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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110 views

Infrared LED, color cover/dome interactions?

Might not be the best forum, but sort of at a loss of where else to try... I'm trying to find a cover/dome for an IR LED project that I'm working on. The only thing I've found so far is: http://www....
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663 views

Time of Flight vs. Infrared Distance Sensor

I am working on a project where I require a high-resolution distance sensor, millimeter to sub-millimeter preferred. From my experience, TOF sensors are a bit more reliable than IR distance sensors (...
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2answers
264 views

RPM measurement using interrupt

I am controlling the speed of the motor and measuring RPM using IR module. The method I used works fine (I rotated the motor manually). I am facing problems when I connect the motor to the power ...
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1answer
91 views

Thermostat for induction heater with small coil

I bought a ZVS 1000w induction heater I would like to control it with a thermostat in order to control the temperature of my steel piece. I hold the piece with a clamp and I don't want to put a ...
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2k views

What sensors to use to read gym machine selected weight [duplicate]

I'm trying to find a set of sensors (to build a solution) to determine how many weight blocks an athlete is lifting on the weight machine like this: I already tried this solutions: Put RFID tag on ...
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638 views

Why are most IR phototransistors slow?

Most NPN silicon phototransistors that I see (Everlight, Kingbright, etc.) have fairly poor rise and fall times, on the order of 10us. The best one I've seen so far is the QT Brightek QSD8T120B with ...
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57 views

Is the infrared sensor fabrication process(Using such materials HgCdTe, InSb, InGaAs) different from CMOS fabrication processes ?

I want to learn differences between Infrared sensor fabrication and standard CMOS IC fabrication. If I am not wrong, in standard CMOS fabrication Silicon is mostly used. But for infrared spectrum such ...
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145 views

What is the advantages of InGaAs infrared image sensors? [closed]

I am currently searching the InGaAs material for infrared imaging usage. I have read some papers about it. It seems a new one. But I can not get real advantages of it, yet. What is the basic reason(...
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131 views

What is the difference CMOS and CCD image sensors? In terms of Infrared spectrum [closed]

What is the difference between CMOS and CCD image sensor arrays? i.e working principles. Please consider in infrared spectrum. Which one's fabrication is expensive/ or cheap ? Which one gives ...
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1answer
129 views

Need to transmit 3 bits through window glass continuously

I have three water level sensors that will live outdoors, and three fancy-looking indicator lights that will be inside. I would like to continuously transmit the on/off state of the three sensors ...
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1answer
176 views

Resistor Values to switch a 100ma led with a on a 5v power supply with 2n3094a 3.5v base

I have a 100ma infrared led (1.2-1.4v), a 2n3904 transistor and an arduino-alike with a 3.5 and 5v power supplies, and 3.5v digital output. I tested my stuff driving the LED directly (with ...
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1answer
185 views

Why are ionization smoke detectors bad at detecting smoldering fires?

I have been doing some research on the differences between ionization and photoelectric smoke detectors, and main differences in their capabilities, seems to be their ability to detect different kinds ...
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137 views

How to Modify Arduino IR Recievers to detect Unmodulated IR?

I'm trying to find the easiest way to interface between an Arduino IR receiver and an IR flashlight. Yesterday I learned a lot from a question: Can Arduino IR Recievers Detect Signals from IR ...
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2answers
82 views

Can Arduino IR Recievers Detect Signals from IR Flashlights?

If one has an IR reciever module similar to this and a IR flashlight like this, would the IR signal be able to be detected by the module? If not then, why? From what I understand, these sensors don't ...
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3answers
552 views

Calculating a resistor for a transistor

I'm creating a circuit with an infrared led and a transistor connected to a gpio pin on a Raspberry Pi. I'm currently using 5v with a 40 omh resistor (4 10 ohm resistors chained) but I'm not sure what ...
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167 views

Transistor for 38kHz IR pulse amplification

I am trying to build a timer circuit in which I will send a modulated 38kHz (almost) signal to an IR Receiver (TSOP38238 in Arduino Nano) and I want to amplify the square wave to the IR Led to ...
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2answers
1k views

How does the PNP transistor in this IR receiver circuit work?

(source: https://circuitdigest.com/electronic-circuits/remote-controlled-light-switch) How does the BC557 PNP transistor in this circuit work? Based on the information about PNP transistors that I ...
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364 views

How do I drive pin 2 on my 555 IC low so the one-shot timer will fire, using an IR sensor in place of my pushbutton switch?

I have a basic one-shot timer circuit (shown below in schematic). If I press the button, it brings pin 2 low and triggers the timer one time for a period which with my cap is about 5 seconds. Use IR ...
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2answers
2k views

Purpose of 1 microfarad capacitor in IR receiver circuit

What is the purpose of the 1 microfarad capacitor in this circuit? The source webpage says: Output of TSOP1738 oscillates at the rate of 38KHz, which is applied to clock pulse of 4017. So we have ...
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2answers
72 views

Detect black/white at 150 mm

I'm facing a weird request. I have to build a sort of "encoder", to detect the direction and the rotation speed of a black/white wheel at 150 mm from my PCB. In the past I did a lot of this things ...
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1answer
88 views

Design of a proximity Sensor with Digispark MCU

I want to design a battery powered device that detects proximity (through an IR LED and a photodiode), and displays information on a small screen. As it is an autonomous device, it must be low-power. ...
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1answer
91 views

High speed IR connection [closed]

Are there any IR receivers/transmitters with speed higher then 4Mbps? As I found most parts are limited to 4Mbps, like LT1328 (photodiode receiver) and TFBS6711 (infrared transceiver)
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351 views

IR LED Detectable Range

As a part of a project at work I need to detect an IR LED of my choice (I was thinking about 1~3 W , 730 to 950 nm) from a distance of ~100 m with a camera sensor (was looking at IDS UI-3160CP-M-GL) ...
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1answer
40 views

Functioning of IR-Photodiodes

Do infrared photodiodes vary their resistance according to the strength of infrared radiation they receive? Or do they simply have some sort of HIGH and LOW state, meaning that they either let current ...
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0answers
164 views

3.5 male to IR Transmitter - Receiver [amplified] back to 3.5 female

Trying to recreate a DIY headphone with IR transmitter and receiver I already searched this is what I have found so far: 1.- http://www.instructables.com/id/DIY-Infrared-transmitter-for-iPhone-iPod/ [...
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1answer
60 views

Infra red remote control very short range

I bought a house that has a few LG split air cons. Whenever I want to use them I need to get like 2 meter close to them for the remotes to work which feels too short and annoying. These units are 10 ...
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1answer
150 views

How to detect obstacles (Tripwire with Laser, IR or similar)

Supposing I have a glass sheet 50cm x 30cm, with 10 holes (2 lines x 5 columns), with metal/plastic (i can chose) pins inside it. They can be flush (hidden in the hole) or salient (extending 2mm above,...
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1answer
77 views

Vehicle tracking and direction processing

Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...
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2answers
185 views

IR Barrier with a 555 [closed]

I'm trying to build an IR Barrier with an 555, a sfh4547 and a tssp58038. Here are the datasheets: http://www.ti.com/lit/ds/symlink/ne555.pdf https://www.osram-os.com/Graphics/XPic0/00209793_0.pdf/...
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0answers
93 views

Part identification: IR receiver

A family member's Bose Wave Music System has stopped responding to its remote control. The battery in the remote control has been changed and I've confirmed that it's emitting a signal (using the "...
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1answer
165 views

Android-Based Projector Remote Controller

I am planning to create an android application which is a remote control for projector. The android application should do the following: Control the Focus Ring of the projector using Stepper Motor. ...
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2answers
453 views

pir motion sensor sensor - working principle

I read about how PIR sensor works. It is written that it has two slots that convert IR energy to electrical voltage pulses. The working principle is to diff between the two slots and when the ...
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1answer
1k views

Measuring the angle to an object using IR sensors?

I would like to be able to use IR emitter/receivers to measure the ANGLE to an object. As far as I am aware this is how the Sharp IR distance sensors work, by using triangulation to measure the angle ...
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7answers
28k views

If Infrared not visible, why the red LEDs?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted? Is that ...
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0answers
132 views

soldering 5x5x1 high power SMD LED: anode, heatsink, cathode

I've got myself a high power SMD 850 nm LED, 650 mW radiant power. I need to use this non-stop for hours at a time. So I need to solder this to a heatsink to manage the heat. I've got 4 them, actually ...
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1answer
61 views

Understanding IR Sensor Module

I am having a IR Sensor Module which i had got in a Robotics kit. But it has a connector similar to RJ-45, I wanted to use it with my arduino and hence wanted to desolder that jack and use jumper ...
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1answer
892 views

How to measure RPM from vehicle tires? Wheel Speed Sensor

I'm looking for a Wheel Speed Sensor to use it with a Raspberry Pi project to measure RPMs from a vehicle tires, however, I can only found sensor devices that I can't use with vehicle tires, they are ...
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1answer
55 views

Detecting when an object with surface mount component? [closed]

We have a pcb that sits close to some hole. When something passes through ( at 2-5cm distance) we have to detect it. To me it seems that this area is still in the 90's . When I check my options, all ...
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2answers
588 views

High bitrate IR receiver (TSOP7000 replacement)

After a many days of research I turned to stack overflow once again to help me. I'm looking for High speed IR receiver circuit for laser-tag weapon. Requirements are High noise cancelation, high ...
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2answers
54 views

decreasing the range of an lnfrared emitter [closed]

this is probably a weird question that has never been asked... but I was wondering how/if it is even possible to decrease the range of a infrared emitter? here is why I need to know: I am playing ...
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1answer
473 views

What is the meaning of carrier out for an IR receiver?

I was looking to buy an IR receiver to decode my remote control and was looking at a catalogue at http://www.vishay.com/docs/49845/_sg2145.pdf. On page two the carrier frequency is mentioned as ...
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2answers
83 views

How to detect multiple digital sensor with one micro controller input?

I would like to connect multiple TSSP4038 sensors together in such a way that I only have one output (let's call it Y_out), if any of the sensors output is HIGH then Y_out is also HIGH (regardless if ...
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1answer
795 views

Can you get an infrared remote's signal modulation with an Arduino?

Let me preface that I am very much an electronics noob. I am decent with programming. I have an RCA L40FHD41 HDTV that I bought in 2010. I have tried using many universal remote with this TV, but ...
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1answer
514 views

Solid angle measurement conditions for radiant intensity specification in IR-LED's data-sheets

For some IR-LED's their data-sheets state Radiant Intensity and the conditions under which that number was obtained, indicating also which solid angle was used for the measurement. For example, this ...
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1answer
1k views

Interfacing IR RC5 remote with STM32

I am interfacing IR remote which works on RC5 protocol with STM32F405VG. I have a PCB where I am using TSOP 1738 to receive RC5 packets. I have connected the CRO. ...
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2answers
2k views

How to control IR led using ESP8266 (out pint at 3.3v) and MOSFET to obtain high IR range?

I have an ESP8266 circuit which must send IR messages via 5mm IR LED. During initial tests I used an Arduino with schematic below. The OUT_PIN high value was 5V. ...
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1answer
215 views

activity led in an ir transmitter circuit

Using a raspberry pi. I have an ir led transmitter. The attached diagram shows the circuit. I would like to add a low power coloured activity led that shows the circuit is transmitting. Where should ...
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1answer
546 views

PWM on phototransistor

I am pulsing the VDD with 50% duty cycle at a frequency of 188 Hz (PWM). I get some weird spikes on my output TP3. Am I missing something about phototransistors? Here is the picture of the IR circuit ...
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2answers
78 views

Turning remote control signal into audio

Is there a way to convert the IR signals from remote controls (for TV's, DVD players, etc.) into audible sound signals? There is a good circuit online, but it uses the CA3237E which is obsolete, so ...
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3answers
1k views

Powering ir led with a 9V battery

I'm using this break beam https://www.adafruit.com/product/2168 with an arduino. Currently both sides are are powered by the 5V from the arduino. I want to move the led half of the break beam to the ...