# Arduino

* #sudo dnf install python3-pyserial
* #sudo chmod a+rw /dev/ttyUSB0 
* #sudo usermod -a -G dialout <username>

* download the binary from arduino
  * https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_Linux_64bit.tar.gz
  * Put the binary in your path (~/.local/bin)

```
arduino-cli config init
arduino-cli config set board_manager.additional_urls "https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json"
arduino-cli config set library.enable_unsafe_install true

arduino-cli core update-index
arduino-cli core install esp32:esp32

# Optional libraries
arduino-cli lib install "ESP8266 Influxdb" # send tcp data packets to influx/grafana
arduino-cli lib install "PID" # Reference PID controller for arduino
arduino-cli lib install "Adafruit BME280 Library" # Temp/Press/Humidity sensor
arduino-cli lib install "DallasTemperature" # Temperature sensor
arduino-cli lib install "HX711 Arduino Library" # Load cell library to make scales
```

## To make a new project
Arduino is a bit bojank. The directory structure is tied to the .arduino directory created with the config created above. The files must be stored with the following names: 
* project name `sketch-name`
* path must be `~/Arduino/sketch-name/sketch-name.ino`
* main script must be named `sketch-name.ino`
This directory structure is required for `compile` and `upload` below. To set up the directories automatically use `arduino-cli sketch new blink`

``` ~/Ardruino/blink/blink.ino
const int LED_BUILTIN = 2;
void setup() {
    pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN, LOW);
    delay(1000);
}
```

## Complile the project

```
arduino-cli compile -b esp32:esp32:esp32 ~/Arduino/blink
```

## Upload to the device

```
arduino-cli upload -p /dev/ttyUSB0 -b esp32:esp32:esp32 ~/Arduino/blink
```