
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Can infrared light pass through solid materials?

I have an IR sensor at about few tens of mm (millimeter) from a heating source (incandescent bulb or heating element.) The phototransistor in my sensor is lead lined but I guess it is sensitive to a ...
Iskander's user avatar
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81 views

555 Timer Delay on Trigger

I am trying to build a circuit which will have an IR sensor. The type of IR sensor is active high. I need to connect the output of the IR sensor to a circuit which will give low output when the sensor ...
kailash kumaravel's user avatar
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How can I tell if a camera employs active or passive infrared - or neither?

In brief; Is there some way to figure out if a security/web/IP camera is using passive infrared, active infrared or no infrared at all without opening up the camera? Details; My Mom is in a nursing ...
Jeffrey's user avatar
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Replace photo diode and phototransistor with an IrDA chip

We have a circuit that communicate optically with a symmetrical circuit (exactly the same circuit at the other side). The circuit is based on a phototransistor SFH 320, a photodiode ZTHI55WA-3-SGM, ...
Renaud's user avatar
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Is it possible to sense a temperature using an infrared LED?

Is it possible to make a remote thermometer using a standard IR LED as a transmitter and an IR receiver diode as a receiver? The range is about 5 meters. I know there are chips available for this ...
Michal Podmanický's user avatar
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IR emitter circuit not working

I am struggling with IR emitter circuit which should replace remote control for few devices. I designed some circuit and already made PCB which uses P-channel mosfets for 12V device control. As I am ...
michalo's user avatar
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How to find brightest point from no ir filter camera with visible light filter?

Can one find the brightest point in terms of IR (such as the sun or an IR led) from a camera with no-IR filter such as the rpi-camera 3 noir with an added visible light filter or similar, with ...
wandy rge's user avatar
3 votes
2 answers
267 views

I want to detect IR beam of 1064 nm from my rangefinder that will be at least 1200 m away

This question is different from IR sensors not working in sunlight because the principal difficulty is distance and because the sent signal can't be changed in any way All the sensors I am using are ...
defoxtrotalpha's user avatar
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2 answers
88 views

How can I sense Infrared Light properly to detect direction of Motion

I've designed the schematic below: Basically, I want to detect direction of motion at a door frame from the top to turn on or off a relay which is probably connected to lights. The phototransistors ...
CaveScientist's user avatar
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How to determine delay of sensor response after the stimulus event (with oscilloscope?)

I’d like to determine how long it takes a digital sensor to go low after the stimulus event (Ir break beam). I have no problem getting a trace from sensor: I can see it start to drop, the slope, ...
Playing with GAS's user avatar
1 vote
1 answer
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IR Jammer Circuit Diagram Confusion

I'm fairly new to electronics so please bear with me. I was looking for a new project and found a circuit diagram of a "TV Remote Jammer" online (https://shorturl.at/doGRW). This sounded ...
TantalumLG's user avatar
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Dali thermal DLC384 datasheet

I have ordered this chip DLC384 from Dali-thermal some time ago but unfortunately never received the electric pin-outs and usage description/interface description. I mailed them multiple times over ...
Slupry's user avatar
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2 answers
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How do I calculate the area 1.5cm away from a LED with a 120 degree beam?

I have a SMD2835 IR LED with dimensions of 0.28cm X 0.35cm and beam angle of 120 degrees. How do I calculate the irradiation area if it is e.g 1.5cm away?
HJR's user avatar
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1 answer
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On the understanding of signals from an IR detector coupled to a lock in amplifier

I have a CW laser which is modulated by an optical chopper rotating at 1kHz. The modulated CW beam struck a sample holder and the absorption signal is recorder via an Infrared Associates MCT detector. ...
Strelok's user avatar
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Using TSOP53456 IR receiver module to detect the presence of IR light

I'm doing a project using two ESP32-C3 microcontrollers and some IR LEDs and IR receivers to make a solution that would let me measure the time it takes someone to run some X distance. It works by ...
f0dor's user avatar
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1 answer
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Replacing pushbutton with sensor in 555 timer latch circuit

I want to make a circuit where there will be a photodiode which when receives infra red light from the IR LED for the first time, produces a high output and when it receives the light for the second ...
kailash kumaravel's user avatar
10 votes
8 answers
9k views

The LED is dead... Why?

I have one OSB4XNE3E1E IR LED datasheet I use a battery type Li-ion 18650 and it's 1200 mAh - 3.7 V. The maximum voltage of the battery is 4.2 V maybe "when full charged" and when I made the ...
Pcp115's user avatar
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2 votes
2 answers
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IR LED with transistor

I’m trying to design a IR remote controller. I tried to design IR LED driver. I designed this circuit for IR driver. I used ESP8266 for first test for IR LED. I used though-hole version of MMBT2222A (...
Grammerking's user avatar
2 votes
1 answer
208 views

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 ...
John O'brien's user avatar
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0 answers
108 views

How can I measure the radiant intensity of an infrared LED beam?

I made an infrared (850nm) light source with a LED and secondary optics to create an oval shape beam and I need to measure the radiant intensity in mW/sr at different angles. Practically to get a ...
Tom Ben Dan's user avatar
0 votes
1 answer
70 views

Delay ON signal from sensor (NPN)

I have sensor (slotted IR optocoupler) that has IR diode and IR detector (transistor), where emitter is connected to ground. On device side I have connector with 3 pins - Vcc, GND and signal line, ...
GregorK's user avatar
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4 votes
1 answer
229 views

Better Solution to Taping IR Emitter and Receiver Together

I have an HDMI Matrix switch, cable boxes and DVR in a central cabinet that services all of the TVs in my home. The matrix switch allows the sharing of the cable boxes and DVR between all of the TVs. ...
James P's user avatar
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2 votes
1 answer
209 views

Making a short range barcode scanner for model railways

I want to find out if it is possible detect and identify individual rolling stock of an H0 scale model railway using a bar code scanner. The biggest problem is the short distances there is only 5mm or ...
bask185's user avatar
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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. ...
AirCraft Lover's user avatar
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IR LED and Photodiode (G10899-01k) to make NIR sensor

I am working on a final project to detect glucose. I am using IR LED of 1200nm spectral wavelength and a photodiode (G10899-01k) of 500nm to 1700nm spectral range. I have used a transimpedance ...
J.Kirui's user avatar
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1 answer
54 views

Why do I have a voltage over the detector even when the emitter is disconnected from the circuit?

I have built this for a school project exactly as per the schematic. The voltage measured across the detector resistor is 8 V. However, even with the emitter disconnected,the measured voltage is the ...
Richard Westmoreland's user avatar
4 votes
3 answers
423 views

How can I use a PNP transistor as a switch in a 555 bistable circuit?

I am trying to understand how the PNP transistor configuration in this circuit works: It comes from this article: How to build a Simple IR Transmitter and Receiver Circuit using 555 Timer? I believe ...
RickyBoy's user avatar
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0 votes
2 answers
126 views

How to understand output of TSOP4838 IR receiver?

I am testing the output of the following basic IR transmitter/receiver circuits and not getting the result I thought I would. simulate this circuit – Schematic created using CircuitLab I have ...
RickyBoy's user avatar
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0 answers
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Quad IR pickup output inconsistencies

I've designed a quad IR pickup for a stringed instrument. The pickup works well, except that the output level of each string is different. Some strings (particularly the left two channels in the ...
violapwr's user avatar
18 votes
6 answers
5k views

Why is the bitrate of infrared smaller than the bitrate of WiFi?

Infrared has a frequency of 300 GHz – 430 THz, while WiFi has a frequency of 2.4 GHz or 5 GHz. As the frequency of infrared is greater than the frequency of WiFi, the transfer rate (bitrate) of IR ...
Muhammad Ikhwan Perwira's user avatar
0 votes
1 answer
106 views

Need theoretical understanding of basis of IR sensor design

Below is a cutout of the IR sensor part from a heart rate sensor schematic. I need to understand how this part has been designed, what is the basis of the choice of the two resistor values R1 and R2, ...
DribbleNibble's user avatar
-1 votes
1 answer
92 views

Can IR Sensor TCRT1000 and TCRT5000 operate at 12V? [closed]

I asked chat GPT, and it said TCRT1000 and TCRT5000 are not suited for ops above 5V. But interestingly I have read a research paper where TCRT1000 has been used at 9V. I would like help decoding these ...
DribbleNibble's user avatar
2 votes
1 answer
180 views

GP2Y0A21YK0F Sharp IR sensor not counting below a certain distance threshold

I'm building a self-navigating robot that uses IR sensor (GP2Y0A21YK0F model) with Arduino to navigate through a terrain, however during testing phase when I put my hand closer than 7cm it bugs and ...
melonade's user avatar
1 vote
1 answer
74 views

No light detected from 1310 nm IR optical transceiver AFBR-5813TQZ

I am trying to build a test application circuit for an AFBR-5813TQZ IR (1300 nm) optical transceiver. For now, I am only trying to verify that the transmitter works, so I have breadboarded the ...
Ahmad's user avatar
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0 votes
0 answers
101 views

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 ...
Hossein Ameri's user avatar
0 votes
2 answers
170 views

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 ...
Kafka's user avatar
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2 votes
0 answers
106 views

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 ...
InTheWorks's user avatar
1 vote
0 answers
62 views

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 ...
DrakeJest's user avatar
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1 answer
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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 ...
Tryingtogetsome's user avatar
3 votes
1 answer
134 views

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 ...
DribbleNibble's user avatar
1 vote
1 answer
506 views

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 ...
Vyacheslav Nizhegorodtsev's user avatar
1 vote
2 answers
113 views

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 ...
DribbleNibble's user avatar
0 votes
1 answer
146 views

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 ...
harmonica's user avatar
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0 votes
0 answers
105 views

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 ...
cerouno's user avatar
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