preliminary UART setup for CO2 sensor

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/c31898adf5a8ed202ce5bea9f347b1c6871f32d1?narHash=sha256-yumd4fBc/hi8a9QgA9IT8vlQuLZ2oqhkJXHPKxH/tRw%3D' (2024-10-06)
  → 'github:nixos/nixpkgs/3016b4b15d13f3089db8a41ef937b13a9e33a8df?narHash=sha256-P/SQmKDu06x8yv7i0s8bvnnuJYkxVGBWLWHaU%2Btt4YY%3D' (2025-06-30)

.idea/.gitignore

@@ -1,8 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml

.idea/misc.xml

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$/firmware">
-    <contentRoot DIR="$PROJECT_DIR$" />
-  </component>
-  <component name="CidrRootsConfiguration">
-    <sourceRoots>
-      <file path="$PROJECT_DIR$/firmware/src" />
-      <file path="$PROJECT_DIR$/src" />
-    </sourceRoots>
-  </component>
-</project>

.idea/modules.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/untitled.iml" filepath="$PROJECT_DIR$/.idea/untitled.iml" />
-    </modules>
-  </component>
-</project>

.idea/untitled.iml

@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CMake" type="CPP_MODULE" version="4" />

.idea/vcs.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>

.vscode/settings.json

@@ -1,3 +1,3 @@
 {
-    "cmake.sourceDirectory": "/home/clara/repositorys/climate-go/firmware"
+    "git.ignoreLimitWarning": true
 }

firmware/.cargo/config.toml

@@ -0,0 +1,16 @@
+[build]
+target = "xtensa-esp32-espidf"
+
+[target.xtensa-esp32-espidf]
+linker = "ldproxy"
+runner = "espflash flash --monitor"
+rustflags = [ "--cfg",  "espidf_time64"]
+
+[unstable]
+build-std = ["std", "panic_abort"]
+
+[env]
+MCU="esp32"
+# Note: this variable is not used by the pio builder (`cargo build --features pio`)
+ESP_IDF_VERSION = "v5.2.3"
+

firmware/.gitignore

@@ -1,5 +1,4 @@
-.pio
+/.vscode
-.vscode/.browse.c_cpp.db*
+/.embuild
-.vscode/c_cpp_properties.json
+/target
-.vscode/launch.json
+/Cargo.lock
-.vscode/ipch

firmware/.idea/.gitignore

@@ -1,8 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml

firmware/.idea/firmware.iml

@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CMake" type="CPP_MODULE" version="4" />

firmware/.idea/misc.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
-  <component name="CidrRootsConfiguration">
-    <sourceRoots>
-      <file path="$PROJECT_DIR$/src" />
-    </sourceRoots>
-  </component>
-</project>

firmware/.idea/modules.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/firmware.iml" filepath="$PROJECT_DIR$/.idea/firmware.iml" />
-    </modules>
-  </component>
-</project>

firmware/.idea/vcs.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
-  </component>
-</project>

firmware/.vscode/extensions.json

@@ -1,10 +0,0 @@
-{
-    // See http://go.microsoft.com/fwlink/?LinkId=827846
-    // for the documentation about the extensions.json format
-    "recommendations": [
-        "platformio.platformio-ide"
-    ],
-    "unwantedRecommendations": [
-        "ms-vscode.cpptools-extension-pack"
-    ]
-}

firmware/CMakeLists.txt

@@ -1,33 +0,0 @@
-# !!! WARNING !!! AUTO-GENERATED FILE, PLEASE DO NOT MODIFY IT AND USE
-# https://docs.platformio.org/page/projectconf/section_env_build.html#build-flags
-#
-# If you need to override existing CMake configuration or add extra,
-# please create `CMakeListsUser.txt` in the root of project.
-# The `CMakeListsUser.txt` will not be overwritten by PlatformIO.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_SYSTEM_NAME Generic)
-set(CMAKE_C_COMPILER_WORKS 1)
-set(CMAKE_CXX_COMPILER_WORKS 1)
-
-project("firmware" C CXX)
-
-include(CMakeListsPrivate.txt)
-
-if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/CMakeListsUser.txt)
-include(CMakeListsUser.txt)
-endif()
-
-add_custom_target(
-    Production ALL
-    COMMAND platformio -c clion run "$<$<NOT:$<CONFIG:All>>:-e${CMAKE_BUILD_TYPE}>"
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-)
-
-add_custom_target(
-    Debug ALL
-    COMMAND platformio -c clion debug "$<$<NOT:$<CONFIG:All>>:-e${CMAKE_BUILD_TYPE}>"
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-)
-
-add_executable(Z_DUMMY_TARGET ${SRC_LIST})

firmware/Cargo.toml

@@ -0,0 +1,51 @@
+[package]
+name = "firmware"
+version = "0.1.0"
+authors = ["Clara Dautermann <git@cdaut.de>"]
+edition = "2021"
+resolver = "2"
+rust-version = "1.77"
+
+[[bin]]
+name = "firmware"
+harness = false # do not use the built in cargo test harness -> resolve rust-analyzer errors
+
+[profile.release]
+opt-level = "s"
+
+[profile.dev]
+debug = true    # Symbols are nice and they don't increase the size on Flash
+opt-level = "z"
+
+[features]
+default = []
+
+experimental = ["esp-idf-svc/experimental"]
+
+[dependencies]
+log = "0.4"
+esp-idf-svc = "0.51"
+bme280 = "0.5.1"
+esp-idf-hal = "0.45.2" 
+esp-idf-sys = { version = "0.36.1", features = ["binstart"] }
+mh-z19 = "0.3.3"
+
+# --- Optional Embassy Integration ---
+# esp-idf-svc = { version = "0.51", features = ["critical-section", "embassy-time-driver", "embassy-sync"] }
+
+# If you enable embassy-time-driver, you MUST also add one of:
+
+# a) Standalone Embassy libs ( embassy-time, embassy-sync etc) with a foreign async runtime:
+# embassy-time = { version = "0.4.0", features = ["generic-queue-8"] } # NOTE: any generic-queue variant will work
+
+# b) With embassy-executor:
+# embassy-executor = { version = "0.7", features = ["executor-thread", "arch-std"] }
+
+# NOTE: if you use embassy-time with embassy-executor you don't need the generic-queue-8 feature
+
+# --- Temporary workaround for embassy-executor < 0.8 ---
+# esp-idf-svc = { version = "0.51", features = ["embassy-time-driver", "embassy-sync"] }
+# critical-section = { version = "1.1", features = ["std"], default-features = false }
+
+[build-dependencies]
+embuild = "0.33"

firmware/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    embuild::espidf::sysenv::output();
+}

firmware/include/README

@@ -1,39 +0,0 @@
-
-This directory is intended for project header files.
-
-A header file is a file containing C declarations and macro definitions
-to be shared between several project source files. You request the use of a
-header file in your project source file (C, C++, etc) located in `src` folder
-by including it, with the C preprocessing directive `#include'.
-
-```src/main.c
-
-#include "header.h"
-
-int main (void)
-{
- ...
-}
-```
-
-Including a header file produces the same results as copying the header file
-into each source file that needs it. Such copying would be time-consuming
-and error-prone. With a header file, the related declarations appear
-in only one place. If they need to be changed, they can be changed in one
-place, and programs that include the header file will automatically use the
-new version when next recompiled. The header file eliminates the labor of
-finding and changing all the copies as well as the risk that a failure to
-find one copy will result in inconsistencies within a program.
-
-In C, the usual convention is to give header files names that end with `.h'.
-It is most portable to use only letters, digits, dashes, and underscores in
-header file names, and at most one dot.
-
-Read more about using header files in official GCC documentation:
-
-* Include Syntax
-* Include Operation
-* Once-Only Headers
-* Computed Includes
-
-https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

firmware/lib/README

@@ -1,46 +0,0 @@
-
-This directory is intended for project specific (private) libraries.
-PlatformIO will compile them to static libraries and link into executable file.
-
-The source code of each library should be placed in a an own separate directory
-("lib/your_library_name/[here are source files]").
-
-For example, see a structure of the following two libraries `Foo` and `Bar`:
-
-|--lib
-|  |
-|  |--Bar
-|  |  |--docs
-|  |  |--examples
-|  |  |--src
-|  |     |- Bar.c
-|  |     |- Bar.h
-|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
-|  |
-|  |--Foo
-|  |  |- Foo.c
-|  |  |- Foo.h
-|  |
-|  |- README --> THIS FILE
-|
-|- platformio.ini
-|--src
-   |- main.c
-
-and a contents of `src/main.c`:
-```
-#include <Foo.h>
-#include <Bar.h>
-
-int main (void)
-{
-  ...
-}
-
-```
-
-PlatformIO Library Dependency Finder will find automatically dependent
-libraries scanning project source files.
-
-More information about PlatformIO Library Dependency Finder
-- https://docs.platformio.org/page/librarymanager/ldf.html

firmware/platformio.ini

@@ -1,15 +0,0 @@
-; PlatformIO Project Configuration File
-;
-;   Build options: build flags, source filter
-;   Upload options: custom upload port, speed and extra flags
-;   Library options: dependencies, extra library storages
-;   Advanced options: extra scripting
-;
-; Please visit documentation for the other options and examples
-; https://docs.platformio.org/page/projectconf.html
-
-[env:esp32dev]
-platform = espressif32
-board = esp32dev
-framework = arduino
-lib_deps = adafruit/Adafruit BMP280 Library@^2.6.1

firmware/rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "esp"

firmware/sdkconfig.defaults

@@ -0,0 +1,10 @@
+# Rust often needs a bit of an extra main task stack size compared to C (the default is 3K)
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8000
+
+# Use this to set FreeRTOS kernel tick frequency to 1000 Hz (100 Hz by default).
+# This allows to use 1 ms granularity for thread sleeps (10 ms by default).
+#CONFIG_FREERTOS_HZ=1000
+
+# Workaround for https://github.com/espressif/esp-idf/issues/7631
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=n
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_FULL=n

firmware/src/ble/BluetoothServer.cpp

@@ -1,92 +0,0 @@
-#include <BLEDevice.h>
-#include <BLEServer.h>
-#include <BLE2902.h>
-#include "BluetoothServer.h"
-
-#define INTERNAL_LED_PIN 2
-#define BLE_SERVER_NAME "ClimateGO"
-#define SERVICE_UUID "2150123c-af53-4038-bc92-ba3d0870a9e4"
-#define TEMPERATURE_CHARACTERISTIC_UUID "cba1d466-344c-4be3-ab3f-189f80dd7518"
-#define PRESSURE_CHARACTERISTIC_UUID "ca73b3ba-39f6-4ab3-91ae-186dc9577d99"
-
-//Setup callbacks onConnect and onDisconnect
-class ServerCallbacks : public BLEServerCallbacks {
-    void onConnect(BLEServer *pServer) override {
-        Serial.println("New device connected.");
-        digitalWrite(INTERNAL_LED_PIN, HIGH);
-    };
-
-    void onDisconnect(BLEServer *pServer) override {
-        Serial.println("Device disconnected.");
-        digitalWrite(INTERNAL_LED_PIN, LOW);
-        //restart advertising on device disconnect
-        pServer->getAdvertising()->start();
-    }
-};
-
-/**
- * Represents the Bluetooth server that handles all interactions
- */
-BluetoothServer::BluetoothServer() {
-    // Create the BLE Device
-    BLEDevice::init(BLE_SERVER_NAME);
-
-    // Create the BLE Server
-    this->bleServer = BLEDevice::createServer();
-    bleServer->setCallbacks(new ServerCallbacks());
-
-    // Create the BLE Service
-    this->sensorService = bleServer->createService(SERVICE_UUID);
-
-    //create characteristics that will enable data sharing
-    BLECharacteristic *temperatureCharacteristic = sensorService->createCharacteristic(
-            TEMPERATURE_CHARACTERISTIC_UUID,
-            BLECharacteristic::PROPERTY_READ
-    );
-    BLECharacteristic *pressureCharacteristic = sensorService->createCharacteristic(
-            PRESSURE_CHARACTERISTIC_UUID,
-            BLECharacteristic::PROPERTY_READ
-    );
-
-    //set initial values
-    temperatureCharacteristic->setValue("NA");
-    pressureCharacteristic->setValue("NA");
-}
-
-/**
- * Method to start the Bluetooth server and enable advertising to allow other devices to connect
- */
-void BluetoothServer::startServer() {
-    // Start the service
-    this->sensorService->start();
-
-    // Start advertising
-    BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
-    pAdvertising->addServiceUUID(SERVICE_UUID);
-    this->bleServer->getAdvertising()->start();
-    Serial.println("Started BLE Server.");
-}
-
-/**
- * TODO: Convert temperature to string somehow
- * Publish a new temperature to the appropriate characteristic
- * @param temperature the new temperature
- */
-void BluetoothServer::setTemperature(float temperature) {
-    sensorService
-            ->getCharacteristic(TEMPERATURE_CHARACTERISTIC_UUID)
-            ->setValue(temperature);
-}
-
-/**
- * TODO: Convert pressure to string somehow
- * Publish a new pressure to the appropriate characteristic
- * @param pressure the new pressure
- */
-void BluetoothServer::setPressure(float pressure) {
-    sensorService
-            ->getCharacteristic(PRESSURE_CHARACTERISTIC_UUID)
-            ->setValue(pressure);
-}
-
-

firmware/src/ble/BluetoothServer.h

@@ -1,25 +0,0 @@
-#ifndef NEW_CLIMTE_GO_BLUETOOTHSERVER_H
-#define NEW_CLIMTE_GO_BLUETOOTHSERVER_H
-
-#include <BLEDevice.h>
-#include <BLEServer.h>
-#include <BLEUtils.h>
-#include <BLE2902.h>
-#include <Arduino.h>
-
-#define temperatureCelsius
-
-class BluetoothServer {
-private:
-    BLEService *sensorService;
-    BLEServer *bleServer;
-public:
-    BluetoothServer();
-
-    void startServer();
-    void setTemperature(float temperature);
-    void setPressure(float pressure);
-};
-
-
-#endif //NEW_CLIMTE_GO_BLUETOOTHSERVER_H

firmware/src/main.cpp

@@ -1,28 +0,0 @@
-#include <Arduino.h>
-#include <sensors/BmpSensor.h>
-#include <ble/BluetoothServer.h>
-
-#define SLEEP_TIME 2
-#define BAUD_RATE 112500
-#define INTERNAL_LED_PIN 2
-
-
-Sensor *bmpSensor;
-BluetoothServer *server;
-
-void setup() {
-    Serial.begin(BAUD_RATE);
-    pinMode(INTERNAL_LED_PIN, OUTPUT);
-
-    bmpSensor = new BmpSensor();
-
-    server = new BluetoothServer();
-    server->startServer();
-}
-
-void loop() {
-    sensor_data_t sample = ((BmpSensor *) bmpSensor)->sampleLowEnergy();
-    server->setPressure(sample.pressure);
-    server->setTemperature(sample.temperature);
-    delay(SLEEP_TIME * 1000);
-}

firmware/src/main.rs

@@ -0,0 +1,155 @@
+use bme280::{i2c::BME280, Error};
+use esp_idf_hal::{
+    adc::{
+        attenuation,
+        oneshot::{config::AdcChannelConfig, AdcChannelDriver, AdcDriver},
+        ADC2,
+    },
+    delay::Delay,
+    gpio,
+    i2c::{I2cConfig, I2cDriver, I2cError},
+    prelude::Peripherals,
+    uart::{config, UartDriver},
+    units::Hertz,
+};
+
+struct InitResult<'s, I2C> {
+    bme280: BME280<I2C>,
+    no2_adc: AdcChannelDriver<'s, esp_idf_hal::gpio::Gpio4, AdcDriver<'s, ADC2>>,
+}
+
+fn main() {
+    let mut peripherals = init();
+
+    loop {
+        let measurement = peripherals
+            .bme280
+            .measure(&mut Delay::new_default())
+            .unwrap();
+
+        println!(
+            "temperature:{0}°C, pressure:{1}",
+            measurement.temperature, measurement.pressure
+        );
+
+        match peripherals.no2_adc.read() {
+            Ok(v) => {
+                println!("NO2 ADC voltage: {v}");
+            }
+            Err(err) => log::error!("Failed to read ADC for NO2 value with error {err}"),
+        };
+
+        Delay::default().delay_ms(1000);
+    }
+}
+
+fn init<'a>() -> InitResult<'a, I2cDriver<'a>> {
+    //set up logger
+    esp_idf_sys::link_patches(); // Important!
+    esp_idf_svc::log::EspLogger::initialize_default();
+    log::info!("Meow :3");
+
+    // Initialize peripherals
+    let peripherals = Peripherals::take().unwrap();
+
+    // Define SCL and SDA pins
+    let sda = peripherals.pins.gpio21;
+    let scl = peripherals.pins.gpio22;
+
+    // Create I2C config
+    let config = I2cConfig::new().baudrate(100000.into());
+
+    log::info!("Initializing I2C bus…");
+
+    // Initialize I2C driver
+    let i2c_bus = match I2cDriver::new(
+        peripherals.i2c0, // or i2c1/i2c2 based on board
+        sda,
+        scl,
+        &config,
+    ) {
+        Ok(i2c_connection) => i2c_connection,
+        Err(err) => {
+            log::error!("Initializing I2C connection failed with {err}!");
+            panic!()
+        }
+    };
+
+    log::info!("I2C up!");
+    log::info!("Initializing bme280…");
+
+    let mut bme280 = BME280::new_primary(i2c_bus);
+
+    //initialize Sensor
+    match bme280.init(&mut Delay::new(100000)) {
+        Ok(_) => {}
+        Err(err) => {
+            log::error!("Error initializing bme280 sensor:");
+            handle_i2c_error(err);
+        }
+    }
+    log::info!("BME280 up!");
+
+    //initialize adc2 for MICS2714
+    let adc2 = match AdcDriver::new(peripherals.adc2) {
+        Ok(driver) => driver,
+        Err(err) => {
+            log::error!("Failed to initialize AdcDriver with error {err}");
+            panic!()
+        }
+    };
+
+    log::info!("Initializing ADC2 on GPIO4 for NO2 sensor…");
+
+    // Define channel config with desired attenuation
+    let mut channel_config = AdcChannelConfig::new();
+    channel_config.attenuation = attenuation::DB_11;
+
+    let adc_channel_driver: AdcChannelDriver<'a, esp_idf_hal::gpio::Gpio4, AdcDriver<'_, ADC2>> =
+        match AdcChannelDriver::new(adc2, peripherals.pins.gpio4, &channel_config) {
+            Ok(channel) => channel,
+            Err(err) => {
+                log::error!("Failed to initialize AdcChannelDriver with error {err}");
+                panic!()
+            }
+        };
+
+    log::info!("ADC2  channel driver@GPIO4 initialized!");
+
+    //set up mh-Z19B CO2 sensor
+    let tx_pin = peripherals.pins.gpio5;
+    let rx_pin = peripherals.pins.gpio6;
+
+    //obtain UART connection
+    let uart_config = config::Config::new().baudrate(Hertz(115_200));
+    let uart = match UartDriver::new(
+        peripherals.uart1,
+        tx_pin,
+        rx_pin,
+        Option::<gpio::AnyIOPin>::None,
+        Option::<gpio::AnyIOPin>::None,
+        &uart_config,
+    ) {
+        Ok(uart_drv) => uart_drv,
+        Err(error) => {
+            log::error!("Error initializing UART connection: {error}.");
+            panic!();
+        }
+    };
+
+    InitResult {
+        bme280: bme280,
+        no2_adc: adc_channel_driver,
+    }
+}
+
+fn handle_i2c_error(error: Error<I2cError>) {
+    match error {
+                bme280::Error::CompensationFailed => log::error!("Failed to compensate a raw measurement"),
+                bme280::Error::Bus(buserr) => log::error!("Bus error: {}", buserr),
+                bme280::Error::InvalidData => log::error!("Failed to pare sensor data!"),
+                bme280::Error::NoCalibrationData => log::error!("No calibration data is available (probably forgot to call or check BME280::init for failure)"),
+                bme280::Error::UnsupportedChip =>  log::error!("Chip ID doesn't match expected value"),
+                bme280::Error::Delay => log::error!("Delay error"),
+            }
+}

firmware/src/sensors/BmpSensor.cpp

@@ -1,89 +0,0 @@
-#include <Arduino.h>
-#include <Wire.h>
-#include <Adafruit_BMP280.h>
-#include "BmpSensor.h"
-
-/**
- * Creates a new BMP Sensor and initializes it
- */
-BmpSensor::BmpSensor() {
-    this->BmpSensor::sensor_setup();
-    this->state = SensorState::ASLEEP;
-}
-
-/**
- * Function responsible for setting up the sensor and the I2C connection
- */
-void BmpSensor::sensor_setup() {
-    while (!Serial) delay(100);   // wait for native usb
-
-    unsigned status = this->bmp.begin(0x76); //set the correct I2C port
-
-    //query status and reboot the board if no sensor is detected
-    if (!status)
-        ESP.restart();
-
-    //put sensor to standby mode
-    this->enableStandbyMode();
-}
-
-/**
- * Function to wake sensor up from standby mode
- */
-void BmpSensor::wakeUp() {
-    this->bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
-                          Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
-                          Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
-                          Adafruit_BMP280::FILTER_X16,      /* Filtering. */
-                          Adafruit_BMP280::STANDBY_MS_500 /* Standby time. */
-    );
-}
-
-/**
- * Function to put sensor to standby mode
- */
-void BmpSensor::enableStandbyMode() {
-    this->bmp.setSampling(Adafruit_BMP280::MODE_SLEEP,     /* Operating Mode. */
-                          Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
-                          Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
-                          Adafruit_BMP280::FILTER_X16,      /* Filtering. */
-                          Adafruit_BMP280::STANDBY_MS_500 /* Standby time. */
-    );
-}
-
-/**
- * read a sample from the sensor
- * @return a struct containing all necessary sensor data
- */
-sensor_data_t BmpSensor::sample() {
-    //wake sensor up if it is in standby mode
-    if (this->state == SensorState::ASLEEP)
-        this->wakeUp();
-
-    //sample pressure and temperature
-    sensors_event_t temp_event, pressure_event;
-    this->bmp_temp->getEvent(&temp_event);
-    this->bmp_pressure->getEvent(&pressure_event);
-
-
-    return sensor_data_t
-            {
-                    temp_event.temperature,
-                    pressure_event.pressure
-            };
-}
-
-/**
- * Read a sample and put sensor to standby mode.
- * !!! Do not use this if sampling time is <= 500ms !!!
- * @return the sample read
- */
-sensor_data_t BmpSensor::sampleLowEnergy() {
-    //read sample
-    sensor_data_t sampledData = this->sample();
-    //put sensor to standby
-    this->enableStandbyMode();
-    return sampledData;
-}
-
-

firmware/src/sensors/BmpSensor.h

@@ -1,29 +0,0 @@
-#ifndef NEW_CLIMTE_GO_BMPSENSOR_H
-#define NEW_CLIMTE_GO_BMPSENSOR_H
-
-#include "Sensor.h"
-#include "Adafruit_BMP280.h"
-
-class BmpSensor : public Sensor {
-private:
-    Adafruit_BMP280 bmp; // use I2C interface
-    Adafruit_Sensor *bmp_temp = bmp.getTemperatureSensor();
-    Adafruit_Sensor *bmp_pressure = bmp.getPressureSensor();
-
-public:
-    BmpSensor();
-
-    sensor_data_t sample() override;
-    sensor_data_t sampleLowEnergy();
-
-    void enableStandbyMode() override;
-
-    void wakeUp() override;
-
-protected:
-    void sensor_setup() override;
-
-};
-
-#endif //NEW_CLIMTE_GO_BMPSENSOR_H
-

firmware/src/sensors/Sensor.h

@@ -1,25 +0,0 @@
-#ifndef NEW_CLIMTE_GO_SENSOR_H
-#define NEW_CLIMTE_GO_SENSOR_H
-
-#include <sensors/sensor_data_t.h>
-
-enum class SensorState : unsigned short {
-    AWAKE, ASLEEP
-};
-
-class Sensor {
-public:
-    virtual sensor_data_t sample() = 0;
-
-    virtual void wakeUp() = 0;
-
-    virtual void enableStandbyMode() = 0;
-
-protected:
-    SensorState state = SensorState::ASLEEP;
-
-    virtual void sensor_setup() = 0;
-
-};
-
-#endif //NEW_CLIMTE_GO_SENSOR_H

firmware/src/sensors/sensor_data_t.h

@@ -1,16 +0,0 @@
-#ifndef NEW_CLIMTE_GO_SENSOR_DATA_T_H
-#define NEW_CLIMTE_GO_SENSOR_DATA_T_H
-
-#include <types.h>
-
-/**
- * This struct represents data read from any sensor.
- * This implies, reading temperature from e.g. the CO2 Sensor
- * does not make any sense
- */
-struct sensor_data_t {
-    float temperature;
-    float pressure;
-};
-
-#endif

firmware/test/README

@@ -1,11 +0,0 @@
-
-This directory is intended for PlatformIO Unit Testing and project tests.
-
-Unit Testing is a software testing method by which individual units of
-source code, sets of one or more MCU program modules together with associated
-control data, usage procedures, and operating procedures, are tested to
-determine whether they are fit for use. Unit testing finds problems early
-in the development cycle.
-
-More information about PlatformIO Unit Testing:
-- https://docs.platformio.org/page/plus/unit-testing.html

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1728241625,
+        "lastModified": 1751271578,
-        "narHash": "sha256-yumd4fBc/hi8a9QgA9IT8vlQuLZ2oqhkJXHPKxH/tRw=",
+        "narHash": "sha256-P/SQmKDu06x8yv7i0s8bvnnuJYkxVGBWLWHaU+tt4YY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "c31898adf5a8ed202ce5bea9f347b1c6871f32d1",
+        "rev": "3016b4b15d13f3089db8a41ef937b13a9e33a8df",
         "type": "github"
       },
       "original": {

flake.nix

@@ -1,25 +1,66 @@
 {
-  description = "A Nix-flake-based PlatformIO development environment";
+  description = "A Nix-flake-based Rust ESP IDF development environment";
 
   inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
   outputs = { self, nixpkgs }:
     let
       supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+
-        pkgs = import nixpkgs { inherit system; };
+      nixpkgs-esp-dev = builtins.fetchGit {
-      });
+        url = "https://github.com/mirrexagon/nixpkgs-esp-dev.git";
+
+        # Optionally pin to a specific commit of `nixpkgs-esp-dev`.
+        rev = "f37890edc9b327fcbc6d48c4cf174e65e4c0d148";
+      };
+
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system:
+        let
+          pkgs = import nixpkgs { inherit system; overlays = [ (import "${nixpkgs-esp-dev}/overlay.nix") ]; };
+
+          libxml2Shared = pkgs.libxml2.overrideAttrs (old: {
+            configureFlags = (old.configureFlags or [ ]) ++ [ "--enable-shared" ];
+
+            # cursed patch necessary to fix linking errors
+            postInstall = ''
+              ln -sf libxml2.so $out/lib/libxml2.so.2
+              ${old.postInstall or ""}
+            '';
+          });
+        in
+        f { inherit pkgs libxml2Shared; }
+      );
+
     in
     {
-      devShells = forEachSupportedSystem ({ pkgs }: {
+      devShells = forEachSupportedSystem
-        default = pkgs.mkShell {
+        ({ pkgs, libxml2Shared }: {
-          packages = with pkgs; [
+          default = pkgs.mkShell
-            platformio-core
+            {
-            openocd
+              packages = with pkgs; [
-            python3
+                esp-idf-full
-            platformio
+                espflash
-          ];
+                cargo-espflash
-        };
+                espup
-      });
+
+                llvmPackages_16.libclang # Explicitly add libclang
+                llvmPackages_16.clang # Include clang/headers
+                pkg-config # Often needed for bindgen to find clang
+                glibc.dev # Needed for C headers
+                libxml2Shared.out
+                ldproxy
+              ];
+
+              env = {
+                # Set LD_LIBRARY_PATH so libstdc++.so.6 zlib and libxml2 can be found
+                LD_LIBRARY_PATH = with pkgs; pkgs.lib.makeLibraryPath [
+                  gcc.cc.lib
+                  zlib
+                  libxml2Shared.out
+                ];
+              };
+            };
+        });
     };
 }
+