I am trying to build a project involving the lora Ra-02 module(433mhz) and an arduino nano. Upon searching (on the data sheet) I found out that the lora consumes more current than the output 3.3v on the nano. Should i be able to power the lora just fine from the nano (if so does it have any repercussions?) or will i have to use a seperate power supply ?
well you said
so no... you need a separate power supply.
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Thanks for your reply ! I Must say that i am a beginner in this field and only asked (just to confirm ) because there were so many conflicting results on the web...
Well than, for a separate power supply could i use some thing which outputs an excess of current ( module needs 100ma max ) say 800ma (and 3.3v ) and still be fine or will i risk damaging the module
your module with "eat up" what it needs in terms of current. It's fine if you hook up something that can provide way more than needed.
Indeed You could just connect a step down converter (buck module) to the 5V pin of the Nano and "build" 3.3V to feed into the Lora module.
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Okay, will do thanks! I was originally going to power the buck module with a separate power supply (battery pack) but i could just do what you recommend instead.
Your other topic on the same subject deleted.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
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Thank you.
Hi, as my recent post got deleted....
I apologise for not sticking with the fourum guide lines.
I need to power the lora module(3.3v) and other modules (5v I2C lcd) and was thinking on using a boost module to step the voltage to 5v (for the lcd) and a buckmodule to step down the voltage to 3.3 v for the lora. Upon doing more research i found out that buck and boost modules produce rather high ammounts of noise.... will this effect the lora module that much? If it does do you think that it is better to use a linear psu system with voltage regulators? (I was initially trying to avoid this system because my project is intended to be battery powered and enclosed so power efficiency and heat dissipation are important factors to consider)
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Yes its possible.
Some power switchers can generate enough RFI to significantly affect in particular LoRa long distance settings.
I see... but being battery powered and in an enclosed space were ventialation is almost non existant would it still be wise to implement leniar regulators? Giving regulators tend to heat up significantly and waste more power (power is limited) ?
And regarding the noise issue will this only effect range or will it potentially damage the module? In turn can something be done to potentially decrease noise emitted ?
"and others"
How many things need to be powered and at what voltages and currents?
Are you using a regular nano or the every or one of the other nanos?
I need to power a lora Ra-02 module at 3.3v (current 93ma ) and An I2C 16x2 lcd screen at 5v (dont not know the current consumbtion thus i plan on using something that gives out some excess current to be sure)
I am using a regular nano (hence the separate power supply as the pins cant not cope with the current draw)
A linear regulator with 5V in and 3.3V out may be perfectly acceptable.
That LoRa draws only draws 93mA when transmitting, when receiving it's 12mA
So the regulator will dissipate about 20mW when receiving and 158mW when transmitting, that is not a lot in either case.
If you are only transmitting 50% of the time, the heat dissipation is only 158/2 = 79mW.
So a 5V boost and a 3.3V linear regulator should be OK but don't go overboard with the maximum current for the boost regulator. In general, a 2A regulator will regulate better at 1A than a 5A regulator will.
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I think this is the best option, as it will reduce interference and if it does not produce that much heat and consume that much power as you stated it will be perfect for my particular need.
Thankyou !
Having resolved the problem regarding powering the lora Ra-02 modules, I am now researching which logic level converter (8channel) is best to implement, one which preferably has a fast processing speed and will not delay messages between the modules. Do you have any recommendations as to which model would be best?
Thank you
Use a 74AHC541 to go from 5V to 3.3V, power it with 3.3V
Use a 74AHCT541 to go from 3.3V to 5V, power it with 5V
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