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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29 views

IR LED Diming using PWM

I want to make an IR-led dimming circuit that will control by PWM what changes should I make in this circuit... It shouldn't operate above 5V (low power) and should not use current when it's not in ...
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55 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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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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31 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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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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61 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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48 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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61 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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57 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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36 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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166 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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56 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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91 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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139 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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63 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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320 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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623 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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Need help with IR Transmitter circuit

I'm trying to understand the working of 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 ...
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46 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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26 views

Need Help with the transistor configuration? Biasing methodology used in circuit?

I am confused about how this circuit works, the circuit is the instrumentation for IR sensor even I have never encountered the such biasing, the IR led is activated with the pulse of 150 us the output ...
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86 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
38 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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54 views

How to calculate the spectral irradiance of an array of LEDs?

Good morning, how can I calculate this equation? The LEDs have the following specifications: https://www.mouser.com/datasheet/2/143/EAILP05RDDB1-708504.pdf _ 12 LEDs; 3 second exposure; 20cm distance ...
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83 views

Is there any dedicated IR receiver IC with atleast 5 output pins

I want to know if there is any IC available that can decode an IR remote to its different pinouts or I have only option to program a microcontroller to achieve it.
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Remote's IR signal viewed in my phone's camera is flashing. Shouldn't it look steady with a 38kHz carrier frequency?

I know I'm missing something fundamental here, but you can imagine the Google results I get trying to find this out! Shouldn't my phone cameras recorded fps/exposure be way way waayy much slower than ...
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41 views

What is the range of an IR sensor in a prototype comparing to real life application?

I'm currently having a prototype which involve using an IR sensor for obstacles detection. But the results required a comparison of the range result I obtained from the prototype to compare it to a ...
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2answers
53 views

Headphone jack IR transmitter not working reliably

I'm working on a project to build a remote control app for some IR controlled toys like DeskPets, Robosapien, TOMY etc. including an IR transmitter that (hopefully) has a very high range. I built an ...
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31 views

Distance range IR sensor

What should be the distance between the object and the sensor (TCRT5000L), for sensor to be able to detect it? I foun in datasheet operating distance is 0.2 to 0.15mm, but it seems little to me.
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63 views

How do FLIR cameras work with multiple spectral image acquisition?

I am looking to buy a FLIR camera, but it is hard to get in contact with the company. I wonder if somebody already used, or has knowledge about my question, which FLIR cameras can capture images in ...
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35 views

Battery to AC conversion of faucet IR sensor

I bought this faucet which includes a hand IR sensor, but it's battery powered. I wanted to convert it to AC power using this excellent Video as a guide. Since it takes 4 AA batteries, I bought an old ...
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1answer
66 views

Missing modulation in IR signal?

I have a cheap IR remote control from Ebay (like this one) and I´m straggling with the modulation of the IR signal. I use an BPV11F photo transistor as receiver and I get this signal with my scope ...
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71 views

IR vision application [closed]

I'm trying to make an IR visible object tracking device. Is there any way to convert visible machine vision camera to an IR vision camera datasheet link: https://wiki.dfrobot.com/HUSKYLENS_V1....
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39 views

Trigger motion sensor

I'm trying to trigger a motion sensor on a door (for fun and to learn more about these systems) using Arduino based electronics (ca 5V, ca 50mA). According to Wikipedia, these sensors (PIR sensors, ...
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99 views

Would this photodiode sensor work better in series or parallel?

I am working on a photodiode small object sensor that detects and records signatures of objects passing through an array of photodiodes facing an array of IR LEDs. I am connecting the photodiodes to ...
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27 views

stm32f407: usage of PSC in IrDA Low-power mode

Finally, I received my stm32f407 board, and a sample USART C project. The project comes with a Stm32f4xx_usart.c file (not HAL driver). I want to figure out what ...
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170 views

Reflective optical sensor

I am working on a project that uses a TCRT5000 reflective optical sensor. Sensor datasheet is here I tested this sensor in a room, the voltage at the output pin is high it is above 2.5V. While ...
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97 views

What technique (ultrasound/infrared) should I use to detect seeds inside a fruit? [duplicate]

This fruit is simplistic as there is a thin skin surrounding it. Inside it is a tiny ball of liquid and that is where the dense seed forms. The is seed much more denser in comparison with the liquid ...
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1answer
44 views

Essential difference between normal irda mode and low-power irda mode?

guys, I'm learning stm32f401x mcu. All I have is an rm0368 reference manual pdf file. No mcu chip right now. From the manual, I learnt that PSC instead of ...
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145 views

Accurate way of measuring liquid volume with arduino [closed]

An Arduino project of mine involves measuring the amount of water that falls through a liquid dispenser. It is imperative that this value is EXACT since this will be used for further calculations. Now,...
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4answers
544 views

Reducing IR proximity sensor module power consumption

I have built a rechargeable automatic hand sanitiser using an IR proximity sensor(HW 201.) It consists of an IR proximity sensor module, TIP 32 transistor, 3-6 V DC pump, TP4056 charging module and a ...
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2answers
110 views

Help in understanding a IR repeater schematic

I'm relatively new to electronics projects, as a hobby. So please bear with me. I want to build an Infrared Repeater as a small project. I've found a component which I think will work nicely for the ...
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1answer
52 views

how to put Atmega328 to sleep mode and wake it up without button,without WDT

iam building a IR based faucet i need to include battery backup here iam using only ATmega328 with crystal and capacitor, iam not using regulator or LED ...i need to increase the battey life iam using ...
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4answers
934 views

How can I prevent my IR sensor from sensing the sunlight?

I want to use an IR sensor for object detection. An LED will be turned on if an object is detected. But because of sunlight, it's malfunctioning (i.e. always getting logic 1). So, how do I omit the ...
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2answers
304 views

Best power transistor for a high PWM output from ESP32

I need your advice whether to use a Tip122 Darlington transistor or a BD137 medium-power transistor Or a IRL3705 MOSFET to drive 10 Parallel infrared LEDs. Each LED has a forward voltage of almost 1.2-...
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2answers
126 views

Burn hazard of IR LED Array Question

I am performing eye safety calculations on a device and I have hit a roadblock. To perform the calculations I have been following the IEC 62471 "Photobiological safety of lamps and lamp systems&...
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1answer
96 views

Are IR LEDs placed under the same category as lasers?

I am creating a device which uses IR LEDs to illuminate the human eye, while an IR camera records the pupil dilation. From my research, I see that there are two standards which are related to the ...
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1answer
91 views

How does one calculate the spectral irradiance from an array of IR LEDs?

I would appreciate any help. The question may seem similar to the question asked at this link: Help me calculate spectral irradiance of an LED from a LED spec sheet , but the answer was never given or ...
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1answer
34 views

Wiring SIX IR_LEDS

I am trying to wire six IR LEDS with three parallel sets of two IR LEDS in series. Each set has its own current limiting resistor and they all share a common 5V line at their anode and are connected ...
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2answers
49 views

IR Leds to be Driven by Coin cell

Can a coin cell with rating >= 500 mAh be used to drive a set of 3 IR LEDs if each takes 100 mA forward current? I'll be drawing 300 mA (3 LEDs) current continuously from the cell, I heard that ...
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1answer
58 views

Problem in editing EEPROM of MLX90614ESF sensor , pic 18f4620 , I2C communication

I want to edit Tomax and Tomin in the EEPROM 0x00h and <...

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