Version 1.0

Initial version.

.gitignore

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+.pio
+.vscode
+.DS_Store

README.md

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-# RF-Climate-Sensor-BMP280
+# RF climate sensor (BMP280)
 
+Climate sensor on ATmega328 + RF24 + BMP280.
+
+## Features
+
+1. Power consumption in sleep mode approximately 5 μA. Up to 3 years of operation on one CR2450 battery (estimated).
+2. Transmits battery level charge, temperature and air pressure every 5 min (can be changed up to 65535 seconds).
+3. Automatic restart in case of a hang-up.
+
+## Note
+
+A gateway is required. For details see "RF - ESP-NOW Gateway".
+
+## Full config example for Home Assistant
+
+```yml
+mqtt:
+  sensor:
+    - name: "NAME"
+      device_class: "voltage"
+      unit_of_measurement: "V"
+      state_topic: "homeassistant/rf_sensor/ID/bmp280"
+      value_template: "{{ value_json.battery }}"
+      expire_after: 375
+      force_update: true
+      qos: 2
+    - name: "NAME"
+      device_class: "temperature"
+      unit_of_measurement: "°C"
+      state_topic: "homeassistant/rf_sensor/ID/bmp280"
+      value_template: "{{ value_json.temperature }}"
+      expire_after: 375
+      force_update: true
+      qos: 2
+    - name: "NAME"
+      evice_class: "pressure"
+      unit_of_measurement: "мм"
+      state_topic: "homeassistant/rf_sensor/ID/bmp280"
+      value_template: "{{ value_json.pressure }}"
+      expire_after: 375
+      force_update: true
+      qos: 2
+```

platformio.ini

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+[env:ATmega328]
+platform = atmelavr
+board = ATmega328
+board_build.mcu = atmega328
+board_build.f_cpu = 8000000L
+framework = arduino
+upload_protocol = usbasp
+build_flags = 
+	-D portUSE_WDTO=WDTO_1S
+	-D BMP280=2
+	-D ID=$UNIX_TIME
+board_fuses.hfuse = 0xDE
+board_fuses.lfuse = 0xE2
+board_fuses.efuse = 0x07
+upload_flags = 
+	-Pusb
+	-e
+lib_deps = 
+	adafruit/Adafruit BMP280 Library@^2.6.6
+	feilipu/FreeRTOS@^10.5.0-0
+	nrf24/RF24@^1.4.5
+
+[env:ATmega328P]
+platform = atmelavr
+board = ATmega328P
+board_build.mcu = atmega328p
+board_build.f_cpu = 8000000L
+framework = arduino
+upload_protocol = usbasp
+build_flags = 
+	-D portUSE_WDTO=WDTO_1S
+	-D BMP280=2
+	-D ID=$UNIX_TIME
+board_fuses.hfuse = 0xDE
+board_fuses.lfuse = 0xE2
+board_fuses.efuse = 0x07
+upload_flags = 
+	-Pusb
+	-e
+lib_deps = 
+	adafruit/Adafruit BMP280 Library@^2.6.6
+	feilipu/FreeRTOS@^10.5.0-0
+	nrf24/RF24@^1.4.5
+
+[env:ATmega328PB]
+platform = atmelavr
+board = ATmega328PB
+board_build.mcu = atmega328pb
+board_build.f_cpu = 8000000L
+framework = arduino
+upload_protocol = usbasp
+build_flags = 
+	-D portUSE_WDTO=WDTO_1S
+	-D BMP280=2
+	-D ID=$UNIX_TIME
+board_fuses.hfuse = 0xDE
+board_fuses.lfuse = 0xE2
+board_fuses.efuse = 0x07
+upload_flags = 
+	-Pusb
+	-e
+lib_deps = 
+	adafruit/Adafruit BMP280 Library@^2.6.6
+	feilipu/FreeRTOS@^10.5.0-0
+	nrf24/RF24@^1.4.5

src/main.cpp

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+#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;
+}