Arduino PRO Mini problem

Projects General Guidance
1

Hi, Im trying to build a 'gaming console' with Arduino. I started the project with Arduino UNO knowing that eventually I would like to replace it with something smaller, so I ordered Arduino Pro Mini. I finished the project (On Uno) thinking that now I will just rewire to Arduino Pro Mini and it's gonna work, but it's not and I have no clue why.

Things that might be useful:

  1. I programmed the Arduino Pro Mini following this: https://www.instructables.com/Program-Arduino-Pro-Mini-Using-Arduino-Uno/
    I tested other programs from the examples, like Fade.ino and it works on the Mini Pro (Tested with every pin Im using [10, 11, 13]).

  2. Im using Arduino Pro Mini 5V 16MHz

  3. What I noticed is that when I program the Pro Mini and just plug in the VIN and GND the LED is constantly ON, but as soon as I plug in the Display the LED starts to blink. And then It only blinks even after I remove the display.

  4. I checked the voltage through out the whole console and everywhere is 5V as it should.

  5. Im not changing the program in any way. I upload the same program on UNO and on Pro Mini. The pins (10 CS, 11 DIN, 13 SCK) should be the same on both devices.

  6. I bought Arduino Pro Mini here:
    Arduino Pro Mini, ATmega328PB TQFP 5V 16MHz + datasheet | LaskaKit

Arduino UNO working fine (It's snake game :smile: )

uno
uno1536×2048 483 KB

Arduino Pro Mini doing what it wants

promini
promini1536×2048 416 KB

If you have any idea about what could be wrong or need more info please let me know. :slight_smile:

2

Please post schematics and code according to How to get the best out of this forum - Using Arduino / Introductory Tutorials - Arduino Forum

3

missed something. Sorry!

4
  • Is the 5v converter O/P going to Vin ? :scream:

IMG_3088
IMG_30881962×1494 597 KB

1 Like
5

Yes, this wire is connected to VIN

6
  • The Vin pin requires an input voltage between 7V to 12V, 7v to 9v is better.
    5V is too low on Vin.
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7

Well it works for the Uno so I would expect it's gonna work for the Pro Mini aswell, but I can certainly try that. Thank you for the feedback

8

Unfortunately, you've been mislead. Even the Arduino spec's say so:
https://docs.arduino.cc/learn/electronics/power-pins/

1 Like
9

Ok I changed it to 7V but it still doesn't work. The display is not doing the right thing

10

Looks to me like the black wire is going to a terminal marked Vin and the red wire" highlightled with green arrow" is going to A0

11

Ok I solved the problem just by recconecting the VCC to RAW.

12

Using 5V power I hope.

I didn't notice originally, but in your first post the Pro Mini is described as Atmega328PB, and the listing agrees. But the pictures of the module in the listing have a 328P marking on the chip, which is standard for a Pro Mini. How is your chip actually marked?

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