2x Arduino MEGA installed exactly the same way side by side, but one differs

Using Arduino IDE 1.x
1

Hi all,

I have a strange problem and cannot wrap my head around it,

I have sent identical code to both arduino MEGAs and the wiring is the same for both of them, double and tripple checked. I have also swapped LEDs from one mosfet to another and the problem is certainly the MEGA

Essentially my project is a shit tone of lights which react to Thermistors I have LEDs being driven by Mosfets. all leds are lighting up but one of the arduino is a slightly different shade.
I have tried the other sensors i am convinced one MEGA is doing something on a hardware level different to the others

one mega is showing all LEDs to be slightly more red then the other arduino.

I dont want to compensate this by changing the code on 1 arduino..

this seems to be one board has a different output power set for pwm or something.
can anyone help me, where would I set hardware level settings to make both boards become identical?

i am only guessing this is what I need to do.

2

Are the megas different models, ie, is one a clone?

Where is the power being supplied? If it's coming from the mega, have you measured the voltage it's putting out? How much current is it drawing?

3

thank you for your reply,

This is very strange, the problem went away, and I dont know what I did to fix it :stuck_out_tongue:
it would have to be one of the following

things I tried was I added a few more wires to 5V
added few ground wires

and it went away.. I think it was to do with the 5v.. I am using a dc-dc psu and adding more pins to the mega fixed things.. so I think.

If anyone else has this happen I suggest just turn every off and on a few times and just check all wiring. Try the above also.. the 5v

sorry if this is not so clear.
cheers