* fix: compilation error for T1000e

src/helpers/nrf52/T1000eBoard.h

@@ -29,12 +29,16 @@ public:
 
   uint16_t getBattMilliVolts() override {
   #ifdef BATTERY_PIN
+   #ifdef PIN_3V3_EN
     digitalWrite(PIN_3V3_EN, HIGH);
+   #endif
     analogReference(AR_INTERNAL_3_0);
     analogReadResolution(12);
     delay(10);
     float volts = (analogRead(BATTERY_PIN) * ADC_MULTIPLIER * AREF_VOLTAGE) / 4096;
+   #ifdef PIN_3V3_EN
     digitalWrite(PIN_3V3_EN, LOW);
+   #endif
 
     analogReference(AR_DEFAULT);  // put back to default
     analogReadResolution(10);