If not in front of my computer, I am procrastinating. Want a good job in Embedded before 11 July 2027.
Remote
Joined May 2026
- Tweets5.6K
- Following439
- Followers627
- Likes5.7K
This may sound stupid to you but there is a high chance that she was someone who was involved with tabla in her past life.
She worked a lot on it in her previous life which is why all of this is so easy for her.
I assumed that weekend would be a good day to call. But he's not responding to me since Friday.
We were supposed to have a chat on 22nd but I couldn't because of Pooja and Visarjan.
So guys should I call him from my side at 4 30-5:00 PM today?
So here is the 2nd part of the project:
The sensor data needs to be displayed on a big RGB LED display board made up of 24 P10 modules each of resolution 32x16 SMD neopixels.
These 24 modules will be arranged into a display board in either 8x3 or 6x4 layout, where the boards are connected to each other with HUB75E interface cables.
We are going to use HD-A3L LED controller cum multimedia player, which has Wi-Fi, LAN, USB etc inbuilt into it. This will be used to take in the input from the server (the data which the sensors capture and send to the server, as described in the previous post) through any of these options, depending on the location of display and it's proximity to the server.
The data will then go into HD-R712 receiving card which will be connected to HD-A3L via an Ethernet cable. These receiving cards are responsible for connecting multiple display modules together to make them actually as a single display. It has 12 HUB75E interfaces for that.
The P10 modules will be connected to HD-R712 and will make the display board.
The modules will be connected in a chain by HUB75E cables and then to the receiving card by the same cables again.
The receiving card and the P10 modules run on separate 5V DC supplies and the HD-A3L controller can run on 5 to 12 V DC.
On this side there is very little manual coding required to display the data.
Huidu Technologies, the manufacturer of HD-A3L and HD-R712 has their own tools for setting up the displays. It has its own software called HDPlayer and HDSet.
Once we connect the display modules with each other to form the panel, we can configure it's parameters and settings easily using the HDPlayer software.
These settings include resolution, brightness, module mapping and receiving card settings.
Then comes fetching data recorded by the esp32 from the Server and displaying it on the display board. And there are several ways of doing this. But again Huidu Technologies provides a software called XiaoHui Cloud.
Traditionally we can connect our HD-A3L to the server using Wifi or an network cable. But there is a high chance that these two could be located far from each other.
So we have to shift on long range wireless connection which includes:
a. The inbuilt 4G module inside HD-A3L,
b. The cloud infrastructure provided by the manufacturer which they call XiaoHui Cloud.
Not all HD-A3L have a SIM card slot and 4g modem, so at this moment XiaoHui Cloud looks like the better option here.
So to communicate the data between the server and the XiaoHui Cloud, we have to write a Python/Go script which would use the manufacturer's API to publish the recorded data to HDPlayer, which would then display it on the board using HD-R712.
Alternatively, we can write code (which runs on the server) to generate a text string from the recorded data and send it to the HD-A3L via Huidu's protocols. I have found some existing open source libraries for that.
By sending the sensor readings as soon as they are generated, once per minute, we can display (almost) real time AQI data on the display board.
The layout of data on the board will depend on it's layout, user experience and government rules (if any such rules exists).
The display modules are RGB and I will use these colours to show the severity of the index:
Green - Good
Yellow- Moderate
Orange- Unhealthy for Sensitive people
Red - unhealthy
Purple - Very unhealthy
Maroon - Hazardous
So here is the 2nd part of the project:
The sensor data needs to be displayed on a big RGB LED display board made up of 24 P10 modules each of resolution 32x16 SMD neopixels.
These 24 modules will be arranged into a display board in either 8x3 or 6x4 layout, where the boards are connected to each other with HUB75E interface cables.
We are going to use HD-A3L LED controller cum multimedia player, which has Wi-Fi, LAN, USB etc inbuilt into it. This will be used to take in the input from the server (the data which the sensors capture and send to the server, as described in the previous post) through any of these options, depending on the location of display and it's proximity to the server.
The data will then go into HD-R712 receiving card which will be connected to HD-A3L via an Ethernet cable. These receiving cards are responsible for connecting multiple display modules together to make them actually as a single display. It has 12 HUB75E interfaces for that.
The P10 modules will be connected to HD-R712 and will make the display board.
The modules will be connected in a chain by HUB75E cables and then to the receiving card by the same cables again.
The receiving card and the P10 modules run on separate 5V DC supplies and the HD-A3L controller can run on 5 to 12 V DC.
On this side there is very little manual coding required to display the data.
Huidu Technologies, the manufacturer of HD-A3L and HD-R712 has their own tools for setting up the displays. It has its own software called HDPlayer and HDSet.
Once we connect the display modules with each other to form the panel, we can configure it's parameters and settings easily using the HDPlayer software.
These settings include resolution, brightness, module mapping and receiving card settings.
Then comes fetching data recorded by the esp32 from the Server and displaying it on the display board. And there are several ways of doing this. But again Huidu Technologies provides a software called XiaoHui Cloud.
Traditionally we can connect our HD-A3L to the server using Wifi or an network cable. But there is a high chance that these two could be located far from each other.
So we have to shift on long range wireless connection which includes:
a. The inbuilt 4G module inside HD-A3L,
b. The cloud infrastructure provided by the manufacturer which they call XiaoHui Cloud.
Not all HD-A3L have a SIM card slot and 4g modem, so at this moment XiaoHui Cloud looks like the better option here.
So to communicate the data between the server and the XiaoHui Cloud, we have to write a Python/Go script which would use the manufacturer's API to publish the recorded data to HDPlayer, which would then display it on the board using HD-R712.
Alternatively, we can write code (which runs on the server) to generate a text string from the recorded data and send it to the HD-A3L via Huidu's protocols. I have found some existing open source libraries for that.
By sending the sensor readings as soon as they are generated, once per minute, we can display (almost) real time AQI data on the display board.
The layout of data on the board will depend on it's layout, user experience and government rules (if any such rules exists).
The display modules are RGB and I will use these colours to show the severity of the index:
Green - Good
Yellow- Moderate
Orange- Unhealthy for Sensitive people
Red - unhealthy
Purple - Very unhealthy
Maroon - Hazardous
This is the most sophisticated thing I ever made in my entire life. And this post is going to be a reflection of what I am feeling through for the past 48 hours.
Everything I wrote about in my previous post is just a single part of the system I am expected to develop on my own for my client (if the deal works out)
Aww man, I am really happy while learning neat stuff like LittleFS, MQTT, and combining multiple P10 2727 led modules into a single display board, designing things on paper, looking at all relevant tutorials available for them on YouTube and other forums.
I will be writing more about them in future posts.
Unfortunately this opportunity came during dussehra and I was unable to do a lot of things due to puja. (We have a lot of rituals, you know typical Brahmin pooja stuff, also I was at my village without my laptop).
But I am in my zone now, and in the last 48 hrs, I have learnt a lot of new things.
Thanks @VazeKshitij ♥️
'I was always fascinated by your logger thing buddy, I never had a good thing to log. Now that this job requires me to log a lot of data locally and also on a server, I am going to binge read all of your long posts on that logger you made for rhygen. Hopefully I can do justice to this.'
Abhi I have cleared about 70% of the stuff. Everything is in my brain of course but if everything goes on smoothly that 70% of work can be done very quickly.
I also want to thank @RFOXiA1 for suggesting me to use batch write which would reduce wearing down of flash memory.
There are a lot of unknowns here, like it's going to be the first time I would write firmware without having the actual parts. Don't know if it is going to be disastrous because thanks to the geography, there is no fucking way that my sensors and boards would arrive in time, and I don't have other things required to replicate the system that I have to build.
I guess that is why hardware is considered hard. It's not that simple as developing webpages. You need to have the hardware here so you can see if your firmware does the job.
I hope this one task will be forgiving.
So you are going to see a lot of long posts explaining what I am learning, what I am building and my experiences.
Hopefully everything goes fine and I get the job. Because for some personal reasons I am running late. But I promise I am going to catch up.
Last of all, I wanna mention @atharvasp8 who put in the idea of making something that uses the microcontroller in most unique and clever way, I hope I can do justice to this idea as well.
Follow for more.
This is the most sophisticated thing I ever made in my entire life. And this post is going to be a reflection of what I am feeling through for the past 48 hours.
Everything I wrote about in my previous post is just a single part of the system I am expected to develop on my own for my client (if the deal works out)
Aww man, I am really happy while learning neat stuff like LittleFS, MQTT, and combining multiple P10 2727 led modules into a single display board, designing things on paper, looking at all relevant tutorials available for them on YouTube and other forums.
I will be writing more about them in future posts.
Unfortunately this opportunity came during dussehra and I was unable to do a lot of things due to puja. (We have a lot of rituals, you know typical Brahmin pooja stuff, also I was at my village without my laptop).
But I am in my zone now, and in the last 48 hrs, I have learnt a lot of new things.
Thanks @VazeKshitij ♥️
'I was always fascinated by your logger thing buddy, I never had a good thing to log. Now that this job requires me to log a lot of data locally and also on a server, I am going to binge read all of your long posts on that logger you made for rhygen. Hopefully I can do justice to this.'
Abhi I have cleared about 70% of the stuff. Everything is in my brain of course but if everything goes on smoothly that 70% of work can be done very quickly.
I also want to thank @RFOXiA1 for suggesting me to use batch write which would reduce wearing down of flash memory.
There are a lot of unknowns here, like it's going to be the first time I would write firmware without having the actual parts. Don't know if it is going to be disastrous because thanks to the geography, there is no fucking way that my sensors and boards would arrive in time, and I don't have other things required to replicate the system that I have to build.
I guess that is why hardware is considered hard. It's not that simple as developing webpages. You need to have the hardware here so you can see if your firmware does the job.
I hope this one task will be forgiving.
So you are going to see a lot of long posts explaining what I am learning, what I am building and my experiences.
Hopefully everything goes fine and I get the job. Because for some personal reasons I am running late. But I promise I am going to catch up.
Last of all, I wanna mention @atharvasp8 who put in the idea of making something that uses the microcontroller in most unique and clever way, I hope I can do justice to this idea as well.
Follow for more.
The festivals have ended. Will work for some time on this project.
It's related to AQI monitoring and logging. (I have some experience with that using the cheap DHT20 sensors). But this time it is a better one called SHT20. This sensor will record temperature, humidity etc.
Then there is Particulate Matter Sensor Plantower PMS500 which will measure the dust and pollutants using some laser scattering stuff to measure different size particulate matters.
I have to connect these two to an ESP32. And write firmware for reading values from the sensor and packing it into a telemetry packet and send it to a server. Frequency is once per minute.
SHT20 is an I2C sensor and PMS5003 will need an UART port. This is very convenient as I don't have to deal with sensors sharing same data lines.
ESP32 should also store that data locally for a time of 10 hours, so that in case of some faults we don't loose any data. I am thinking of storing that data inside the memory of ESP32 itself reducing the need of a separate SD card and SD card reader. SD cards have their own flaws as well. For starters, they may get corrupted because of frequent reads and writes.
My firmware should also allow for easy calibration of the sensors when needed. Honestly, this is the only intimidating thing, at least on the sensor side of things.
I have found some resources and have gone through them. Everything works in theory.
Will talk more about it once I understand the server side requirements.
To summarise:
1. Connect SHT20 with I2C and PMS5003 to UART on ESP32.
2. ESP32 should connect to the wireless network (through a router)
3. ESP32 should read their values once every minute, package it, log it locally, and send it to server.
4. It should have calibration functions too.
If you got 43 minutes, watch this.
It's the best thing I watched today.
Link: youtu.be/YgoiujmwLKI?si=iE2w…
The festivals have ended. Will work for some time on this project.
It's related to AQI monitoring and logging. (I have some experience with that using the cheap DHT20 sensors). But this time it is a better one called SHT20. This sensor will record temperature, humidity etc.
Then there is Particulate Matter Sensor Plantower PMS500 which will measure the dust and pollutants using some laser scattering stuff to measure different size particulate matters.
I have to connect these two to an ESP32. And write firmware for reading values from the sensor and packing it into a telemetry packet and send it to a server. Frequency is once per minute.
SHT20 is an I2C sensor and PMS5003 will need an UART port. This is very convenient as I don't have to deal with sensors sharing same data lines.
ESP32 should also store that data locally for a time of 10 hours, so that in case of some faults we don't loose any data. I am thinking of storing that data inside the memory of ESP32 itself reducing the need of a separate SD card and SD card reader. SD cards have their own flaws as well. For starters, they may get corrupted because of frequent reads and writes.
My firmware should also allow for easy calibration of the sensors when needed. Honestly, this is the only intimidating thing, at least on the sensor side of things.
I have found some resources and have gone through them. Everything works in theory.
Will talk more about it once I understand the server side requirements.
To summarise:
1. Connect SHT20 with I2C and PMS5003 to UART on ESP32.
2. ESP32 should connect to the wireless network (through a router)
3. ESP32 should read their values once every minute, package it, log it locally, and send it to server.
4. It should have calibration functions too.
Rahul Gandhi it's done bro.
#WATCH | Dumka, Jharkhand | BJP MP Nishikant Dubey says, "My direct allegation is that every time Rahul Gandhi travels abroad, he engages with the syndicates of Neville Roy Singham, Ilhan Omar, Ro Khanna, and the Soros Foundation. Based on these US Congress reports, it appears he has been "bought off" by the cryptocurrency, artificial intelligence, and online gambling lobbies. At their behest—and fueled by their incitement—he and various opposition parties mobilise the youth to push for regime change. They seek to fragment India once again—much like the partition carried out by Nehru. They aim to divide the nation and replicate the dire conditions seen in Nepal, Sri Lanka, or Pakistan—a goal that will not succeed, as the world has now awakened. These reports reveal that he maintains personal ties with these traitors.
The government will take appropriate action, but we will also go directly to the people. In politics and democracy, the public is paramount. We will ensure that the Congress party is reduced to a state of total irrelevance. When these documents are presented to the public, no leader from the Congress, the opposition, or those supporting the Congress will have the standing to show their faces to the people—and the public might well call them out for their disgrace."
I feel like leaving eating nonveg for ever.
No religious reasons at all.
I feel like veg people look more attractive.
My family after learning about attack on Tiger Shroff:
'wo to itna bada actor bhi nahi, uspe attack kyon kiya?'
😂
Let's see how many flaws can you find in this 'technlogy'?
This headset lets you walk through a room with your eyes closed and never hit a thing.
A raw circuit board strapped across a guy's face. Sensors, a speaker, a nest of wires held on by tape.
It reads what's in front of you. The closer an obstacle gets, the louder it beeps. A wall, a door, a person stepping into your path, all of it turned into sound.
This is built for blind and low-vision people. No cane, no guide dog, just a quiet beep that says stop before you hit it.
A teenager built real freedom into a pair of glasses.
And he did it on a desk.
Gawar ye starlink nai tesla h 😭
Narendra Modi, you still have time. Swallow your ego, apologise to Elon Musk, and let Starlink operate in India.
Imagine having the world’s richest tech visionary ready to bring satellite internet to your country, yet letting bureaucratic nonsense and Indian Prime Minister Mukesh Ambani get in the way.
Stop making India pay the price for your political friendships. 🇮🇳
