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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401 views

PIC - Problem in NEC IR Decoding in PIC12F675

I'm using PIC12F675 with internal OSC running @ 4MHz. I'm using MikroC Pro compiler version 6.6.2. To Decode NEC protocol, I'm not using Timer or Interrupt. I used delay command to make the code as ...
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Adapting an older schematic for use with recent components: How might this circuit need to change?

The schematic below is a bidirectional bluetooth-to-infrared serial device. Computer sends bits to device via bluetooth virtual COM port. Device re-transmits bits via 950nm IR w/ 38khz carrier ...
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237 views

Setting up a grid of IR sensors

I would like to design an nxn IR long range break beam sensors and place them on a table with receiver at one side and transmitter over the other Length of the table is 155 cm and width is about 140 ...
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64 views

multiplex multiple photodiodes to one transimpedance amp

TIA = transimpedence I have lots of photodiodes for barrier detection, I tested one photodiode with one TIA op amp, and it was OK 1) Now I want to multiplex multiple photodiodes for my project, and ...
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233 views

reading values from an IR receiver in a laser tag gun

I'm trying to mod an existing laser tag gun adding new features. To do this I need to "piggy back" on the guns IR receiver and read values from it using a microcontroller (in my case a microbit) ...
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106 views

How can I indicate that an IR LED is functioning without detecting its emissions?

I have salvaged, non-documented, IR LEDs. Without a datasheet I do not know how much current they can handle. I have run into this before: I confirm the LED is good with by viewing it through a ...
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56 views

IR emmiter and reciever layouts for custom sensor

I'm having a hard time designing a PCB for a sensor array that need to detect if there is a small reflective object (3-20 mm section) in the way. That object can slowly rotate around a shaft. I have ...
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26 views

Asking about resistors for a FreeTrack IR clip

I have been working on a project for a freetrack IR clip to use with some of my simulators, and I had a question regarding resistor values. The guide I am using is here, and it details the use of 30 ...
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195 views

Transmitting through IRDA as if its a native serial port. Possible?

I'm currently making a lazertag project that utilizes the standard UART data format for data I/O. Before I go make up another circuit board that connects a photo-transistor that senses a laser beam ...
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146 views

Replacing obsolete photodarlington with phototransistor

I've got an old circuit design I need to replicate, function wise, to fit into an existing larger design. Logic I can usually handle, anything with transistors starts to get me lost. My strength is ...
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59 views

Modulated IR for optical transmission of encoder data (TSOP 4840)

Some background: I am a mechatronics engineer and I have just recently started my first job out of university as an electrical engineer. I feel a little out of my depth but I wasn't going to turn the ...
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195 views

What is the maximum lumens an Infrared LED can dissipate?

I am planning to shoot a video under Infrared light and want to choose a ton of the right size so that the entire room is illuminated. I am on to build a separate circuit if need be for better ...
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Why IR remote waveform is a saw-tooth or am I measuring it wrong

The measurement circuit is as follows: simulate this circuit – Schematic created using CircuitLab The waveform looks like this in my measurement: Is this because I'm measuring it wrong and ...
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137 views

Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query

I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
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How do I determine eye safety limits for IR LEDs?

IR LEDs typically report wavelength and radiant intensity (mW/sr). There are many warnings abound on the internet and from other local engineers to be careful of eye damage, but I find it difficult to ...
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63 views

How Do I Make sure That IR Emitter signal Reached Receiver?

I am a trying to make a TV remote with one improvement that if the receiver doesn't executes the command, my remote should be able to broadcast the signal repeatedly until executed. The problem is ...
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Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
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Is smoke sensor safe for eyes / kids? [closed]

So I was researching stuff about smoke sensors and I may be paranoid but I was wondering if they were Safe for kids and in general , I read they had infrared LEDS which I heard were very harmful for ...
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How to measure body temprature and HBR with just one IR transmitter and receiver

I want to measure body temperature and heartbeat rate only with a IR receiver and transmitter. How could I do that? Is it an accurate method? Or I have to use IR temperature sensor for this.
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165 views

How can I predict the spread/span of a single IR beam?

I want to project an IR field across a 5 inch hole to detect if an object passes thru it like a mouse, a ball or other such object; say a 4 inch ball, how can I determine or predict the spread or span ...
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2k views

Eliminating or reducing the red glow from IR LEDs at night

tl;dr; my question is simply this: is there a way to hide a bunch of IR LEDs (for a night-camera) so they don't get such a red glow at night? Preferably not at the expense of the light output, but ...
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75 views

Adjustable brightness for IR remote signals

I'm using and Arduino, an IR Led, and a transistor to for sending RC5 signals (36khz). For the next step I need to be able to adjust the brightness of the signal, basically changing the range. The ...
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Can an IR blaster built-in to some devices damage appliances? [closed]

I once have a tablet (Samsung Galaxy Tab 3 GT-P5210) that has an IR blaster built to it. I sometimes use it to control the TV on our house if the remote is lost. Now, I don't understand that if I ...
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120 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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310 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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95 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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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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735 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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60 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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174 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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137 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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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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188 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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199 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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141 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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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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734 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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183 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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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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401 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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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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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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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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99 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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423 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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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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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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62 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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154 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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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 ...