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libraries/M5UnitUnified/examples/Basic/ComponentOnly/main/ComponentOnly.cpp

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+/*
+ * SPDX-FileCopyrightText: 2024 M5Stack Technology CO LTD
+ *
+ * SPDX-License-Identifier: MIT
+ */
+/*
+  Example of using only unit component without UnitUnified manager
+  If you use other units, change include files(*1), instances(*2), and get values(*3)
+*/
+#include <M5Unified.h>
+#include <M5UnitUnified.h>
+#include <M5UnitUnifiedENV.h>  // *1 Include the header of the unit to be used
+
+m5::unit::UnitCO2 unit;  // *2 Instance of the unit
+
+void setup()
+{
+    M5.begin();
+
+    auto pin_num_sda = M5.getPin(m5::pin_name_t::port_a_sda);
+    auto pin_num_scl = M5.getPin(m5::pin_name_t::port_a_scl);
+    M5_LOGI("getPin: SDA:%u SCL:%u", pin_num_sda, pin_num_scl);
+    Wire.begin(pin_num_sda, pin_num_scl, 400 * 1000U);
+
+    M5.Display.clear(TFT_DARKGREEN);
+    if (!unit.assign(Wire)  // Assign Wire
+        || unit.begin()) {  // Begin unit
+        M5_LOGE("Failed to assign/begin");
+        M5.Display.clear(TFT_RED);
+    }
+}
+
+void loop()
+{
+    M5.update();
+    unit.update();  // Explicitly call unit.update() yourself
+    if (unit.updated()) {
+        // *3 Obtaining unit-specific measurements
+        M5_LOGI("CO2:%u Temp:%f Hum:%f", unit.co2(), unit.temperature(), unit.humidity());
+    }
+}