Carregando...

Raspberry Pi DHT-SwiftyGPIO

10 de March de 2019

Using Swift to display temperature and humidity of a DHT11 module

Requirements

Raspberry Pi 2+ or Raspberry Pi 3 Model B Model DHT11 or DHT22

Installing Dependencies

To use the provided prebuilt binaries you'll need the install the following dependencies:

 

 

sudo apt-get install clang libicu-dev libcurl4-nss-dev

 

 

Starting

SwiftyGPIO Download last version swift ARM compatible with your board.

See table: Build Swift On ARM prebuilt-binaries and Download

 

wget https://github.com/uraimo/buildSwiftOnARM/releases/download/4.2.3/swift-4.2.3-RPi23-RaspbianStretch.tgz

 

Unzip the files to a folder of your choice: For example: /home/michel/swift-4.2.3/ After unzip, export path:

 

export PATH=/home/michel/swift-4.2.3/usr/bin:"${PATH}" 

 

Test if everything went right run command:

 

swift --version 

 

And the output should be like this:

 

Swift version 4.2.3 (swift-4.2.3-RELEASE) Target: armv7-unknown-linux-gnueabihf

 

 

Clone and run project

 

$ git clone https://github.com/micheltlutz/DHT-SwiftyGPIO 
$ cd DHT-SwiftyGPIO
$ swift run  Waiting output should be like this: 
Temperatura: 25.0 Umidate: 41.0

 

Reference files

The DHT.swift was based on the project dhtxx But with modifications

DHT class init allows you to select the sensor type and data conversion by default is used Celcius

 

Enums Types

 

swift public enum SupportedSensor { 
    case dht11, dht22 
} 

public enum ConversionType { 
    case Fahrenheit, Celsius 
} 


init(pin: GPIO, for sensor: SupportedSensor, conversion: ConversionType = .Celsius) { } 

... 


Example create module DHT11 Object

 

let dht = DHT(pin: gpios[.P4]!, for: .dht11) 

 

Issues

 

Initial read errors occur due to initial pulse failure  Usually get a good reading within the past 60s.

See the project on Github DHT-SwiftyGPIO

 

 

I hope this project helps start with the creation of IoT projects with Swift

 

 

Desenvolvido por Michel Lütz