屋内環境を手軽にモニタリングする～④MH-Z19BからCO2濃度をJavaで取得する(シリアル通信 / jSerialComm)～

console=serial0,115200 --> 削除します。

@@ -45,7 +45,7 @@
 # Uncomment some or all of these to enable the optional hardware interfaces
 #dtparam=i2c_arm=on
 #dtparam=i2s=on
-#dtparam=spi=on
+dtparam=spi=on

 # Uncomment this to enable the lirc-rpi module
 #dtoverlay=lirc-rpi
@@ -55,6 +55,10 @@
 # Enable audio (loads snd_bcm2835)
 dtparam=audio=on

+enable_uart=1
+dtoverlay=pi3-miniuart-bt
+core_freq=250
+
 [pi4]
 # Enable DRM VC4 V3D driver on top of the dispmanx display stack
 dtoverlay=vc4-fkms-v3d

import io.github.s5uishida.iot.device.mhz19b.driver.MHZ19BDriver;

public class MyMHZ19B {
    private static final Logger LOG = LoggerFactory.getLogger(MyMHZ19B.class);

    public static void main(String[] args) throws IOException {
        MHZ19BDriver mhz19b = null;
        try {
            mhz19b = MHZ19BDriver.getInstance("/dev/ttyAMA0");
            mhz19b.open();
            mhz19b.setDetectionRange5000();

            while (true) {
                int value = mhz19b.getGasConcentration();
                LOG.info("co2:" + value);

                Thread.sleep(10000);
            }
        } catch (InterruptedException e) {
            LOG.warn("caught - {}", e.toString());
        } catch (IOException e) {
            LOG.warn("caught - {}", e.toString());
        } finally {
            if (mhz19b != null) {
                mhz19b.close();
            }
        }
    }
}