Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/t1000-e/T1000eBoard.h

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <MeshCore.h>
+#include <Arduino.h>
+#include <helpers/NRF52Board.h>
+
+class T1000eBoard : public NRF52BoardDCDC {
+protected:
+  uint8_t btn_prev_state;
+
+public:
+  T1000eBoard() : NRF52Board("T1000E_OTA") {}
+  void begin();
+
+  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);
+
+    return volts * 1000;
+  #else
+    return 0;
+  #endif
+  }
+
+  const char* getManufacturerName() const override {
+    return "Seeed Tracker T1000-E";
+  }
+
+  int buttonStateChanged() {
+  #ifdef BUTTON_PIN
+    uint8_t v = digitalRead(BUTTON_PIN);
+    if (v != btn_prev_state) {
+      btn_prev_state = v;
+      return (v == USER_BTN_PRESSED) ? 1 : -1;
+    }
+  #endif
+    return 0;
+  }
+
+  void powerOff() override {
+    #ifdef HAS_GPS
+        digitalWrite(GPS_VRTC_EN, LOW);
+        digitalWrite(GPS_RESET, LOW);
+        digitalWrite(GPS_SLEEP_INT, LOW);
+        digitalWrite(GPS_RTC_INT, LOW);
+        digitalWrite(GPS_EN, LOW);
+    #endif
+
+    #ifdef BUZZER_EN
+        digitalWrite(BUZZER_EN, LOW);
+    #endif
+
+    #ifdef PIN_3V3_EN
+        digitalWrite(PIN_3V3_EN, LOW);
+    #endif
+
+    #ifdef PIN_3V3_ACC_EN
+        digitalWrite(PIN_3V3_ACC_EN, LOW);
+    #endif
+    #ifdef SENSOR_EN
+        digitalWrite(SENSOR_EN, LOW);
+    #endif
+
+    // set led on and wait for button release before poweroff
+    #ifdef LED_PIN
+    digitalWrite(LED_PIN, HIGH);
+    #endif
+    #ifdef BUTTON_PIN
+    while(digitalRead(BUTTON_PIN));
+    #endif
+    #ifdef LED_PIN
+    digitalWrite(LED_PIN, LOW);
+    #endif
+
+    #ifdef BUTTON_PIN
+    nrf_gpio_cfg_sense_input(BUTTON_PIN, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_HIGH);
+    #endif
+
+    sd_power_system_off();
+  }
+};