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Low voltage solution
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I'm tired of it!?
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C cables, I ordered some SHORT one and USB C to micro adapters for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The wires in normal USB cables are way too small for several amps.
?
No problems here with supplies provided with my Pi4's.
?
Ideas?
--
73, Bo W4GHV since '54
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my experience is that most wall warts provide 4.99 volts and the rpis want 5.1
toggle quoted message
Show quoted text
On November 6, 2024 5:22:28 PM GMT+01:00, Bo W4GHV <bobarr@...> wrote:
I'm tired of it!?
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C cables, I ordered some SHORT one and USB C to micro adapters for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The wires in normal USB cables are way too small for several amps.
?
No problems here with supplies provided with my Pi4's.
?
Ideas?
--
73, Bo W4GHV since '54
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I ended up buying a bunch of buck converters that will take 10-24V in
and give a constant adjustable output. I have a couple devices (like
weather radio) that run from 9V wall warts as well as some RaspberryPis
that need a little over 5V and run everything off of a big 12V power
supply. I set the RPi converters for about 5.3V and never see the little
low voltage warnings.
It has always amazed me with the popularity among hams of the
RaspberryPi that more 12V power solutions are not out there. I loved the
MoPi2 hat, very versatile. But, unfortunately, it was discontinued. I
wish I had bought several of them at the time. It is sad that there is
nothing comparable on the market, especially with the higher power
demands of the newer Pi versions.
Michael WA7SKG
Bo W4GHV wrote on 11/6/24 8:22 AM:
toggle quoted message
Show quoted text
I'm tired of it!
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C cables, I
ordered some SHORT one and USB C to micro adapters for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The wires in
normal USB cables are way too small for several amps.
No problems here with supplies provided with my Pi4's.
Ideas?
--
73, Bo W4GHV since '54
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Sent while portable! please excuse typos.
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Show quoted text
On 6 Nov 2024, at 18:44, Michael WA7SKG via groups.io <wa7skg@...> wrote:
?
I ended up buying a bunch of buck converters that will take 10-24V inand give a constant adjustable output. I have a couple devices (likeweather radio) that run from 9V wall warts as well as some RaspberryPisthat need a little over 5V and run everything off of a big 12V powersupply. I set the RPi converters for about 5.3V and never see the littlelow voltage warnings.It has always amazed me with the popularity among hams of theRaspberryPi that more 12V power solutions are not out there. I loved theMoPi2 hat, very versatile. But, unfortunately, it was discontinued. Iwish I had bought several of them at the time. It is sad that there isnothing comparable on the market, especially with the higher powerdemands of the newer Pi versions.Michael WA7SKGBo W4GHV wrote on 11/6/24 8:22 AM:I'm tired of it!
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C cables, I
ordered some SHORT one and USB C to micro adapters for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The wires in
normal USB cables are way too small for several amps.
No problems here with supplies provided with my Pi4's.
Ideas?
--
73, Bo W4GHV since '54
IIRC the RPi4 states 5.2v. but what is 0.1v between fiends.
I use old recycled 'Traco Power' 5v 5A smpsus and supply power
direct to the Pin Headers using two power and two sense cables. I
had a good free source of the Traco, long gone, sadly.
On 06/11/2024 18:25, Bjorn Pehrson via
groups.io wrote:
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my experience is that most wall warts provide 4.99
volts and the rpis want 5.1
On November 6, 2024 5:22:28 PM GMT+01:00, Bo
W4GHV <bobarr@...> wrote:
I'm tired of it!?
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C
cables, I ordered some SHORT one and USB C to micro adapters
for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The
wires in normal USB cables are way too small for several
amps.
?
No problems here with supplies provided with my Pi4's.
?
Ideas?
--
73, Bo W4GHV since '54
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Check out this thread.
?
?
Scroll down and you will find some Amazon links for products I tried. As stated previously, getting off the phone charger products is the key.
?
73
Dave
WB9TEN
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Having a BSEE, I've always wondered why the developers of this Ri5 have a need for the extra +.1v on the 5v input, that the other versions are not critical of. I'm thinking it's to ensure there is ample current available. 5v is ubiquitous in the computer world but the Rpi5 is wanting to need that extra .1 volts. Seems like this could be handled by the circuitry instead of the power source.?
?
Greg
KE5DXA?
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As an EE
you should know the reason. When you use a boost converter to increase the
nominal 5V, you reduce the total current available AND increase chip count
on the board.? The Pi foundation has always stated phone chargers were
not acceptable power sources for any pi product.? They are designed to
charge 3.7V to 4.2V phone batteries.? They may put out 3 amps, but in
doing so, their voltage drops.? The voltage drop is t critical since
the voltage is reduced and regulated to charge the phones
Get
Having a BSEE,
I've always wondered why the developers of this Ri5 have a need for the
extra +.1v on the 5v input, that the other versions are not critical of.
I'm thinking it's to ensure there is ample current available. 5v is
ubiquitous in the computer world but the Rpi5 is wanting to need that extra
.1 volts. Seems like this could be handled by the circuitry instead of the
power source.?
?
Greg
KE5DXA?
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Expensive:?
Slightly less expensive:?
Either one will accept up to 24vdc. Not sure how well the Pi Juice will work with the RP5 though.?
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Show quoted text
On Nov 6, 2024, at 11:44, Michael WA7SKG via groups.io <wa7skg@...> wrote:
? I ended up buying a bunch of buck converters that will take 10-24V in
and give a constant adjustable output. I have a couple devices (like
weather radio) that run from 9V wall warts as well as some RaspberryPis
that need a little over 5V and run everything off of a big 12V power
supply. I set the RPi converters for about 5.3V and never see the little
low voltage warnings.
It has always amazed me with the popularity among hams of the
RaspberryPi that more 12V power solutions are not out there. I loved the
MoPi2 hat, very versatile. But, unfortunately, it was discontinued. I
wish I had bought several of them at the time. It is sad that there is
nothing comparable on the market, especially with the higher power
demands of the newer Pi versions.
Michael WA7SKG
Bo W4GHV wrote on 11/6/24 8:22 AM:
I'm tired of it!
The voltage drop in most or all USB cables is too much.
Hearing about all the 'high current' capability of USB C cables, I
ordered some SHORT one and USB C to micro adapters for my old PI's.
Hopefully a solution.
I have dozens of 5v wall warts and none seem to work. The wires in
normal USB cables are way too small for several amps.
No problems here with supplies provided with my Pi4's.
Ideas?
--
73, Bo W4GHV since '54
|
Michael, which Buck Converters did you purchase? Will they handle 3 and/or 5 a? I have purchased B converters from Amazon but they provide either 2 or 3 amps. The RPI 5 likes 5A. RPI 4 likes 3A.
?
73,
Kirby
KL7VK
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I was
running 2 Pi5's of of one of these without issues. Now that I have a 24
port router with POE+ on all ports, it's been moved back to my project
bench
12A Buck Converter DC 24V to 5V...
https://www.amazon.com/dp/B09MVH3YN6?ref=ppx_pop_mob_ap_share Get
Michael, which
Buck Converters did you purchase? Will they handle 3 and/or 5 a? I have
purchased B converters from Amazon but they provide either 2 or 3 amps. The
RPI 5 likes 5A. RPI 4 likes 3A.
?
73,
Kirby
KL7VK
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Sorry, don't have the details. I bought a 10 pack of them 4 or 5 years
ago. I'm powering some weather radios, a couple Pi-Zeros, and a few
other devices that take random voltage inputs. I think I have one Pi3
using them. Don't have any Pi4 or Pi5 devices. Still doesn't make sense
to me why they insist on continuing to power them via USB sockets.
Utilizing a 12V input is much more robust and almost as universal, much
more versatile, and the hardware and engineering differences are trivial.
Michael WA7SKG
Kirby, KL7VK wrote on 11/6/24 11:32 AM:
toggle quoted message
Show quoted text
Michael, which Buck Converters did you purchase? Will they handle 3
and/or 5 a? I have purchased B converters from Amazon but they provide
either 2 or 3 amps. The RPI 5 likes 5A. RPI 4 likes 3A.
73,
Kirby
KL7VK
|
?
?
- Note: Input different voltage will output different power: input DC 9-24V, output 5.2V/6A/30W; input DC 24-32V, output 5.2V/5A/25W; input DC 32-36V, output 5.2V/3.5A/18W.
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The Raspberry Pi will deliver an "Under-voltage" warning when operating below 4.63 volts, as measured at GPIO pin 2 or 4. In Raspian OS, a lightning bolt appears in the upper right corner of the display.??In Raspberry Pi OS, a "Low voltage warning" text appears in the display upper right corner.??"Under-voltage detected!" is also logged in dmesg for each occurance.
?
Often the cause is too much voltage drop in a poor USB power cable. I have taken apart flimsy USB cables where the wires were not soldered and relied upon the rubber molding to contact the pins.
USE A BEEFY USB CHARGING CABLE designed to fast charge smart phones and laptops.
$5 USB A to C
$6 USB-C to C
?
To see what the Raspberry Pi internally measures on the 5V input, enter on the terminal:
? vcgencmd pmic_read_adc | grep EXT5V_V
You will be surprised at the voltage drop in most USB supply cables!
?
With all USB loads attached, enter in the terminal:
?dmesg | grep Under-voltage
To see if "Under-voltage" is occurring.
??
I have used these to successfully power my RPi5 with NVMe SSD:
$13 YIPIN HEXHA 10-32V DC in to 5.2V 6A dual USB-C
$10 Klnuoxj 8-32V to 5V. 5A. USB-C PD Converter.
?
The RPi5 will run fine with 3A or more at 5V, if there is no USB load, but a 5A 5.2V supply is recommended to draw the maximum 1.6A from the USB ports.
?
The USB-C Power Delivery 3.0 standard specifies 5 volts at 3.0 amperes, but the PD protocol allows for requesting higher current. The Raspberry Pi 5 wall wart acknowledges a PD request for 5 amperes. Normally, the RPi5 is configured to use USB-C Power Delivery (PD) protocol,
to negotiate 5A from the PD capable Raspberry Pi 5.1 volt mains power adapter, and shuts down if it fails to get PD acknowledgement that 5 A is available.
?
Add a line to the config.txt of the Raspberry Pi to ignore the USB Power Delivery communication and assume that the power supply can provide 5v and 5A.
sudo
rpi-eeprom-config –edit Then
add the line:
PSU_MAX_CURRENT=5000
Or add the
following to the end of //firmware/:
usb_max_current_enable=1
Zero if the USB port current limiter was set to the low-limit during boot, non-zero if the high limit was enabled.? Enabled if the USB Power Delivery (PD) supply claims 5A max-current OR if forced in config.txt
?
Forcing the RPi5 boot to ignore Power delivery will allow many 5.2 volt non-PD USB power adapters and automotive USB outlets to power the RPi5.
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That fast charging cable says it is only good to 3.1 amps
"[3.1A Fast Charging]: Supports safe high-speed charging at 3.1A and data syncing speeds up to (480Mb/s). The 56kΩ resistor provides outstandingly reliable conductivity & stability, protecting your devices and charging adapters from damage."
Get
The Raspberry Pi will deliver an "Under-voltage" warning when operating below 4.63 volts, as measured at GPIO pin 2 or 4. In Raspian OS, a lightning bolt appears in the upper right corner of the display.??In Raspberry Pi OS, a "Low voltage warning" text appears in the display upper right corner.??"Under-voltage detected!" is also logged in dmesg for each occurance.
?
Often the cause is too much voltage drop in a poor USB power cable. I have taken apart flimsy USB cables where the wires were not soldered and relied upon the rubber molding to contact the pins.
USE A BEEFY USB CHARGING CABLE designed to fast charge smart phones and laptops.
$5 USB A to C
$6 USB-C to C
?
To see what the Raspberry Pi internally measures on the 5V input, enter on the terminal:
? vcgencmd pmic_read_adc | grep EXT5V_V
You will be surprised at the voltage drop in most USB supply cables!
?
With all USB loads attached, enter in the terminal:
?dmesg | grep Under-voltage
To see if "Under-voltage" is occurring.
??
I have used these to successfully power my RPi5 with NVMe SSD:
$13 YIPIN HEXHA 10-32V DC in to 5.2V 6A dual USB-C
$10 Klnuoxj 8-32V to 5V. 5A. USB-C PD Converter.
?
The RPi5 will run fine with 3A or more at 5V, if there is no USB load, but a 5A 5.2V supply is recommended to draw the maximum 1.6A from the USB ports.
?
The USB-C Power Delivery 3.0 standard specifies 5 volts at 3.0 amperes, but the PD protocol allows for requesting higher current. The Raspberry Pi 5 wall wart acknowledges a PD request for 5 amperes. Normally, the RPi5 is configured to use USB-C Power Delivery (PD) protocol,
to negotiate 5A from the PD capable Raspberry Pi 5.1 volt mains power adapter, and shuts down if it fails to get PD acknowledgement that 5 A is available.
?
Add a line to the config.txt of the Raspberry Pi to ignore the USB Power Delivery communication and assume that the power supply can provide 5v and 5A.
sudo
rpi-eeprom-config –edit Then
add the line:
PSU_MAX_CURRENT=5000
Or add the
following to the end of //firmware/:
usb_max_current_enable=1
Zero if the USB port current limiter was set to the low-limit during boot, non-zero if the high limit was enabled.? Enabled if the USB Power Delivery (PD) supply claims 5A max-current OR if forced in config.txt
?
Forcing the RPi5 boot to ignore Power delivery will allow many 5.2 volt non-PD USB power adapters and automotive USB outlets to power the RPi5.
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Bo W4GHV
Michael WA7SKG
Spence G5STO
mike
Greg Sanders
N0YWB