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by HawaiianPi
Sun Apr 12, 2020 2:23 am
Forum: Troubleshooting
Topic: Confused by under voltage
Replies: 5
Views: 254

Re: Confused by under voltage

The 12V DC-DC voltage converter you have is listed as a charger, not a power supply. Charging phone or tablet batteries does not require precise voltage regulation, and because of that, many chargers will not maintain a stable 5V under load. For this reason chargers are not recommended ...
by HyFy
Tue Apr 07, 2020 8:15 pm
Forum: Automation, sensing and robotics
Topic: SOLVED Testing a remote/unavailable serial input using virtual serial ports. SOLVED
Replies: 0
Views: 175

SOLVED Testing a remote/unavailable serial input using virtual serial ports. SOLVED

... home. During the winter it is apparent that the solar panel input in not sufficient to maintain the state of charge of the pair of 120Ah 12 volt batteries fitted to the vehicle. Last winter the SOC got dangerously low and was near to destroying the future effectiveness of the batteries (GBP700+). ...
by stan_qaz
Tue Apr 07, 2020 6:17 pm
Forum: General discussion
Topic: Operation Voltage
Replies: 10
Views: 469

Re: Operation Voltage

Maybe not two batteries but two power supplies powered by one battery? An 11 Volt battery, unless way undersized for the current draw, should have no problem supplying a good 5 Volt regulator.
by cpu
Mon Apr 06, 2020 3:09 pm
Forum: General discussion
Topic: Schematics for RPI 2B anywhere?
Replies: 6
Views: 310

Schematics for RPI 2B anywhere?

... I have a fairly old RPI 2B which is good for the job, so I don't want to change it for a Pi 3 or Pi 4 (power is very limited, IoT application, batteries!). However, I have intermittent problems with WLAN/WiFi through a USB stick (dongle). Sometimes it works, sometimes it does not even request ...
by HawaiianPi
Sat Apr 04, 2020 8:56 pm
Forum: Raspberry Pi OS
Topic: Battery Monitor always at 0%.
Replies: 10
Views: 360

Re: Battery Monitor always at 0%.

... find in a true mobile computing device (laptop, tablet, smartphone). They simply aren't engineered for mobile/battery use. You can use them on batteries if you want, but they can't magically read the state of a battery in another product. Any battery device connected to the Pi would have to ...
by JoppeDC
Sat Apr 04, 2020 6:21 pm
Forum: Other projects
Topic: power Raspberry Pi using Battery Packs
Replies: 0
Views: 150

power Raspberry Pi using Battery Packs

Hi, The last few days i've been searching for a way to power my pi using a set of 18650 batteries. I've read several threads on this topic, but couldn't find a plug and play solution. I basically need a step up from 3.7 - 4.2V to 5V 3A. I've found several devices, but ...
by fishcounter
Sat Apr 04, 2020 3:16 pm
Forum: Troubleshooting
Topic: Bluetooth or WiFi? I can't use them simultaneously
Replies: 4
Views: 249

Re: Bluetooth or WiFi? I can't use them simultaneously

... problem started right after I set up the OS, it was intermittent but within an hour I had lost all ability to input by bluetooth. I thought the batteries might be weak in my keyboard so I put new batteries in the keyboard. That didn't work so I tried an apple keyboard with new batteries. That ...
by rpdom
Sat Apr 04, 2020 10:20 am
Forum: Raspberry Pi OS
Topic: Battery Monitor always at 0%.
Replies: 10
Views: 360

Re: Battery Monitor always at 0%.

Desktop computers don't tend to run on batteries. The Pi is not designed to run on batteries either.
by PhatFil
Sat Apr 04, 2020 1:34 am
Forum: Troubleshooting
Topic: Bluetooth or WiFi? I can't use them simultaneously
Replies: 4
Views: 249

Re: Bluetooth or WiFi? I can't use them simultaneously

... my 3b works with b/tooth and wifi concurrently ok i query ble sensors every couple of minutes and broadcast the results over wifi.. #1 check the batteries in your keyboard B/tooth can drain power pretty quickly.. and a low broadcast strength could be the issue? (guess work but easy to rule out) ...
by Bluebird
Fri Apr 03, 2020 3:06 pm
Forum: Advanced users
Topic: Using APCUPSD to shutdown raspberry pi and multiple synologies
Replies: 0
Views: 83

Using APCUPSD to shutdown raspberry pi and multiple synologies

... Everything is connected to a APC SMT2200 and i would like to shutdown all Synologies and also the Raspberry Pi itself when the APC goes on batteries or when they are low. When power comes up again i would like to have them restarted. I have installed APCUPSD and i think i can read data ...
by Imperf3kt
Fri Apr 03, 2020 7:56 am
Forum: Troubleshooting
Topic: Power from battery pack cutting out
Replies: 2
Views: 123

Re: Power from battery pack cutting out

It's the current, a 9v battery can't supply the amps a Pi is trying to draw.

Some useful info here (I haven't read this thoroughly, only skimmed the first few answers)
https://electronics.stackexchange.com/q ... -batteries
by W. H. Heydt
Fri Apr 03, 2020 4:30 am
Forum: Troubleshooting
Topic: Power from battery pack cutting out
Replies: 2
Views: 123

Re: Power from battery pack cutting out

... of Pi your are using. No one can tell if your power supply is sufficient without knowing what model of Pi you are trying to power. What sort of batteries are you using? What is their Ah capacity? What is their rated current drain? And last, but not least, what is the wire gauge specification ...
by dustnbone
Wed Apr 01, 2020 11:28 pm
Forum: Troubleshooting
Topic: Pi4 USB Power
Replies: 2
Views: 128

Re: Pi4 USB Power

It's possible the USB power banks output voltage is dropping too low under load, it might be OK initially but as the batteries drain it's not able to cope with the load while maintaining output voltage. Do you know how much current the modems are drawing while in use? If you add ...
by mwrich4
Tue Mar 31, 2020 4:40 am
Forum: General discussion
Topic: Two stepper motor with A4988
Replies: 2
Views: 148

Re: Two stepper motor with A4988

it sounds like your supply can't give the RasPi what it needs when both motors run. Perhaps a reasonable capacitor might help if the batteries don't have a high peak current output. Single AA's seem to give about 4A in a short (20A range on multimeter) Make a little monitor circuit that ...
by HawaiianPi
Mon Mar 30, 2020 7:50 pm
Forum: General discussion
Topic: Using samsung fast charge for RPI3 B+
Replies: 16
Views: 696

Re: Using samsung fast charge for RPI3 B+

The problem with chargers is that charging batteries does not require precise voltage regulation, and because of that chargers often have poor regulation that will not maintain a stable 5V under load. I used to have a "5V/2.4A" charger that dipped ...
by PhatFil
Mon Mar 30, 2020 2:29 pm
Forum: General discussion
Topic: I am looking for a wireless system/application.
Replies: 5
Views: 269

Re: I am looking for a wireless system/application.

check out posts and forums devoted to home automation.. for example I use buttons like these that run off cr2032 batteries https://ae01.alicdn.com/kf/H759cfd1bddad4dafa63974542485f988l.jpg they broadcast a code via 433mhz rf using a basic protocol. You can attach a 433mhz receiver ...
by W. H. Heydt
Sun Mar 29, 2020 9:43 pm
Forum: General discussion
Topic: Rpi 3B+: how cold can it still opperate?
Replies: 21
Views: 820

Re: Rpi 3B+: how cold can it still opperate?

... that didn't follow the link to the blog post about using a Pi to count penguins in Antarctica. the Pi worked just fine down to -42'C...when the batteries froze. For the OP...doubt you're going to have a thermal problem with the Pi. You'll be out of spec, so not relying on a given board until ...
by wh7qq
Sun Mar 29, 2020 9:11 pm
Forum: General discussion
Topic: Power Bank for my emulator
Replies: 2
Views: 166

Re: Power Bank for my emulator

... advised that many so called power banks do not have regulation to keep output within the RPi's narrow voltage band but only to charge cell phone batteries. I suggest you search this forum and other sources on the topic and make some decisions on your specifications before asking further questions. ...
by Imperf3kt
Sun Mar 29, 2020 8:51 pm
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 3152

Re: Call for help: looking to start a company - solar powered computer

... battery as long as the charger was connected. You'll probably find that 99% of smartphone from the last decade use lithium ion or lithium Polymer batteries. Quite easily found or ordered in any shape/size you need. Certainly much more feasible than inventing an entire product.
by bensimmo
Sun Mar 29, 2020 8:03 pm
Forum: General discussion
Topic: Powering Pi Zero with AA batteries
Replies: 29
Views: 2560

Re: Powering Pi Zero with AA batteries

Definitely go for a buck converter that are recommended for SBC projects: https://www.adafruit.com/product/2190 https://www.piborg.org/power-1137/battborg That adafruit one is a buck-boost, so significantly less efficient than a buck converter, and it's only good for 1A and costs 10 USD. The piborg...
by tweak42
Sun Mar 29, 2020 6:59 pm
Forum: General discussion
Topic: Powering Pi Zero with AA batteries
Replies: 29
Views: 2560

Re: Powering Pi Zero with AA batteries

Why not use a USB power bank. A small unit will be roughly the same size as 4 x AA in a case and give better life and without the need for step-down transformers. I run a Pi 3B+ with a 10000mah power bank and it runs for a long time. The OP said it needed to be AA cells because LiPo cells would be ...
by Gavinmc42
Sun Mar 29, 2020 3:55 am
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 3152

Re: Call for help: looking to start a company - solar powered computer

Depends on the battery technology. Phone batteries last until the next model which is 6 months ;) Some chemistries will last 100 years+, Nickel Iron. Lithium Titanite is good for 20years 20,000 cycles. Lead based ones might last a few-5 years ...
by portis
Sat Mar 28, 2020 3:55 pm
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 3152

Re: Call for help: looking to start a company - solar powered computer

... of wifi usage. And battery replacements are hard to find. Which is why my project stated the device should be built to work mostly on solar. IF batteries needed (for exemple for nightime usage in case another source of light is not available - my solar powered calculator works on solar at night ...
by HyFy
Sat Mar 28, 2020 2:21 pm
Forum: Networking and servers
Topic: (SOLVED) Using Gammu to send automatic SMS with a variable as the message content (SOLVED)
Replies: 1
Views: 516

Re: (SOLVED) Using Gammu to send automatic SMS with a variable as the message content (SOLVED)

... or so, the 6 paramters above are overwritten in SMS.txt until twice a day the line in SMS.txt is read and sent to my mobile. I can say that the batteries are at 14.3 volts, charging at 1.499 amps (21 watts). There is a cumulative energy consumption of 0 amp hours. The overall state of charge ...
by PhatFil
Sat Mar 28, 2020 5:15 am
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 3152

Re: Call for help: looking to start a company - solar powered computer

... sub??? A land line (aka POTS line) works in many kinds of disasters when the cell towers all fail because they have no external power and the batteries go flat after about 8 hours. So...I pay a monthly phone "sub". (I live in earthquake country...what kinds of disasters strike where you live?) ...

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