DevHeads IoT Integration Server•15mo ago

Hello all, Any idea from where I can get better hands-on experience in RPi bare metal? Wanted to le

Hello all,
Any idea from where I can get better hands-on experience in RPi bare metal?
Wanted to learn from scratch, one of the colleague suggested try RPi bare metal - printing Hello world on RPi baremetal, then I'll get better idea about device drivers, cpu, systick, any other topics.
Thanks in advance for your help!

Dũng•10/19/24, 1:56 AM

Hello all,
I want to use an adc ic to get audio data from mic but i don't find any suitable ic, can anyone help me in this problem?
Thanks all for your help!

DDũng Hello all, I want to use an adc ic to get audio data from mic but i don't find a...

techielew•10/19/24, 5:29 AM

@JeremyCook @aymen ammari have you all been working on similar systems?

Ddino Hello all, Any idea from where I can get better hands-on experience in RPi bare...

techielew•10/19/24, 5:31 AM

Oh there should be plenty to help out with this, DINO, but @Umesh Lokhande would probably have a good idea of where to start or some sessions we may be able to put together around the topic since he's built training sessions on Pi before.

Otherwise @wafa_ath and @Renuel Roberts have Pis.

Do you have a Pi of your own? If so, which one?

Ddino Hello all, Any idea from where I can get better hands-on experience in RPi bare...

Umesh Lokhande•10/19/24, 6:11 AM

Here's a playlist to learn bare-metal programming of RPi https://www.youtube.com/playlist?list=PLVxiWMqQvhg9FCteL7I0aohj1_YiUx1x8. Personally, I'd prefer PICO over RPi3/4/5 to learn bare-metal. If you're a little bit experienced then maybe it's fine to choose regular RPi.

Ddino Hello all, Any idea from where I can get better hands-on experience in RPi bare...

Renuel Roberts•10/19/24, 7:25 AM

https://www.valvers.com/open-software/raspberry-pi/bare-metal-programming-in-c-part-1/

http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/

BMC Part 1 - Getting Started - valvers.com

Various information about engineering and computing things. Just tid-bits from an enthusiast

Ddino Hello all, Any idea from where I can get better hands-on experience in RPi bare...

Marvin•10/19/24, 8:01 AM

If you are up for an adventure https://github.com/s-matyukevich/raspberry-pi-os or the Rust version https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials

they go well into building drivers.

GitHub

GitHub - s-matyukevich/raspberry-pi-os: Learning operating system d...

Learning operating system development using Linux kernel and Raspberry Pi - s-matyukevich/raspberry-pi-os

GitHub

GitHub - rust-embedded/rust-raspberrypi-OS-tutorials: :books: Learn...

:books: Learn to write an embedded OS in Rust :crab: - rust-embedded/rust-raspberrypi-OS-tutorials

Ttechielew Oh there should be plenty to help out with this, DINO, but @Umesh Lokhande would...

dinoOP•10/19/24, 8:03 AM

I have RPi3 and 5

UUmesh Lokhande Here's a playlist to learn bare-metal programming of RPi <https://www.youtube.co...

dinoOP•10/19/24, 8:05 AM

PICO is a controller, I am currently learnig bare-metal for Nucleo L4 series via udemy course.
Wanted to learn and explore processor bare-metal to strengthen the concepts of processors.

Thanks for the help @Umesh Lokhande !
Dhanyawad!

MMarvin If you are up for an adventure https://github.com/s-matyukevich/raspberry-pi-os ...

dinoOP•10/19/24, 8:09 AM

Never tried Rust

, will follow the first link.. looks interesting..

Thanks @32bitSaviour !

Ttechielew @JeremyCook @aymen ammari have you all been working on similar systems?

JeremyCook•10/19/24, 12:49 PM

@Dũng I don't know that I've ever set up a microcontroller to record audio (just play it back), but I believe there are a lot of chips/boards that are capable or such operation. Searching around, here's one example with a Raspberry Pi Pico/RP2040 https://www.electromaker.io/project/view/raspberry-pi-pico-audio-recordplaywav-file of doing what I think you want to do, though there are a few external components involved. Also, IIRC, the RP2040 uses storage on an external chip, so you would need that available.

Or if you mean just responding to keywords for IoT control etc, I believe there are a lot of examples with Arduino Hardware, such as the Nicla Voice: https://docs.edgeimpulse.com/docs/edge-ai-hardware/mcu-+-ai-accelerators/arduino-nicla-voice

There are definitely options, but where you go depends on the project specifics.

Raspberry Pi Pico Audio Record, Play, Wav File

This project has been designed to be a very simple and easy to understand, audio recording and playback system. Using a Raspberry Pi Pico and C programming language. It has the added facility to also save WAV formatted files, which can be played directly on Linux, Windows & Mac OS.

Arduino Nicla Voice | Edge Impulse Documentation

shin-de•10/19/24, 2:46 PM

for basic web development, should i learn java script or just go with python flask,html?

ke7c2mi•10/19/24, 5:03 PM

Any DSP nerds around?

I've been messing about with concepts related to 1 bit ADCs recently out of some curiosity

In playing around, I realised that when we are dealing with 1 bit signals, the and operator and multiplication are orthogonal i.e.

0&0 = 0       0*0 = 0
0&1 = 0       0*1 = 0 
1&0 = 0       1*0 = 0
1&1 = 1       1*1 = 1

0&0 = 0       0*0 = 0
0&1 = 0       0*1 = 0 
1&0 = 0       1*0 = 0
1&1 = 1       1*1 = 1

Now for a mixer, we want to multiply some signal, by some LO complex signal, and get the output mixed complex signal

So - the question becomes:

If I take a PDM (pulse density modulation) signal and LO, and

them together - do I get a mixer.

The answer seems to be yes..

This is a little side tangent from a project where I am trying to make a 1 bit SDR, now I think I need to add as a stretch goal trying to make a digital mixer like this

In theory, I can take a 1 bit signal into LVDS+ on an FPGA LVDS channel and inject whatever noise or signal on the other signal. To just make PDM, we want to put white noise in there, that works fine. But this tells me maybe there is an opportunity to make a mixer feeding PDM signals in instead of noise.

I wonder if anyone tried something like this or has some thoughts related to it. There is prior art for simply making 1 bit ADC using FPGA channels but I haven't found any literature related to this.

P.S. there are a lot of harmonics - they are mostly from the 1bit conversion and can be mitigated to some extent with MORE NOISE, I am ready to find out that even though it can kind of work, it cannot work well enough to ever be useful, but where is there is too much fun finding out the hard way

Abdullah•10/19/24, 5:14 PM

I have connected the arduino r4 wifi to the iot cloud arduino. How can I change the password and email without changing the code? Can you help me?

Kke7c2mi Any DSP nerds around? I've been messing about with concepts related to 1 bit AD...

techielew•10/19/24, 5:43 PM

@Navadeep may have something to add

nour_oud•10/19/24, 7:35 PM

Friendly Reminder about the Upcoming Event
https://discord.gg/J3qdZNg9?event=1287418889134805063

Abdullah•10/19/24, 9:13 PM

Can someone help me? I am using arduino uno r4 wifi. I want to change the wifi semi via iot remote arduino or blynk app. I am tired of searching. I did not find a clear way.

Original message was deleted

techielew•10/19/24, 9:15 PM

This is a warning; put this type of post in #jobs. I am deleting it.

UUmesh Lokhande You don't need to modify any file. All you should do is edit your code with upda...

Abdullah•10/20/24, 2:22 AM

Can you explain this method to me more or send me a blog or a video clip that explains it, where do I get the OTA file from and how do I make it support arduino uno r4 wifi and how do I enter the wifi network name and password? Please, I really need this. I want to change the wifi network name and password on blynk or iot remote arduino through the phone application

MMarvee Amasi Yes very possible

Abdullah•10/20/24, 3:55 AM

how ?

kristof-at-embeetle•10/20/24, 9:56 AM

Hey everyone,
check out my experiences at the Hong Kong Electronics Fair:

kristof-at-embeetle•10/20/24, 9:56 AM

https://embeetle.com/#blog/hk-electronics-fair

Kkristof-at-embeetle Hey everyone, check out my experiences at the Hong Kong Electronics Fair:

techielew•10/20/24, 2:22 PM

Are you back in Belgium?

techielew•10/20/24, 2:30 PM

Hey @Event Pings and @Middleware & OS get ready for today’s Engineering Hour on message queues and intertask communication in FreeRTOS! It starts in 30 minutes here: https://app.livestorm.co/devheads-community/devheads-weekly-office-hours-1

What questions do you have for Umesh?

DevHeads IoT Integration Server

Engineering Hour: Message Queues & Intertask Communication with Fre...

PLEASE JOIN AS A SPEAKER IF YOU WANT TO PARTICIPATE IN THE DISCUSSION!Join DevHeads meetups to connect with other DevHeads and riff on a variety of topics for 30-60 minutes. Join here: https:...

Fatogoma•10/20/24, 4:36 PM

Hey guys,it's a pleasure to join your community.I'm embedded system engineer ,want to learn and share experience.

FFatogoma Hey guys,it's a pleasure to join your community.I'm embedded system engineer ,wa...

Camila_99$$•10/20/24, 4:38 PM

Welcome @Fatogoma !

CCamila_99$$Welcome @Fatogoma !

Fatogoma•10/20/24, 4:39 PM

@Camila_99$$ Thank you.

Kke7c2mi Any DSP nerds around? I've been messing about with concepts related to 1 bit AD...

Navadeep•10/20/24, 5:26 PM

That's a quite widespread(or lets say broadband ;)) question - interesting play you're into.

As I understand you want to make a 1 bit SDR having PDM signal generated again from a 1-bit ADC. Now you want to mix it with a LO which was fine, but also want to take PDM signal as a mixing reference?

If wanting for a SDR, how about converting your PDM with a low-pass filter or a CIC filter in digital logic implementation.

NNavadeep That's a quite widespread(or lets say broadband ;)) question - interesting play ...

ke7c2mi•10/20/24, 8:22 PM

So why this is interesting is it implies I could mix digitally before conversion - I already have a pipeline established that can do nyquist zone selection and down conversion - but I have to do a bit of downconversion before the data is at a rate that I can run filters on it - that part of the chain is not flexible

If I can digitally mix at the fpga input pin with this technique I can work around that and make the whole receiver more configurable

AAbdullah how ?

Marvee Amasi•10/20/24, 9:16 PM

An arduino uno rr4 wifi to blynk platform , dynamically changing the wifi network name and password without altering the code is feasible , just that it requires the use of a wifi provisioning feature, somewhat like a blynk edgent library. Heard of Blynk.Edgent? Dat is designed for dynamic wifi management, it will wat wil make this work

MMarvee Amasi An arduino uno rr4 wifi to blynk platform , dynamically changing the wifi netw...

Abdullah•10/20/24, 9:28 PM

Yes I heard about it and used it on esp32 but it doesn't support arduino uno r4 wifi

AAbdullah Yes I heard about it and used it on esp32 but it doesn't support arduino uno r4 ...

Marvee Amasi•10/20/24, 9:32 PM

You sure about that ?

Abdullah•10/20/24, 9:35 PM

Yes I am sure, there is another library for embedded MCUs called blynk.ncp but I don't know how to use it if you know can you help me?

Marvee Amasi•10/20/24, 9:35 PM

Then you should use Arduino IoT Cloud

MMarvee Amasi Then you should use Arduino IoT Cloud

Abdullah•10/20/24, 10:42 PM

Is it possible to change the wifi network through the arduino iot cloud application?

Gigih•10/20/24, 11:00 PM

Hi, can anyone help me program a circuit? I'm a beginner and I have no idea how to do it

GGigih Hi, can anyone help me program a circuit? I'm a beginner and I have no idea how ...

techielew•10/21/24, 1:37 AM

What kind of circuit?

Ttechielew Are you back in Belgium?

kristof-at-embeetle•10/21/24, 3:02 AM

Nope. Still in Shenzhen.

AAbdullah Is it possible to change the wifi network through the arduino iot cloud applicat...

Marvee Amasi•10/21/24, 6:01 AM

It will allow u to manage device settings, u can add ur wifi credentials there too, and u wont have to be uploading new code each time you doin it. you can update the wifi network name SSID and password directly from the dashboard there

Mohan•10/21/24, 9:56 AM

How do I resolve this error ?

MMarvee Amasi It will allow u to manage device settings, u can add ur wifi credentials there ...

Abdullah•10/21/24, 11:48 AM

Do you mean that I can change it through the word network or is there another way?

Ttechielew What kind of circuit?

Gigih•10/21/24, 12:31 PM

Gigih•10/21/24, 12:31 PM

The circuit has a buzzer, an LED, 1 button (which is like a sensor), 1 button which is like a reset, an LCD screen, a switch and a Potentiometer. The project has to work as follows, as soon as I start simulating the project (which will be in Tinkercad) the word count and the zero below will appear on the LCD screen, as soon as I press the button that serves as a sensor, the counter it will show 1, ring the buzzer and turn on the LED at the same time and so on continuously, if for example I press the button 5 times, each time it is pressed it will appear on the LCD, depending on the time that the potentiometer marks and the buzzer and LED turn on together. The Potentiometer will serve as time in seconds to carry out the count, so for example if the Potentiometer has a delay of 4000 and I press the button, the counter will only show on the LCD after 4 seconds and the buzzer and the LED will also ring (the Potentiometer goes from 0 to 4000). When I press the switch down, it will show the Potentiometer information on the screen with the word Potentiometer at the top and the count in seconds below and when I move it up the switch will show the counter on the screen again. The other button will reset the counter

GGigih The circuit has a buzzer, an LED, 1 button (which is like a sensor), 1 button wh...

ZacckOsiemo•10/21/24, 12:41 PM

Nice plan, where are you currently having issues?

AAbdullah Do you mean that I can change it through the word network or is there another wa...

Marvee Amasi•10/21/24, 2:39 PM

Yh that network section is where u should enter ur wifi information

Marvee Amasi•10/21/24, 2:41 PM

Once you enter the SSID which is ur network name and then password, click that configure button to save the changes thrn try to connect to the new network

ZZacckOsiemo Nice plan, where are you currently having issues?

Gigih•10/21/24, 3:06 PM

I don't really know how to program what I want to do, I needed someone to help me program

GGigih I don't really know how to program what I want to do, I needed someone to help m...

ZacckOsiemo•10/21/24, 3:10 PM

Ah I see, I doubt you will find someone to help with that,
However if you are learning how to program and are stuck let us know we may be able to help.

ZZacckOsiemo Ah I see, I doubt you will find someone to help with that, However if you are le...

Gigih•10/21/24, 3:13 PM

Yes, I'm in the process, but I only know the basics, but I appreciate your attention

Abdullah•10/21/24, 3:15 PM

Thnx for help

Abdullah•10/21/24, 3:56 PM

I don't know how to flash arduino uno r4 wifi can someone help me?

Hello all, Any idea from where I can get better hands-on experience in RPi bare metal? Wanted to le

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