power consumption for 3.2 TFT

Other Hardware Displays
1

I have the Sainsmart 3.2 TFT display and shield working on my Mega 2650 R3. I also need to hook up a sensor that needs 90 ma of the +5. I understand that the Mega doesn't like to provide more than 200ma total off the board.

  1. Is that the right number for the power delivery of the Mega?

  2. Anyone know what the power need is for the display and shield with the SD card inserted to be used? I can't find that information anywhere.

  3. I might also need to hook up a DS3231 real time clock, but I understand that power need is practically negligible.

So, do I need a separate +5 for the external devices, or can the Mega supply enough +5 with a 9V input to the board?

2

I'm not sure about current consumption of that TFT (I have the same but never measured it), but anyway I would recommend an external power supply, 90 mA is quite a lot.

If your 9V power supply can deliver enough current for all your devices together, then you could buy one of those cheap LM2596 step down modules (search on ebay) to power your sensor from the same power supply :slight_smile: