I do that, pin 4 and 6.
I have it hooked to a buck converter on my solar panel pol thing.
I have a capacitor in just to be save for fluctioations.
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Your Raspberry Pi Projects
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I have it hooked to a buck converter on my solar panel pol thing.
I have a capacitor in just to be save for fluctioations.
MidnightZA
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Like this?
Yes, what Im more paranoid about is the possibility of frying the pi. ie if the buck converter somehow fails and 12V goes straight into the header.
Do you have any protection before/after the buck converter?
Not really - the buck, is the protection. On a serious note, the one I use has a mossfet thing in inline if I am not mistaken.
I used a voltmeter to check and it remained at 5V consistently, i also have an ADS1115 ADC, and that logs the voltage every 5 seconds and it is very stable in my findings.
rrh
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I have decided to go Hunter 24V for the valves for my irrigation system and, as a result, need some assistance with the following: what relay boards are recommended in order to obviate the need for things like snubber circuits ?
georgelza
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anyone know of any RPi4B 8Gb's available ?
G
G
Think there's still a worldwide shortage. I couldn't find one anywhere several months ago. Sounds like nothing's changed.
B-1
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There was a few floating around a few weeks ago but they went quick and I believe we will only start getting stock in Jan again.
georgelza
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I have a store that agreed to keep units for me when they get stock… expected November.
If I find earlier will pickup what I can…
got the PoE HAT’s already.
Got 1 unit of the storage in the way to confirm it works and then design brackets to hold it… so all prep phases.
G
If I find earlier will pickup what I can…
got the PoE HAT’s already.
Got 1 unit of the storage in the way to confirm it works and then design brackets to hold it… so all prep phases.
G
MidnightZA
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My buck converters finally arrived from BG. Got delayed by more than a week.
Can I use breadboard jumper wires to power the pi? Are those thin wires able to handle the amps of the pi?
Should be fine, I use normal scooby dooby wire, but that is solid copper, not sure if the breadboard wire is strands to solid copper
Cut a lan cable and use that wire, that is what I do.
MidnightZA
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I tried connecting it up yesterday but my Pi wouldn't power on. I got a Gizzu UPS. I set the DC port to 5V and used a barrel jack connector with the jumper wires but it didn't work.
It could be the jumper wires cant handle the load or the Gizzu cant power the ONT, Router and Pi at the same time (if it has a shared 3A output between both the DC ports)
Doubt that Gizzu would push out enough Amps for a Pi 4. How many devices are gonna provide like 3A on the DC port? The spec sheet should confirm this tho. If it does output enough current, then it's your wiring or converter that's at fault.
Magandroid
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Try Communica. We bought 2x 4GB and 2x 8GB for testing about 3 weeks ago.
MidnightZA
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GIZZU 36W 32Wh 8800mAh Mini Dual DC UPS Black - Works with Routers, VOIP Phones
The GIZZU Mini 8800mAh Dual-voltage DC UPS allows you to power VArious devices from IP cameras to cordless home phones and routers. It features 4 high capacity lithium-ion batteries for a total of 8800mAh battery power capacity for all your charging needs. Power your CPE (Fibre Box) and Router...
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According to loot and other retailers it does output 5V 3A. I'm guessing its 3A between both DC ports. I currently have my modem and ONT on 1 DC port. Both probably draws around 1.5A in total at 12V. I have no way to test it.
My guess is that the jumper wires cant handle the load. I ruled out my wiring and the converter. I used the same setup to power an esp8266 at 5V from the same UPS to test.
You need to wire your multimeter in series to test the current. Or get one of those usb things that you plug in before your device. You're probably right tho - most devices quote total current across multiple ports.
ESP isn't a good test - those things sip power.
MidnightZA
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My DMM doesnt have the option to test current unfortunately (Its this one). I gave up trying to power my Pi from the Gizzu. Im looking for other options now to power my Pi during power outages. If you have any ideas let me know.
I am trying to avoid using my alarm battery with a 12V to 5V converter, although it may seem like that is the simplest route.
Magandroid
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You could try something like this. It has 5V/3A USB Type-C output. We only tested this with 15" laptops with Type-C power ports and we could get about +-4hours out of it. This was about 3 years ago. We never tested it with the Raspberry Pi's as they are attached to a UPS. I would think that A Raspberry Pi uses much less power than a laptop so would last even longer.
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MidnightZA
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You could try something like this. It has 5V/3A USB Type-C output. We only tested this with 15" laptops with Type-C power ports and we could get about +-4hours out of it. This was about 3 years ago. We never tested it with the Raspberry Pi's as they are attached to a UPS. I would think that A Raspberry Pi uses much less power than a laptop so would last even longer.
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I considered a power bank, but I read a lot of power banks don't have the passthrough feature, and cant charge and discharge at the same time
I have 3 power banks at home and I tested all with the Pi and all don't work. I would prefer powering via USB, I feel very anxious powering via the header. If 1 thing goes wrong Ill fry my Pi
You could try something like this. It has 5V/3A USB Type-C output. We only tested this with 15" laptops with Type-C power ports and we could get about +-4hours out of it. This was about 3 years ago. We never tested it with the Raspberry Pi's as they are attached to a UPS. I would think that A Raspberry Pi uses much less power than a laptop so would last even longer.
Takealot.com: Online Shopping | SA's leading online store
South Africa's leading online store. Fast, reliable delivery to your door. Many ways to pay. Shop anything you can imagine: TVs, laptops, cellphones, kitchen appliances, toys, books, beauty & more. Shop the mobile app anytime, anywhere.
The problem with power banks is that most of them won't give you the high current unless your device 'tells' them it supports a high-power charging protocol like QC3 or PD. (You can get a device that 'fakes' this signal from China - been meaning to buy one but I don't really need it right now. My Pi doesn't need to stay on).
Honestly there's no simple method for a Pi - either use a powerbank with a QC3 or PD 'decoy' (or whatever it's called) or run power directly off a 12 V battery (eg. Alarm/ups battery) via buck converter or get an inverter and use AC. (eg. UPS or standalone inverter).
Or you can get those "UPS hats" for Pi that include some charge and switching circuits and a slot for an 18650 Li-ion battery. I've seen them around Banggood and those places. Doubt that would power a Pi 4 for very long.
Or get a custom Li-ion battery pack made. This is a very tempting option but those things are dangerous!
MidnightZA
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My Pi doesn't need to stay on, its just more convenient for home assistant though
I bit the bullet and got a Romoss Sense8+ 30000mAh from takealot, and slapped on a R300 voucher. A good option for R500.
ROMOSS SENSE 8P+ Power Bank
www.powerbankexpert.com
This site says it can power the Pi. Its a bit overkill but then I can at least charge my phone in emergencies if there is extended power outages.