modified T114 code to disable many unused peripherals, and set up the LOWPWR power mode. all changes should be quite safe, but testing for a couple days just in case.

src/helpers/nrf52/T114Board.cpp

@@ -26,6 +26,45 @@ void T114Board::begin() {
 
   pinMode(PIN_VBAT_READ, INPUT);
 
+  // Enable SoftDevice low-power mode
+  sd_power_mode_set(NRF_POWER_MODE_LOWPWR);
+
+  // Enable DC/DC converter for better efficiency (REG1 stage)
+  NRF_POWER->DCDCEN = 1;
+
+  // Power down unused communication peripherals
+  // UART1 - Not used on T114
+  NRF_UARTE1->ENABLE = 0;
+
+  // SPIM2/SPIS2 - Not used (SPI is on SPIM0)
+  NRF_SPIM2->ENABLE = 0;
+  NRF_SPIS2->ENABLE = 0;
+
+  // TWI1 (I2C1) - Not used (I2C is on TWI0)
+  NRF_TWIM1->ENABLE = 0;
+  NRF_TWIS1->ENABLE = 0;
+
+  // PWM modules - Not used for standard T114 functions
+  NRF_PWM1->ENABLE = 0;
+  NRF_PWM2->ENABLE = 0;
+  NRF_PWM3->ENABLE = 0;
+
+  // PDM (Digital Microphone Interface) - Not used
+  NRF_PDM->ENABLE = 0;
+
+  // I2S - Not used
+  NRF_I2S->ENABLE = 0;
+
+  // QSPI - Not used (no external flash)
+  NRF_QSPI->ENABLE = 0;
+
+  // Disable unused analog peripherals
+  // SAADC channels - only keep what's needed for battery monitoring
+  NRF_SAADC->ENABLE = 0;  // Re-enable only when needed for measurements
+
+  // COMP - Comparator not used
+  NRF_COMP->ENABLE = 0;
+
 #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
   Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL);
 #endif

src/helpers/nrf52/T114Board.h

@@ -40,6 +40,9 @@ public:
 
   uint16_t getBattMilliVolts() override {
     int adcvalue = 0;
+
+    NRF_SAADC->ENABLE = 1;
+
     analogReadResolution(12);
     analogReference(AR_INTERNAL_3_0);
     pinMode(PIN_BAT_CTL, OUTPUT);          // battery adc can be read only ctrl pin 6 set to high
@@ -49,6 +52,8 @@ public:
     adcvalue = analogRead(PIN_VBAT_READ);
     digitalWrite(6, 0);
 
+    NRF_SAADC->ENABLE = 0;
+
     return (uint16_t)((float)adcvalue * MV_LSB * 4.9);
   }