hi guys. to make project more portable i need 2 nanos instead unos. i have 3 pro minis 1 nano. Does the pro mini has Hardware SPI pins just like uno and nano? , my pro mini has 5v led under it is that means its the 5v one??? also how to upload it using an other arduino (fake uno)
Why do you need 2 boards in the first place ?
The arduino pro mini has the same chip as the nano.
it is 5v.
it has hardware SPI
Here is a guide if the uno has a removeable chip: https://www.instructables.com/How-to-Program-Arduino-Pro-Mini-Using-Arduino-UNO/
if you uno has an smd chip (the same one that is on the nano/pro mini) then you need to short the reset and gnd pins on the uno then connect the uno's tx pin to the pro mini's tx pin and the uno's rx pin with the pro mini's rx pin and don't forget the +5V and gnd connections then in arduino IDE select the arduino nano board with old bootloder and hit upload, and when you see "uploading..." quickly press the reset button on the pro mini if it does not upload then try switching the rx/tx lines.
I hope this helps
Be careful
The Pro Mini comes in 2 versions, 5V and 3.3V, hence the question from @gaouser
Why not power the board with say 9V on the RAW pin and measure the voltage on the VCC pin ?
OR look at the crystal and see if it reads 8.000 (3.3v) or 16.000 (5v). If you cannot read the crystal you'll have to do the voltage measurement.
I don't think the crystal frequency can be used as a reliable indicator of whether the board is a 3.3v or 5v version.
If it's an 8mhz crystal then it would suggest a 3.3v system. However there are quite a few 328P boards out there with 16mhz crystals that are 3.3v systems. It means that they are operating outside the manufacturers spec.
Perhaps you are correct, I only suggested the crystal since I've never seen an unmodified "arduino" or clone with 3.3 Regulators and 16 Mhz.
I guess one could use a "standard" 5V / 16 Mhz board and only supply 3.3V but it would still be a "5V board"
So the OP should be cautious about the determination.
I dont have 9v power source... Also is raw = Vin??? if its i can maybe power with uno and read voltage from Analog IN
RAW is the input to the regulator,
Vcc (on my board) is the output of the regulator (typically 5V or 3.3V)
If you make this measurement with the internal A/D you need to set the A/D reference to:
analogReference (INTERNAL);
im gonna read the voltage using analog in. Because it can be used as voltmeter
1023=5v
Near to 600 = 3.3v
0=GND
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