while I am thinking how to design my first gsm phone vintage arduino based project, I'd like to better understand how power sources works and how to choose the best battery for any portable future projects being new to the arduino.
If I have multiple modules requiring different or same voltages but with different watt requirements (for example the arduino nano/uno and the gsm module and the LCD), can I use a single 3,7v (example 1500 or 2500mah) Lion mobile phone battery with a protection charger circuit module and a step-UP regulator to power for example both 5V boards?
Or the 5V output line of the arduino is enough for most shields and modules and it depends on the battery size?
Cause I'd like to have one only battery for every components and not adding more battery depending on the project. I understand obviously the 9V classic alkaline battery is low on mAh so I can't use it for any portable project.
If you are thinking of using a 1s LiPo battery (3.7v) consider using a 3.3v Arduino that runs at 8MHz. It will quite happily work with the 3.7v fed to the 3.3v pin (the pin that would be 5v on a 5v Arduino) and that avoids the energy waste of voltage conversion.
Also running at 8Mhz uses less energy compared to 16MHz.
Just be careful to make sure any peripherals are happy with 3.7v.
Robin2:
If you are thinking of using a 1s LiPo battery (3.7v) consider using a 3.3v Arduino that runs at 8MHz. It will quite happily work with the 3.7v fed to the 3.3v pin (the pin that would be 5v on a 5v Arduino) and that avoids the energy waste of voltage conversion.
Also running at 8Mhz uses less energy compared to 16MHz.
Just be careful to make sure any peripherals are happy with 3.7v.
...R
Thanks for the answer.
In that 3,3v version, a high power module like those gsm ones, asking for 2A would work if connected to the arduino 3,3v with such high watt requirement? Or anyway it would be better to connect any high power module directly to the 3,7v battery to not break any arduino pins?
Until now I only have bought two UNO boards (both rev3 one generic with the soldered microcontroller and a 12Mhz frequency and one official in its official kit with the usual 16Mhz one) and a NANO v3 I don't know at which frequency it will run being a generic.
I was thinking the NANO had 5V requirement itself having the mini-usb connector (?) or are there different versions? If I understood correctly the UNO works always @ 5V. I still have to read some manual/datasheet yet.
I'd like to make any portable projects using a single battery LiPo/LiOn or Ni-Mh and saving some space for the plastic case sizes and not worrying about different power sources. For the 5V boards, what about the 4xAA Ni-Mh alternative solution using rechargable 1,2v-AA cells?
Also another thing I don't understand is when any battery is connected for example the usual 3,7v Li-Po, would it be possible to recharge the battery while it's still connected and powering the shields/modules using the protection circuit at the same time?
f82:
In that 3,3v version, a high power module like those gsm ones, asking for 2A would work if connected to the arduino 3,3v with such high watt requirement? Or anyway it would be better to connect any high power module directly to the 3,7v battery to not break any arduino pins?
I'm not sure what you mean but, in general, you should never draw power for high-power external devices through an Arduino.
I was thinking the NANO had 5V requirement itself having the mini-usb connector (?) or are there different versions?
I don't know about Nanos, I don't have any. You can certainly get 3.3v ProMicros. All my 8Mhz projects just use an Atmega 328 chip on a piece of strip board.
Robin2:
I'm not sure what you mean but, in general, you should never draw power for high-power external devices through an Arduino.
I don't know about Nanos, I don't have any. You can certainly get 3.3v ProMicros. All my 8Mhz projects just use an Atmega 328 chip on a piece of strip board.
...R
Sorry for my bad english. I meant that if I'd try to power a shield/module using the 5V or 3,3v pins of the Arduino, beside the battery capacity or its voltage or even if it was an external power supply, would the arduino be capable to deliver something like 5V/2A required by that shield/module only from the Arduino voltage output internal pin on its board? I imagine such modules with higher watt required would be better powered directly from the power source (I was also thinking like for example a 5V micro-usb rechargable external battery pack for mobile phones that should have also the protection circuits already inside?)
The Nano I'll get should work at 5V but I'll consider also the 3,3v versions mentioned, thank you.
f82:
would the arduino be capable to deliver something like 5V/2A required by that shield/module only from the Arduino voltage output internal pin on its board?
NO.
In Reply #3 I said "never draw power for high-power external devices through an Arduino."
In Reply #3 I said "never draw power for high-power external devices through an Arduino."
...R
Thank you. I imagined that reading some older projects comments but I've seen some tutorial where people powered it that way using the 5V pin out and lowering the voltage with a component like it was enough and I imagined it was something wrong.
