serLCD-14074 Schematic of the LCD and 3.3V regulator

Components & Accessories Displays
1

I haven’t found a schematic of the LCD (I guess it’s not open source)

but I have a question concerning the 3.3V regulator:

If I supply 5V to RAW, is the LCD able to supply 3.3V for an arduino

pro mini and the SparkFun Lightning Detector - AS3935 SEN-15441?

How many mA can I get out of the LCD regulator?

Thank you for your time

2

Hi Gerard and thanks for posting on the forums.

Unfortunately we don’t have a schematic available for either of the serLCDs we carry. We also don’t recommend using the voltage regulator on the LCD to power other devices, but you’d probably be OK pulling a 50mA load from it.

You’d be a lot safer supplying 5 volts to the RAW pin on the Pro Mini and letting the Pro Mini regulate the voltage down to 3.3 for the LCD and AS3935.

Hope this helps!

3

Thanks for this quick reply. I will follow your advice.