Hi! If somebody can help me, I have a problem to my Arduino Mega2560 power pins (pins that provide 5V) and it is that they provide 4.2V only. Does somebody know what's the problem and how to fix it?
The. +5 is an INPUT. You can't run more than an LED or two from it.
I use one for the LCD and another for a SD card module. Does these modules need more current?
The interesting fact is that one year ago it worked and the electric circuit was the same.
SD card runs over 100mA. It only worked before briefly as the onboard voltage regulator gets hot and the voltage drops. What are you powering this from? I use separate 5v @ 3a power supplies to run my mega projects. I built a power disturbution board that piggy backs onto the terminal shield for solid, dependable, wiring.
What is VIN (what is the source, how many volts)?
I have a 9V 2A DC adapter for the board. If I add a separate 5V source to power those modules it should work, isn't it?
Regulated - or Unregulated (probably "Un-").
Yeah, it's an ordinary DC adaptor.
.
Get a 9V regulated supply.
Or a nice +5v supply and get rid of the wasted heat and limits of the onboard +5 regulator.
Ok. Thank you so much. I'll try to fix it.
If you are putting 9V on the VIN pin or barrel connector and the 5V 1 Watt regulator is dropping 4V, then output current is limited to about 250mA. if the load is greater, the voltage may sag below 5V and the regulator may overheat and shutdown. Can you measure the current into the VIN pin?
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