This section outlines how to configure HDC2x devices to operate in Auto Measurement Mode (AMM) and highlights key differences compared to Trigger-On Demand mode.

In AMM, the device automatically performs measurements at a user-defined sampling frequency, eliminating the need for manual measurement triggers from the MCU. Unlike Trigger-On Demand, where each measurement must be initiated manually, AMM requires only a single trigger to start periodic conversions.

In this example, the HDC2010 is configured to sample once every 5 seconds (0.2Hz). This is accomplished by writing the appropriate setting to the Configuration Register (0x0E). An illustration of the Configuration Register setup is provided in Figure 2-5.

Figure 2-5 Configuration Register for Auto Measurement Mode (AMM)

// set device to Auto Measurement Mode for 0.2Hz (1 sample/5 seconds)

Wire.beginTransmission(0x40); // start communication with HDC2x

Wire.write(0x0E); // point to register 0x0E (Measurement Config)
Wire.write(0x40); // write value to register

Wire.endTransmission(); // end communication

The Measurement Configuration Register uses the same configuration explained in the Trigger-On Demand section.

Visit the following link to view the full sample code for the HDC2x in Auto Measurement Mode.