Nareshkumar Rao
7 months ago
7 changed files with 309 additions and 67 deletions
@ -1,13 +1,85 @@ |
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pub const LOGIC_LEVEL: f32 = 3.3; |
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pub const THERMISTOR_ANALOG_PIN: u8 = 0; |
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pub const THERMISTOR_VOLTAGE_DIVIDER_RESISTANCE: f32 = 9_700.; |
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pub const LIGHT_RELAY_PIN: u8 = 0; |
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pub const FAN_RELAY_PIN: u8 = 1; |
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pub const WATER_PUMP_RELAY_PIN: u8 = 2; |
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pub const RELAY_GPIO_PINS: [Option<u8>; 4] = [Some(17), Some(27), Some(22), None]; |
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pub const SOIL_MOISTURE_PIN: u8 = 1; |
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pub const SOIL_MOISTURE_100_VOLTAGE: f32 = 1.417; |
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pub const SOIL_NOMINAL_MOISTURE: f32 = 0.41; |
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pub const SOIL_NOMINAL_MOISTURE_VOLTAGE: f32 = 2.823; |
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use serde::{Deserialize, Serialize}; |
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use crate::error::GenericResult; |
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#[derive(Serialize, Deserialize)] |
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pub struct RelaySettings { |
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pub light_pin: u8, |
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pub fan_pin: u8, |
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pub water_pump_pin: u8, |
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pub relay_gpio_pins: Vec<Option<u8>>, |
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} |
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#[derive(Serialize, Deserialize)] |
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pub struct ThermistorSettings { |
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pub pin: u8, |
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pub voltage_divider_resistance: f32, |
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pub nominal_resistance: f32, |
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pub nominal_temperature: f32, |
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pub thermal_constant: f32, |
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} |
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#[derive(Serialize, Deserialize)] |
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pub struct SoilMoistureSettings { |
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pub pin: u8, |
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pub voltage_100: f32, |
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pub voltage_nominal: f32, |
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pub moisture_nominal: f32, |
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} |
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#[derive(Serialize, Deserialize)] |
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pub struct BoardSettings { |
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pub logic_level: f32, |
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} |
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#[derive(Serialize, Deserialize)] |
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pub struct Configuration { |
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pub board_settings: BoardSettings, |
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pub relay_settings: RelaySettings, |
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pub soil_moisture_settings: SoilMoistureSettings, |
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pub thermistor_settings: ThermistorSettings, |
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} |
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impl Configuration { |
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fn from_file(path: &std::path::Path) -> GenericResult<Configuration> { |
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let text = std::fs::read_to_string(path)?; |
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let config: Configuration = toml::from_str(text.as_str())?; |
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Ok(config) |
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} |
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fn save_to_file(path: &std::path::Path, config: &Configuration) -> GenericResult<()> { |
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let text = toml::to_string_pretty(config)?; |
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std::fs::write(path, text)?; |
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Ok(()) |
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} |
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} |
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const THERMISTOR_NOMINAL_RESISTANCE: f32 = 10_000.; |
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const THERMISTOR_NOMINAL_TEMPERATURE: f32 = 298.15; |
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const THERMISTOR_CONSTANT: f32 = 3950.; |
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impl Default for Configuration { |
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fn default() -> Self { |
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Self { |
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board_settings: BoardSettings { logic_level: 3.3 }, |
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relay_settings: RelaySettings { |
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light_pin: 0, |
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fan_pin: 1, |
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water_pump_pin: 2, |
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relay_gpio_pins: [Some(17), Some(27), Some(22), None].to_vec(), |
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}, |
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soil_moisture_settings: SoilMoistureSettings { |
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pin: 1, |
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voltage_100: 1.417, |
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voltage_nominal: 2.823, |
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moisture_nominal: 0.41, |
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}, |
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thermistor_settings: ThermistorSettings { |
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pin: 0, |
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voltage_divider_resistance: 9_700., |
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nominal_resistance: 10_000., |
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nominal_temperature: 298.15, |
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thermal_constant: 3950., |
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}, |
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} |
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} |
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} |
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@ -1,27 +1,26 @@ |
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use crate::{config::*, error::GenericResult, io::get_input_voltage}; |
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pub fn get_temperature() -> GenericResult<f32> { |
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const THERMISTOR_NOMINAL_RESISTANCE: f32 = 10_000.; |
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const THERMISTOR_NOMINAL_TEMPERATURE: f32 = 298.15; |
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const THERMISTOR_CONSTANT: f32 = 3950.; |
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let voltage = get_input_voltage(THERMISTOR_ANALOG_PIN)?; |
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let resistance = (LOGIC_LEVEL / voltage - 1.) * THERMISTOR_VOLTAGE_DIVIDER_RESISTANCE; |
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pub fn get_temperature(config: &Configuration) -> GenericResult<f32> { |
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let voltage = get_input_voltage(config.thermistor_settings.pin)?; |
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let resistance = (config.board_settings.logic_level / voltage - 1.) |
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* config.thermistor_settings.voltage_divider_resistance; |
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let temperature = 1. |
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/ ((1. / THERMISTOR_NOMINAL_TEMPERATURE) |
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+ (1. / THERMISTOR_CONSTANT * f32::ln(resistance / THERMISTOR_NOMINAL_RESISTANCE))) |
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/ ((1. / config.thermistor_settings.nominal_temperature) |
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+ (1. / config.thermistor_settings.thermal_constant |
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* f32::ln(resistance / config.thermistor_settings.nominal_resistance))) |
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- 273.15; |
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Ok(temperature) |
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} |
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pub fn get_soil_moisture() -> GenericResult<f32> { |
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let voltage = get_input_voltage(SOIL_MOISTURE_PIN)?; |
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pub fn get_soil_moisture(config: &Configuration) -> GenericResult<f32> { |
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let voltage = get_input_voltage(config.soil_moisture_settings.pin)?; |
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const VOLTAGE_ZERO_HUMIDITY: f32 = (SOIL_NOMINAL_MOISTURE_VOLTAGE |
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- SOIL_MOISTURE_100_VOLTAGE * SOIL_NOMINAL_MOISTURE) |
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/ (1. - SOIL_NOMINAL_MOISTURE); |
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let voltage_zero_humidity: f32 = (config.soil_moisture_settings.voltage_nominal |
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- config.soil_moisture_settings.voltage_100 |
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* config.soil_moisture_settings.moisture_nominal) |
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/ (1. - config.soil_moisture_settings.moisture_nominal); |
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let humidity = |
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(voltage - VOLTAGE_ZERO_HUMIDITY) / (SOIL_MOISTURE_100_VOLTAGE - VOLTAGE_ZERO_HUMIDITY); |
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let humidity = (voltage - voltage_zero_humidity) |
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/ (config.soil_moisture_settings.voltage_100 - voltage_zero_humidity); |
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Ok(humidity) |
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} |
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