DevHeads IoT Integration Server•16mo ago

Hello @Ming, Do you know a way to make linux act as a USB Audio Device/peripheral for a USB Host? Fr

Hello @Ming,
Do you know a way to make linux act as a USB Audio Device/peripheral for a USB Host? From which we can access the IO Audio stream from Host using gstreamer/pyaudio?

Mmelta101 Hello @Ming, Do you know a way to make linux act as a USB Audio Device/periphera...

Ming•9/27/24, 5:07 PM

While I haven't played with it, there is a g_audiog_audio device driver, which is a Linux USB Audio gadget
I found some instructions for the Pi https://www.hackster.io/masonrf/rpi-zero-2-w-audio-gadget-448a6a

If you don't have a Pi, I could help you build the device driver

Hackster.io

RPi Zero 2 W Audio Gadget

The basics of turning a Raspberry Pi Zero 2 W into a USB OTG audio interface using the Linux gadget g_audio driver. By Mason Fleck.

Ming•9/27/24, 5:10 PM

Also - https://wiki.analog.com/resources/tools-software/linuxdsp/docs/linux-kernel-and-drivers/usb/device_mode/gdaget_audio

Abdullah•9/27/24, 5:12 PM

I have a project on Arduino Uno with ESP-01 that I connected to Blynk. When changing the password and the name of the Wi-Fi network, I need to change the code... I want this to be done via the web. What should I do?

MMing While I haven't played with it, there is a `g_audio` device driver, which is a L...

melta101OP•9/27/24, 5:13 PM

Oh,
This seems to be exactly what i wanted as a soln
I have rpi 4, WIll test this out and let you know,

melta101OP•9/27/24, 5:15 PM

I totally forgot about OTG,
all this time, i was thinking on how will i fool a Host to think that rpi is a peripheral

AAbdullah I have a project on Arduino Uno with ESP-01 that I connected to Blynk. When chan...

melta101OP•9/27/24, 5:21 PM

U could a webserver from which u can input your desired passwd, save that as a variable
Then reset the AP mode and then begin AP mode with new passwd variable

Mmelta101 U could a webserver from which u can input your desired passwd, save that as a v...

Abdullah•9/27/24, 5:25 PM

Please can you send a video or article explaining this?

AAbdullah Please can you send a video or article explaining this?

melta101OP•9/27/24, 5:26 PM

https://forum.arduino.cc/t/dynamic-configure-wifi-ssid-and-pwd/395466/4

Arduino Forum

Dynamic Configure wifi ssid and pwd

I am thinking more from a perspective if i want to produce such products in scale and volumes. I will not be able to sell it as-is. Each and every device has to have the n/w credentials hard coded. We will not be able to make it as a product, wherein you buy the programmed device and the user just plugs in and get started after setting their ow...

Mmelta101 https://forum.arduino.cc/t/dynamic-configure-wifi-ssid-and-pwd/395466/4

Abdullah•9/27/24, 5:26 PM

Thinks

Abdullah•9/27/24, 7:57 PM

I want to design an iot water quantity monitoring by esp32 that contains TDS, Turbidity, temperature, ph and water flow sensors. What parts and connections do you recommend and what additional parts do I need to build a complete system like this?

Abdullah•9/27/24, 7:58 PM

What is the best IOT platform to do this project on?

AAbdullah I want to design an iot water quantity monitoring by esp32 that contains TDS, Tu...

Umesh Lokhande•9/28/24, 7:46 AM

To keep things simple in the beginning I'd suggest use ESP32 to interface sensors and manage WiFi capabilities. There are enough analog and digital pins to handle h/w interfaces. For sensor selection, you may need to research online to ensure that they serve the purpose (compare power consumption, nature of analog output, cost, handling complexity to achieve accuracy/calibration). As fas as IoT platform goes stay with Blynk which offers a web dashboard and mobile apps with multi-user access. There are also plenty of videos on YT to help you get started. Best wishes!

nour_oud•9/28/24, 3:59 PM

Friendly Reminder about Upcoming Event
https://discord.gg/wAYBXw4K?event=1286326254844379207

Abdullah•9/28/24, 4:38 PM

I have a project connected to Arduino Uno with ESP-01 for Wi-Fi and it is controlled via the Blynk platform. I want to write the Wi-Fi network name and password externally via webserver and not inside the code. Is there a method, video, article, research or someone who can help me with this? I am in dire need of help.

javierpinzonc•9/28/24, 6:18 PM

Hi, greetings from Colombia

Jjavierpinzonc Hi, greetings from Colombia

Camila_99$$•9/28/24, 6:43 PM

Welcome Javier !

Jjavierpinzonc Hi, greetings from Colombia

techielew•9/29/24, 5:45 AM

What’s your story Javier? What brings you to DevHeads?

Nnour_oud 📅 Friendly Reminder about Upcoming Event https://discord.gg/wAYBXw4K?event=1286...

techielew•9/29/24, 5:47 AM

@Middleware & OS @MCU, MPU & Firmware, we hope to see you at tomorrows Engineering Hour on FreeRTOS with @Umesh Lokhande .

Join in the community meeting platform or Engineering Hour stage channel at 1500 UTC (Sunday, September 29)

bruce_wayne•9/29/24, 5:57 AM

Excited to join

bruce_wayne•9/29/24, 5:57 AM

Do we need a registration?

Bbruce_wayne Do we need a registration?

techielew•9/29/24, 5:59 AM

You can join in the Engineering Hour stage channel or sign up for an email reminder here: https://app.livestorm.co/devheads-community/devheads-weekly-office-hours-1/

DevHeads IoT Integration Server

Engineering Hour: Configure and use FreeRTOS API with Cortex-M MCU ...

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:...

AAbdullah I have a project connected to Arduino Uno with ESP-01 for Wi-Fi and it is contro...

Renuel Roberts•9/29/24, 10:58 AM

@kbrsi To allow you to configure the Wi-FiWi-Fi credentials for your ESP-01ESP-01 module externally through a web serverweb server, instead of hardcodinghardcoding them, you can use the WiFiManagerWiFiManager library. This will allow users to input the Wi-FiWi-Fi network name and password via a simple web interfaceweb interface. You can use this resources to guide you through the process:

https://github.com/tzapu/WiFiManager
https://randomnerdtutorials.com/wifimanager-with-esp8266-autoconnect-custom-parameter-and-manage-your-ssid-and-password/

GitHub

GitHub - tzapu/WiFiManager: ESP8266 WiFi Connection manager with we...

ESP8266 WiFi Connection manager with web captive portal - tzapu/WiFiManager

Random Nerd Tutorials

WiFiManager with ESP8266 - Autoconnect, Custom Parameter and Manage...

In this guide you'll learn how to use WiFiManager with the ESP8266 board. WiFiManager allows you to connect your ESP8266 to different Access Points (AP) without having to hard-code and upload new code to your board. Additionally, you can also add custom parameters (variables) and manage multiple SSID connections.

Nnour_oud 📅 Friendly Reminder about Upcoming Event https://discord.gg/wAYBXw4K?event=1286...

techielew•9/29/24, 2:21 PM

Reminder @Event Pings that we'll be starting this week's Engineering Hour on FreeRTOS for Cortex-M with @Umesh Lokhande in about 40 minutes. There are now a couple ways you can participate:

Joining in the event platform here: https://app.livestorm.co/devheads-community/devheads-weekly-office-hours-1/
Hanging out in the Engineering Hour Stage Channel

Either way you choose to join, we hope to see you there!

Abdullah•9/29/24, 5:36 PM

I have a project connected to the ESP32. The TDS sensor in it does not give correct values. It gives values of approximately 450 ppm for a liquid with a value of 940 ppm. What is the solution?

AAbdullah I have a project connected to the ESP32. The TDS sensor in it does not give corr...

melta101OP•9/29/24, 7:18 PM

Did you calibrate it?

Mmelta101 Did you calibrate it?

Abdullah•9/29/24, 7:24 PM

How do I calibrate it, knowing that I entered the temperature value by connecting the max6675 sensor and used the code on this site for the tds sensor meter?

https://randomnerdtutorials.com/esp32-tds-water-quality-sensor/

Random Nerd Tutorials

ESP32 with TDS Sensor (Water Quality Sensor) | Random Nerd Tutorials

How to use TDS meter (Total Dissolved Solids) with the ESP32. A TDS meter indicates the total dissolved solids like salts, minerals, and metals, in a solution.

Abdullah•9/29/24, 7:26 PM

I can't send the full code because I didn't open Discord features.

Xar•9/29/24, 8:17 PM

Hello, web dev here! I'm looking into learning about embedded programming and have decided that a simple RTOS from scratch would be my project. I have no interest in doing anything useful with the final product, the moment I get 80% - 95% of learning value I plan stopping and learning mech-eng. I have a RP 4 that would make for a good final boss but I don't know what to buy as a tutorial and any other equipment?

boualleg sabrina•9/29/24, 11:36 PM

@Xar like you need ideas ??

Bboualleg sabrina @Xar like you need ideas ??

Xar•9/29/24, 11:39 PM

Yeah like what microprocessor and other stuff to buy

boualleg sabrina•9/29/24, 11:39 PM

but you don't have the project idea

Xar•9/29/24, 11:59 PM

The idea was to build an RTOS from scratch

XXar The idea was to build an RTOS from scratch

melta101OP•9/30/24, 2:31 AM

If you really want to save money, you could try qemu

Mmelta101 If you really want to save money, you could try qemu

Xar•9/30/24, 2:34 AM

Good to know, I do have a budget of $100 or so.

melta101OP•9/30/24, 2:35 AM

Qemu is free

melta101OP•9/30/24, 2:38 AM

But if you want a feel of real world hardware,
100$ is a decent to buy variety good amount.
You could start with a any STM32 NUCLEO Board
Preferrebly the stm32f0 or f4
There are cheaper alternatives like esp32

XXar Hello, web dev here! I'm looking into learning about embedded programming and ha...

ZacckOsiemo•9/30/24, 3:18 AM

they just took 20 yrs to land rtos features in linux, if you plan on building an RTOS its best to focus on micro controllers

ZZacckOsiemo they just took 20 yrs to land rtos features in linux, if you plan on building an...

Xar•9/30/24, 3:21 AM

Microcontrollers is the plan!

XXar Microcontrollers is the plan!

ZacckOsiemo•9/30/24, 3:26 AM

also while ‘Making an RTOS’ might seem cooler you are better off ‘sending sensor data to a web dashboard’ which in itself is an iot project. Bonus points if you build everything from scratch (if its for learning purposes)

AAbdullah I have a project connected to Arduino Uno with ESP-01 for Wi-Fi and it is contro...

! Alarm !•9/30/24, 3:29 AM

check dm

Mmelta101 But if you want a feel of real world hardware, 100$ is a decent to buy variety g...

Xar•9/30/24, 3:41 AM

Should I also grab LEDs to simulate concurrency? Is there a nice kit someone could recommend?

XXar Should I also grab LEDs to simulate concurrency? Is there a nice kit someone cou...

melta101OP•9/30/24, 3:55 AM

You could show it in your serial port. LED are also good way
Get a led pack, resister pack, jumper wires and a breadboard

Marvin•9/30/24, 8:33 AM

Hey @everyone, There has been a lot of talk about this, I'm sure you have heard about it, and
wanted to get your take—especially from those of you knee-deep in real-world dev work.
We keep hearing about the shift toward "safer by design" languages like Rust,
particularly in safety-critical software. I can’t help but wonder how much of that
translates to the day-to-day realities of embedded development in our cases.
Take Google’s Android team, for instance—they’ve ditched unsafe languages for new
code, switching to Rust, and they claim a significant drop in memory vulnerabilities as a result.
I do think that is impressive.
But for those of us who’ve been in the trenches with C/C++ for years, is this push for
safety really as transformative as it seems?
Or are we trading old problems for new challenges?
Do you actively think about moving to safer languages? What are the barriers or benefits in your experience? Are you open to it,
or is the idea of leaving C/C++ behind still a bit too wild?

Looking forward to hearing your thoughts!

MMarvin Hey @everyone, There has been a lot of talk about this, I'm sure you have heard ...

ZacckOsiemo•9/30/24, 9:09 AM

Isn't the answer here it depends, And also when teams switch I wonder like for android the code that is switching is the AOSP code not the applications right? I feel like @Ming and @ke7c2mi would have gone through enough to have an opinion on this. I on the other hand think its trading between dieties

MMarvin Hey @everyone, There has been a lot of talk about this, I'm sure you have heard ...

techielew•9/30/24, 9:19 AM

I don't think it's an either/or proposition. There's way too much installed C/C++ for it to 'go away'. In places where it makes sense, and you can realize efficiencies, people will use and learn Rust. But there are going to be multi-language devs and systems.

MMarvin Hey @everyone, There has been a lot of talk about this, I'm sure you have heard ...

techielew•9/30/24, 9:22 AM

@barafael could probably lend you some perspective on what real life is like a Rust dev.

Ttechielew I don't think it's an either/or proposition. There's way too much installed C/C+...

Marvin•9/30/24, 9:32 AM

I think there is a lot of work that still needs to go into making sure those multi-language systems can be built in a way that ensures no rewrites in the future. I say this because last I checked interop isn't at a great place, yet. Especially the interop between Rust and C++, with both having concepts that the other doesn't understand and is hard reconciling like Rust does not understand function overloading and C++ not having traits.
I agree with you though I think it will take some time. And this point, it becomes a matter of urgency but eventually the industry is taking that path.

MMarvin I think there is a lot of work that still needs to go into making sure those mul...

ZacckOsiemo•9/30/24, 9:35 AM

You could also interOp by API rather than by FFI then you can have your walled gardens

MMarvin Hey @everyone, There has been a lot of talk about this, I'm sure you have heard ...

barafael•9/30/24, 9:42 AM

Disclaimer I'm a zealot and spent the last 4 years of my career coding (bare metal and distributed systems, also lots of "multi language interop"), mentoring, and teaching rust. And yes, I think it's about trading old problems for new challenges. The old problem is e.g. a hardfault if you are lucky, the new challenge is a compile error. For me this alone was transformative. Package/dependency mgmt, docs, and how rust does zero cost functional patterns did the rest. Also being able to define asynchronous io on mcus and have it translated to a perfect interrupt-driven state machine.
Rust is hard to learn for most, and it stays hard in some ways. And it's immature in some areas compared to others. But it's been so much fun.

Bbarafael Disclaimer I'm a zealot and spent the last 4 years of my career coding (bare met...

ZacckOsiemo•9/30/24, 9:45 AM

How does async io get translated to ISR state machines could you shed some light on that please?

Hello @Ming, Do you know a way to make linux act as a USB Audio Device/peripheral for a USB Host? Fr

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