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Forum Index : Microcontroller and PC projects : [PicoMite] power from a 5V/USB phone battery bank ?
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thwill Guru  Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
Hi folks, Any gotchas regarding powering a PicoMite from one of those battery banks that are designed for recharging phones or can I just connect it up to the micro USB? Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
Should be fine, Tom. The power banks have dc/dc converters to give a constant 5V on the USB outputs. It's not the most efficient way to power a PicoMite from batteries, but it's easy. I've just tried it to find out if it works. :) Batteries (say 7.2V) > converter > 5V >----USB connection---->PicoUSB > converter >3v3 :) The output from the power bank might fail before the voltage drops low enough for the PicoMite to drop out. If your power bank has a display of some sort keep an eye on it. . Edited 2021-11-29 02:38 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10315 |
Some can output 9V or even more for fast charging. I don't know how they know they can do this (state of USB data line?) but to be safe make sure your one is only 5V capable |
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electricat Senior Member  Joined: 30/11/2020 Location: LithuaniaPosts: 299 |
I have few universal power banks 5V, 1A, 2A out, USB type A And I am powering if needed IP cams, Raspberries`s, BBC`s, various Arduino boards, charging phones of course. If device will draw only few mA, they might switch off as some amount of load might be needed. I use them as mobile power sources with no problem. They are simple 5V output, universal mobile banks, but not totally dumb. They have overcharge/overdischarge and low voltage monitoring circuity. My MMBasic 'sand box' |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
I've not come across the higher voltage fast charging ones personally. Perhaps I just don't have classy enough phones to warrant one. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| electricat Senior Member Joined: 30/11/2020 Location: LithuaniaPosts: 299 |
Here is explanation on mentioned more advanced multi voltage power banks and how they work https://missionengineering.com/choosing-a-usb-power-delivery-power-bank/ My MMBasic 'sand box' |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
Ah, that's why I've not come across them. USB-PD (USB-C) only. I've only got the USB-A type. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Cyber Senior Member Joined: 13/01/2019 Location: UkrainePosts: 161 |
Yes, this feature may act like a misfeature, when used with different devices. For example I sometimes power my tiny soldering iron from mobile phone powerbank. And if I turn off my iron with its sitch, I need to replug cable to turn it back on. So yes, these powerbanks will kinda power almost anything, but they are designed for mobile phones in first place. |
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| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
I grabbed a TS80 soldering-iron to use with my Anker QC power-bank for on-machine soldering. Heck, I like it so much that I now use it exclusively  |
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| Cyber Senior Member Joined: 13/01/2019 Location: UkrainePosts: 161 |
Yes, I know the feeling. ) Mine are BT-8U and SH72. BT-8U is the one that can be powered from 5V powerbank, drains about 1A. SH72 needs at least 12V. |
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lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
It's all I use on one of mine, one off the charging banks that can charge 8 devices at once If the usb-c socket is used it knows to supply 5v, or 9v through the data on one of the lines I think I know it does both because it's got a display that shows the voltage and amps on each port in use I also use the same on my proper Raspberry Pi and never had any problems Edited 2021-11-29 18:59 by lew247 |
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| Pluto Guru Joined: 09/06/2017 Location: FinlandPosts: 375 |
I have used this model https://www.aliexpress.com/item/33002361391.html?spm=a2g0s.9042311.0.0.27424c4d5nkTKw. I have tested the single cell model. It can deliver output also when the charger is connected. In this way it can function as an UPS. Many other powerbanks that I have cannot output during charging the power bank. -Outputs 3.3V and 5V to soldering points on the PCB -Switch for On/Off of the output to USB-output. -When switch is "Off" the outputs on the PCB are still powered...and consume power. -Power out also during charging. -Charging current about 500mA. Can be increased to 1000mA if the resistor marked R2 is changed to 1.2k. Either by replacing the on board R2 (2k) or parallelling with an other resistor. -Be careful to insert the battery with correct polarity. I have seen the magic smoke from my first board! I decided to try this model after watching Adreas Spiess testing of several boards. https://www.youtube.com/watch?v=-SJbdPvgQnE |
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