Qball
@qballcow.bsky.social
#lowpower, #tech, #esp32, #fpga, #rofi, #embedded
I got an Bluetti elite 30 v2 as new UPS. The reasoning was, its about the same price, has UPS functionality and compared to same price UPS has around 10 times the battery life time.
Ideally the lifepo4 should have a longer life then the lead-acid in the APC.
www.bluettipower.eu/products/eli...
Ideally the lifepo4 should have a longer life then the lead-acid in the APC.
www.bluettipower.eu/products/eli...
BLUETTI Elite 30 V2 Portable Power Station | 600W 288Wh
BLUETTI Elite 30 V2 – 600W 288Wh portable power station with ≤10ms UPS, 140W PD fast charging & LiFePO4 battery. Perfect for camping, home backup & off-grid use. Shop now.
www.bluettipower.eu
November 7, 2025 at 4:54 PM
I got an Bluetti elite 30 v2 as new UPS. The reasoning was, its about the same price, has UPS functionality and compared to same price UPS has around 10 times the battery life time.
Ideally the lifepo4 should have a longer life then the lead-acid in the APC.
www.bluettipower.eu/products/eli...
Ideally the lifepo4 should have a longer life then the lead-acid in the APC.
www.bluettipower.eu/products/eli...
3D print this morning tore a layer of my glass print bed...
RIP sidewinder. It was old-ish, but had a nice huge print bed and happily printed stuff like ASA.
RIP sidewinder. It was old-ish, but had a nice huge print bed and happily printed stuff like ASA.
November 6, 2025 at 6:11 PM
3D print this morning tore a layer of my glass print bed...
RIP sidewinder. It was old-ish, but had a nice huge print bed and happily printed stuff like ASA.
RIP sidewinder. It was old-ish, but had a nice huge print bed and happily printed stuff like ASA.
Can somebody tell me what the actual timings are for a WS2812b chip? I've made an FPGA module to drive them, following the timings from the datasheet. Doesn't work.
Increased Treset to 100uS, now some work. But others don't.
Found out some need 280uS, increased it. still some clones don't work.
Increased Treset to 100uS, now some work. But others don't.
Found out some need 280uS, increased it. still some clones don't work.
November 4, 2025 at 6:50 PM
Can somebody tell me what the actual timings are for a WS2812b chip? I've made an FPGA module to drive them, following the timings from the datasheet. Doesn't work.
Increased Treset to 100uS, now some work. But others don't.
Found out some need 280uS, increased it. still some clones don't work.
Increased Treset to 100uS, now some work. But others don't.
Found out some need 280uS, increased it. still some clones don't work.
You know you are tired, when you order 10 fuses (and even double checking this), while you need 16...
Now to get to my minimum ordering amount again @ mouser.
Now to get to my minimum ordering amount again @ mouser.
November 4, 2025 at 5:14 PM
You know you are tired, when you order 10 fuses (and even double checking this), while you need 16...
Now to get to my minimum ordering amount again @ mouser.
Now to get to my minimum ordering amount again @ mouser.
real lug, vs amazon lug.. Spot the difference.
October 30, 2025 at 6:35 PM
real lug, vs amazon lug.. Spot the difference.
ugh.. package arrived from china.. its in the dhl machine close by.. but because they did not use my e-mail, I have no way to pick it up...
October 30, 2025 at 5:44 PM
ugh.. package arrived from china.. its in the dhl machine close by.. but because they did not use my e-mail, I have no way to pick it up...
Ugh. bought ring cable lug on amazon, because I needed it very quick... stupid move.. Why do I keep doing this?
Its so thin and bad, it should never be used/sold.
It will do for a day or two, but I need to replace this asap. So now ordering from an actual shop, instead of a glorified trashheap.
Its so thin and bad, it should never be used/sold.
It will do for a day or two, but I need to replace this asap. So now ordering from an actual shop, instead of a glorified trashheap.
October 28, 2025 at 8:12 PM
Ugh. bought ring cable lug on amazon, because I needed it very quick... stupid move.. Why do I keep doing this?
Its so thin and bad, it should never be used/sold.
It will do for a day or two, but I need to replace this asap. So now ordering from an actual shop, instead of a glorified trashheap.
Its so thin and bad, it should never be used/sold.
It will do for a day or two, but I need to replace this asap. So now ordering from an actual shop, instead of a glorified trashheap.
For now lets make a control panel for it for some measuring equipment/power supplies I have.
Now to hook everything up, mqtt is the easiest, but I will need SCPI for other stuff, so maybe investigate that.
Now to hook everything up, mqtt is the easiest, but I will need SCPI for other stuff, so maybe investigate that.
October 26, 2025 at 12:20 PM
For now lets make a control panel for it for some measuring equipment/power supplies I have.
Now to hook everything up, mqtt is the easiest, but I will need SCPI for other stuff, so maybe investigate that.
Now to hook everything up, mqtt is the easiest, but I will need SCPI for other stuff, so maybe investigate that.
Another (small) aliexpress haul, a 4" 480x480 esp32s3 display module (with touchscreen). It looks good, but importantly it is not spi, but paral. interface with vsync. So I should be able to make the interface tear-free. No use for it yet, but it looks a perfect panelmount.
below the widget demo:
below the widget demo:
October 25, 2025 at 7:17 PM
Another (small) aliexpress haul, a 4" 480x480 esp32s3 display module (with touchscreen). It looks good, but importantly it is not spi, but paral. interface with vsync. So I should be able to make the interface tear-free. No use for it yet, but it looks a perfect panelmount.
below the widget demo:
below the widget demo:
Below is the discharge curve of one of the li-sodium cells. While easy to determine the capacity left, it is terrible for powering stuff.. the 4s pack starts at 16V, then you go down to 8V. I saw you can now buy a power station with these batteries, wonder how they set it up.
October 21, 2025 at 7:57 PM
Below is the discharge curve of one of the li-sodium cells. While easy to determine the capacity left, it is terrible for powering stuff.. the 4s pack starts at 16V, then you go down to 8V. I saw you can now buy a power station with these batteries, wonder how they set it up.
Been playing with li-sodium batteries a while back. Currently have a 20Ah (2p4s) pack in use, decided to make it 4p4s.
Made a PCB to link up the 4p where each is fused incl. status led to show if there is an issue. Use a jk-bms, it allows me to set the parameters close enough for this chemistry.
Made a PCB to link up the 4p where each is fused incl. status led to show if there is an issue. Use a jk-bms, it allows me to set the parameters close enough for this chemistry.
October 19, 2025 at 8:12 PM
Been playing with li-sodium batteries a while back. Currently have a 20Ah (2p4s) pack in use, decided to make it 4p4s.
Made a PCB to link up the 4p where each is fused incl. status led to show if there is an issue. Use a jk-bms, it allows me to set the parameters close enough for this chemistry.
Made a PCB to link up the 4p where each is fused incl. status led to show if there is an issue. Use a jk-bms, it allows me to set the parameters close enough for this chemistry.
I've created +-50A isolated current sensor before using hal sensor, this works great. However they tend to have an offset and drift. So when measuring 1mA up to +-30A, this is not great. Shunt meas is better, but not isolated. I saw this one: docs.m5stack.com/en/unit/Unit.... Great idea.
m5-docs
The reference docs for M5Stack products. Quick start, get the detailed information or instructions such as IDE,UIFLOW,Arduino. The tutorials for M5Burner, Firmware, Burning, programming. ESP32,M5Stick...
docs.m5stack.com
October 11, 2025 at 12:32 PM
I've created +-50A isolated current sensor before using hal sensor, this works great. However they tend to have an offset and drift. So when measuring 1mA up to +-30A, this is not great. Shunt meas is better, but not isolated. I saw this one: docs.m5stack.com/en/unit/Unit.... Great idea.
Showed unCAL out of nothing. Going into the menu running rom/ram test passed and it seems happy again, but not a good sign.
October 5, 2025 at 8:26 PM
Showed unCAL out of nothing. Going into the menu running rom/ram test passed and it seems happy again, but not a good sign.
Always fun when you find out that 3 years ago you where an idiot, did not read the datasheet and then for the next 3 year continue to copy/paste the error. At least I (in a now unneeded step) calibrated my error away.
a bald man in a red sweater is covering his face with his hand .
ALT: a bald man in a red sweater is covering his face with his hand .
media.tenor.com
October 5, 2025 at 7:48 PM
Always fun when you find out that 3 years ago you where an idiot, did not read the datasheet and then for the next 3 year continue to copy/paste the error. At least I (in a now unneeded step) calibrated my error away.
It's frustrating getting issue reports: 'X does not work'. Checking out what they are doing, its a complete chaos. Using config options that never existed or been gone for 5+ years.
They waste much of their own time and mine. Instead of using AI, reading the docu would have solved it in minutes.
They waste much of their own time and mine. Instead of using AI, reading the docu would have solved it in minutes.
October 2, 2025 at 10:12 PM
It's frustrating getting issue reports: 'X does not work'. Checking out what they are doing, its a complete chaos. Using config options that never existed or been gone for 5+ years.
They waste much of their own time and mine. Instead of using AI, reading the docu would have solved it in minutes.
They waste much of their own time and mine. Instead of using AI, reading the docu would have solved it in minutes.
Can we start a petition to get the floppy drive header back on motherboards... I need one..
September 29, 2025 at 7:53 PM
Can we start a petition to get the floppy drive header back on motherboards... I need one..
For the past 8 years, I used 1L pcs or laptops for my work. A year or so ago I bought a AMD 8700G pc so I could do some small games. However, while this worked amazingly well. Especially after overclocking the memory and cpu a bit. However I did get a cheap 2nd hand rx6600, older gen, less memory.
September 27, 2025 at 6:30 PM
For the past 8 years, I used 1L pcs or laptops for my work. A year or so ago I bought a AMD 8700G pc so I could do some small games. However, while this worked amazingly well. Especially after overclocking the memory and cpu a bit. However I did get a cheap 2nd hand rx6600, older gen, less memory.
Sometimes keeping your random projects around pays off. Re-building my outdoor air particle measurement node, I Wanted to know the average power usage. The meter I build around an ina228 digital power monitor is perfect for the job.
A pmsa003 sensor and a esp32c3 battery powered.
A pmsa003 sensor and a esp32c3 battery powered.
September 27, 2025 at 5:33 PM
Sometimes keeping your random projects around pays off. Re-building my outdoor air particle measurement node, I Wanted to know the average power usage. The meter I build around an ina228 digital power monitor is perfect for the job.
A pmsa003 sensor and a esp32c3 battery powered.
A pmsa003 sensor and a esp32c3 battery powered.
@ruenahcmohr.bsky.social For my rgb led these are the curves.. Green went to past -90V, blue ~-85V, red: -33V.
I also stress tested the blue LED, it failed after a while as a short.
I also stress tested the blue LED, it failed after a while as a short.
September 22, 2025 at 4:51 PM
@ruenahcmohr.bsky.social For my rgb led these are the curves.. Green went to past -90V, blue ~-85V, red: -33V.
I also stress tested the blue LED, it failed after a while as a short.
I also stress tested the blue LED, it failed after a while as a short.
Was trying to get the Arducam B0400 to work with an fpga.. Everything worked on one desk, but not the next desk over. Some nice round freq. worked better then others.. Weirdness all around. Turned out that doing the CS in hardware was apparently to fast. Moving this to software everything works.
September 21, 2025 at 3:02 PM
Was trying to get the Arducam B0400 to work with an fpga.. Everything worked on one desk, but not the next desk over. Some nice round freq. worked better then others.. Weirdness all around. Turned out that doing the CS in hardware was apparently to fast. Moving this to software everything works.
Got an old decade box from 1957 (last checked in 1981).
It is from 0.1 Ohm to 1kOhm. Regrettable 6.0 Ohm is 6.4, all others are spot on. (this unit been used by students, so amazing it works).
Contacts needs some cleaning. Anybody knows what type of grease is best to stop the contacts oxidizing?
It is from 0.1 Ohm to 1kOhm. Regrettable 6.0 Ohm is 6.4, all others are spot on. (this unit been used by students, so amazing it works).
Contacts needs some cleaning. Anybody knows what type of grease is best to stop the contacts oxidizing?
September 19, 2025 at 8:47 PM
Got an old decade box from 1957 (last checked in 1981).
It is from 0.1 Ohm to 1kOhm. Regrettable 6.0 Ohm is 6.4, all others are spot on. (this unit been used by students, so amazing it works).
Contacts needs some cleaning. Anybody knows what type of grease is best to stop the contacts oxidizing?
It is from 0.1 Ohm to 1kOhm. Regrettable 6.0 Ohm is 6.4, all others are spot on. (this unit been used by students, so amazing it works).
Contacts needs some cleaning. Anybody knows what type of grease is best to stop the contacts oxidizing?
Created one of my simplest PCB, of something I used many times before without issue... First PCB to not work at all, this even followed the recommended layout. Its frustrating that the one of simplest PCB, is also the first that completely failed.
New tweaked version orderd, hopefully this works.
New tweaked version orderd, hopefully this works.
September 15, 2025 at 5:14 PM
Created one of my simplest PCB, of something I used many times before without issue... First PCB to not work at all, this even followed the recommended layout. Its frustrating that the one of simplest PCB, is also the first that completely failed.
New tweaked version orderd, hopefully this works.
New tweaked version orderd, hopefully this works.
Tried todo a quick trace on an red led I had lying around.
First is the V/I curve linear, 2nd is the log plot. Pretty neat.
First is the V/I curve linear, 2nd is the log plot. Pretty neat.
September 12, 2025 at 7:35 PM
Tried todo a quick trace on an red led I had lying around.
First is the V/I curve linear, 2nd is the log plot. Pretty neat.
First is the V/I curve linear, 2nd is the log plot. Pretty neat.
Got the converter in, so I could test the SMU in the hp 4155A.
It seems pretty spot on.
Testing the current measurement is harder. But I could measure the 10Mohm input resistance of the DMM down to 100 nA. Below that the value went slightly off (but my setup is totally unsuitable for that.).
It seems pretty spot on.
Testing the current measurement is harder. But I could measure the 10Mohm input resistance of the DMM down to 100 nA. Below that the value went slightly off (but my setup is totally unsuitable for that.).
September 12, 2025 at 4:39 PM
Got the converter in, so I could test the SMU in the hp 4155A.
It seems pretty spot on.
Testing the current measurement is harder. But I could measure the 10Mohm input resistance of the DMM down to 100 nA. Below that the value went slightly off (but my setup is totally unsuitable for that.).
It seems pretty spot on.
Testing the current measurement is harder. But I could measure the 10Mohm input resistance of the DMM down to 100 nA. Below that the value went slightly off (but my setup is totally unsuitable for that.).