Sensor Forum - Recent Threads

Check out what's in the Steam Controller

stanto — Thu, 30 Apr 2026 22:43:21 GMT

[View:https://www.youtube.com/watch?v=hVRfie61QyE:640:360]

Capacitive touch, fancy joysticks, buttons and touchpads. There's even an infrared LED. Valve went all out.

I think the best part about it is that it's easily repairable. 7 torx screws and you're in!

where can I buy Snap connection electrode in mumbai.

manojroy123 — Sat, 07 Mar 2026 13:13:46 GMT

Where Can I buy snap connection electrode in mumbai. Bellow is the given electrode link. I wan't to solder it on PCB. Please share some link.

https://www.cngoochain.com/product/electrode-pin-to-snap-connect-adapters-tens-lead-wire-adapters-2mm-pin-to-35mm-39mm-snap-connector.html

Please also check the link bellow.

www.sparkfun.com/myoware-2-0-muscle-sensor.html

RE: where can I buy Snap connection electrode in mumbai.

rsjawale24 — Sun, 08 Mar 2026 15:50:21 GMT

Go to Lamington road in Mumbai and show the photo to any of the shops, they will guide you on which shop stocks the part.

RE: where can I buy Snap connection electrode in mumbai.

manojroy123 — Sun, 08 Mar 2026 05:50:57 GMT

Thanks I like the rivet system of using the clothing Pin. Very helpful of you of sharing the information.

RE: where can I buy Snap connection electrode in mumbai.

shabaz — Sat, 07 Mar 2026 19:06:31 GMT

Any local clothing repair/sewing store should be able to provide those. Normally sewn or riveted, but could probably be soldered with some effort.

Exploring Sensor Technology Applications in Real-World Projects – Glad to Join the Community

nickcarlo — Fri, 30 Jan 2026 16:00:22 GMT

Hello everyone,

I’m excited to be part of the element14 community and to join discussions around sensor technology. This field has always fascinated me because sensors play a critical role in modern electronics, from simple hobby projects to complex industrial and automotive systems.

I’m particularly interested in how different sensors (motion, proximity, temperature, and pressure sensors) are integrated into real-world applications to improve automation, safety, and user experience. Reading hands-on projects, tutorials, and case studies shared by experienced engineers here is extremely valuable for learning how theory is applied in practical scenarios.

I enjoy experimenting with electronics and embedded systems and often explore how sensor data can be used more efficiently through smart integration with software and connected platforms. Communities like element14 are important because they encourage knowledge sharing, troubleshooting, and innovation across different levels of expertise.

Alongside my interest in hardware and sensors, I also follow technology trends related to automotive systems and smart displays. I recently came across a useful resource related to Android Auto that may be helpful for those interested in in-car technology and media integration.

I’m looking forward to learning from the community, participating in discussions, and sharing insights as I continue exploring sensor-based technologies. Thanks for welcoming me here!

Does anyone know where can I get graphehe powder from house hold item.

manojroy123 — Wed, 28 Jan 2026 15:20:18 GMT

Does anyone know where can I get graphene powder from house hold item. Or maybe I can make graphene at home in small quantities. lts say 1 gram to 10 gram range. I have heard graphene powder has very electrical conductivity. I wan't to test it for copper electroplating.

RE: Does anyone know where can I get graphehe powder from house hold item.

manojroy123 — Wed, 28 Jan 2026 16:20:56 GMT

Conductive ink for copper electroplating. silver and palladium is very expensive. Looking or alternative which is inexpensive and can be product in large quantities.

RE: Does anyone know where can I get graphehe powder from house hold item.

shabaz — Wed, 28 Jan 2026 16:04:05 GMT

There was a BBC article that discussed household objects, but it might take you a few years to collect enough: https://www.bbc.co.uk/news/science-environment-11478645

RE: Does anyone know where can I get graphehe powder from house hold item.

HKPhysicist — Wed, 28 Jan 2026 16:01:44 GMT

It is just a newly discovered carbon crystal. Why do you need it?

You can tear it apart from an house hood pencil tip with sticky tape and see it under Electron Microscope; but what is your purpose?

RE: Does anyone know where can I get graphehe powder from house hold item.

dougw — Wed, 28 Jan 2026 15:39:35 GMT

I don't know of any household products that use graphene powder.

You can buy graphene powder on Amazon.

It is definitely highly conductive.

RE: Does anyone know where can I get graphehe powder from house hold item.

vmate — Wed, 28 Jan 2026 15:26:36 GMT

You will definitely not get graphene powder from any sort of household item, or be able to create it yourself in any way. You can get graphite powder maybe, but not graphene.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

heinej — Tue, 23 Sep 2025 07:41:54 GMT

Any vehicle? So the former "clap switch" for cars?

Some time ago, I had to computationally compensate a continuous strain gauge load cell in the ton range
against interference from approaching/passing trucks and forklifts. One should certainly consider a geophone or array microphone or MEMS microphone with digital signal processing
in one (at least two microphones (differential sound)).
In my case, it was a supplementary accelerometer (deep earth vibrations, Sub 5Hz) on the subframe
that enabled precise detection of interfering trucks.
Although the questions above exclusively concern signal conditioning, I would first use standard measurement equipment to understand the physics and acoustic facts, and then consider amplifying, targeted filtering.

I would have thought that vehicle-specific characteristic audio patterns would be discussed here first, Short-Time Discrete Fourier Transform (STDFT), and FFT, and object approaching speed determination using the Doppler effect?

How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Fri, 19 Sep 2025 05:47:51 GMT

Hello everyone,

I am working on a project where I need to detect the sound of vehicles (cars, heavy trucks) from a distance of around 100 m. The microphone will be placed in an open area on land, and the goal is to identify when a vehicle is approaching.

Currently, I am evaluating microphones like AOM-5024L-HD-R and CMA-4544PF-W, connected to a MAX9814 preamplifier module, with the output fed into an Arduino Uno ADC.

My questions are:

What type of microphone is most suitable for long-distance vehicle detection (100 m)?
How can I calculate whether the microphone output voltage will be sufficient for reliable detection at that distance?
Should I use additional filters (e.g., low-pass or band-pass) to separate vehicle sound from background noise (wind, people, etc.)?
Would I need a higher-gain preamplifier or a different approach (like a geophone or array microphone) for better detection?

Any advice, references, or design suggestions will be very helpful.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Tue, 23 Sep 2025 07:25:03 GMT

first phase of the project is to get some voltage level when any vehicle moving towards mic.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Tue, 23 Sep 2025 07:23:34 GMT

yes

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

heinej — Tue, 23 Sep 2025 07:20:03 GMT

Is it a real-time application?

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Tue, 23 Sep 2025 03:52:59 GMT

hi robogary,

thanks for your knowledge.
my first phase of project is to detect vehicle sound (ex: Innova car) from distance moving towards mic. output should be some voltage level and while moving towards Mic voltage level should increase.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Tue, 23 Sep 2025 03:48:45 GMT

Hi dougw,

vehicle like car or truck moving with different speed.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

abhishekks — Tue, 23 Sep 2025 03:47:01 GMT

hi,
electret condenser microphone.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

dougw — Fri, 19 Sep 2025 21:08:45 GMT

How fast are these vehicles going?

At idle some cars will be tough to hear at 100m, especially if they are electric.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

geralds — Fri, 19 Sep 2025 14:12:11 GMT

Hi,

it's a nice project.

Yes, 3. and 4. are important.

As well as beacon_dave mentioned, a parabolic reflector is also needed.

Here, look for some formulars and calculation tools:

https://sengpielaudio.com/Calculations03.htm

You can learn a lot of audio technics on this website.

I read this website since many years in my own projects.

An ultra-low noise preamp is obligatory because you need a hub of the signal about from -130... -120dB up to minimum -6 or better 0dB (0.775V), minimum, or better.

After that, a filter as well an ADC is needing.

You need also to answer, what you want, dynamics or electret microphone. Both have its pro. and cont.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

robogary — Fri, 19 Sep 2025 13:11:18 GMT

Very intriguing project ! With no experience myself with the signal processing portion, Id like to learn more by asking questions that hopefully the community can help with.

The microphone analog input of the sound source to Arduino has 2 properties: frequency bandwidth and amplitude. The amplitude for the Arduino input is 0-5v for 1023 counts. Your microphone detection of traffic at 100m is likely alot smaller amplitude than at 1m. Does the dynamic range of the signal provide digital resolution in Arduino , i.e. 50mV is 1 count ?

Traffic noise is likely low frequency- maybe as low as 30-50Hz, maybe to 500 Hz ? Analog filter would be good to get rid of unnecessary audio content.

Do you envision to scan the analog input as fast as possible, or interrupt to create sampling comparable to 1 or 2 kHz ?

I could be making this task way overcomplicated, do you have some example code or library to convert the digital samples to a frequency spectrum ? I expect this library would be significant.

I have played with a MSGEQ IC that uses a comparator ladder and filters to output bits based on frequency.

https://www.digikey.com/htmldatasheets/production/2071107/0/0/1/msgeq7.html?gclsrc=aw.ds&gad_source=1&gad_campaignid=120565755&gclid=Cj0KCQjw_rPGBhCbARIsABjq9cdKCctZg2WHu3NC_ZxKhzYaMPR5LzzfQyZzkXQYnzaytEZl5qho1fMaAieCEALw_wcB

The Arduino code needed to scan & demultiplex is straightforward, but you likely could not tell the difference between a truck at 100m or a duck at 1 m , without some knowledge of the frequency spectrum signature of the source.

Id like to understand more of the digital signal processing part, but particular to your project, maybe it better to focus on ground vibration for vehicle detection rather than audio.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

beacon_dave — Fri, 19 Sep 2025 09:59:30 GMT

Depending on the application, a camera with motion tracking algorithm might also be worth considering as an alternative.

RE: How to detect vehicle sound at 100 m distance using microphone and Arduino?

beacon_dave — Fri, 19 Sep 2025 09:52:45 GMT

If it is a narrow capture angle you could perhaps try a large diameter parabolic reflector with the mic placed at the focal point. It's surprising what you can hear with your ear at the focal point of a 2m+ reflector.

You might find moving the microphone closer to the source and monitoring it remotely, is easier though.