@ajb2k3 i've tried #include "M5StickCPlus2.h" void setup() { auto cfg = M5.config(); StickCP2.begin(cfg); StickCP2.Display.setRotation(1); StickCP2.Display.setTextColor(RED); StickCP2.Display.setTextDatum(middle_center); StickCP2.Display.setTextFont(&fonts::Orbitron_Light_24); StickCP2.Display.setTextSize(1); StickCP2.Display.drawString("Power LED", StickCP2.Display.width() / 2, StickCP2.Display.height() / 2); } void loop() { // inside power red led control StickCP2.Power.setLed(1); delay(1000); StickCP2.Power.setLed(0); delay(1000); } in arduino, but the display didn't work