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CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(ENV{PICO_SDK_PATH} /home/rosia/Programming/Pico/pico-sdk)
+include_directories($ENV{PICO_SDK_PATH})
+include($ENV{PICO_SDK_PATH}/external/pico_sdk_import.cmake)
+
+project(plantSystem)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11)
+
+pico_sdk_init()
+
+add_executable(plantSystem main.cpp Pump.cpp)
+
+target_link_libraries(plantSystem pico_stdlib)
+
+pico_add_extra_outputs(plantSystem)

Pump.cpp

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+#include "Pump.h"
+
+Pump::Pump()
+{
+    // set up pins
+    gpio_init(pin);
+    gpio_set_dir(pin, GPIO_OUT);
+}
+
+void Pump::pumpMilliliters(int milliliters)
+{
+    gpio_put(pin, true);
+    sleep_ms(calculateTimeToPushMilliliters(milliliters)*1000);
+    gpio_put(pin, false);
+}
+
+int Pump::calculateTimeToPushMilliliters(int milliliters)
+{
+    return milliliters/millilitersPerSecond;
+}

Pump.h

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+#include "pico/stdlib.h"
+
+class Pump
+{
+private:
+    uint pin = 0;
+
+    int millilitersPerSecond = 30;
+
+    int calculateTimeToPushMilliliters(int milliliters);
+
+public:
+    Pump();
+
+    void pumpMilliliters(int milliliters);
+};

Sensor.cpp

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+#include "Sensor.h"
+
+float Sensor::readSensor()
+{
+    return 0; // TODO implement this
+}

main.cpp

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+#include "pico/stdlib.h"
+
+#include "Pump.h"
+
+int main()
+{
+    Pump* pump = new Pump();
+
+    while(true)
+    {
+        sleep_ms(20000);
+        pump->pumpMilliliters(100);
+    }
+
+    return 0;
+}
+float readSensor();