Version 1.0

Initial version.

src/main.cpp

@@ -0,0 +1,84 @@
+#include "Arduino.h"
+#include "Arduino_FreeRTOS.h"
+#include "Adafruit_BMP280.h"
+#include "RF24.h"
+
+typedef struct
+{
+  int16_t sensor_id{0};
+  int16_t sensor_type{0};
+  int16_t value_1{0};
+  int16_t value_2{0};
+  int16_t value_3{0};
+  int16_t value_4{0};
+  int16_t value_5{0};
+} transmitted_data_t;
+
+void sendSensorsValue(void *pvParameters);
+float getBatteryLevelCharge(void);
+
+RF24 radio(9, 10);
+Adafruit_BMP280 bmp;
+
+void setup()
+{
+  ADCSRA &= ~(1 << ADEN);
+  radio.begin();
+  radio.setChannel(120);
+  radio.setDataRate(RF24_250KBPS);
+  radio.setPALevel(RF24_PA_MAX);
+  radio.setPayloadSize(14);
+  radio.setAddressWidth(3);
+  radio.setCRCLength(RF24_CRC_8);
+  radio.setRetries(15, 15);
+  radio.openWritingPipe(0xDDEEFF);
+  radio.powerDown();
+  bmp.begin(0x76);
+  bmp.setSampling(Adafruit_BMP280::MODE_FORCED,
+                  Adafruit_BMP280::SAMPLING_X16,
+                  Adafruit_BMP280::SAMPLING_X16,
+                  Adafruit_BMP280::FILTER_X16);
+  xTaskCreate(sendSensorsValue, "Send Sensors Value", configMINIMAL_STACK_SIZE, NULL, 1, NULL);
+}
+
+void loop()
+{
+  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+  portENTER_CRITICAL();
+  sleep_enable();
+  portEXIT_CRITICAL();
+  sleep_cpu();
+  sleep_reset();
+}
+
+void sendSensorsValue(void *pvParameters)
+{
+  (void)pvParameters;
+  for (;;)
+  {
+    transmitted_data_t sensor{abs((int16_t)ID), BMP280};
+    bmp.takeForcedMeasurement();
+    sensor.value_1 = getBatteryLevelCharge() * 100;
+    sensor.value_2 = bmp.readTemperature();
+    sensor.value_3 = bmp.readPressure() * 0.00750062;
+    radio.powerUp();
+    radio.flush_tx();
+    radio.write(&sensor, sizeof(transmitted_data_t));
+    radio.powerDown();
+    vTaskDelay(300);
+  }
+  vTaskDelete(NULL);
+}
+
+float getBatteryLevelCharge()
+{
+  ADMUX = (1 << REFS0) | (1 << MUX3) | (1 << MUX2) | (1 << MUX1);
+  ADCSRA |= (1 << ADEN);
+  delay(10);
+  ADCSRA |= (1 << ADSC);
+  while (bit_is_set(ADCSRA, ADSC))
+    ;
+  ADCSRA &= ~(1 << ADEN);
+  float value = ((1024 * 1.1) / (ADCL + ADCH * 256));
+  return value;
+}