RE: SHT31 readout on nRF9160 using the Zephyr Sample

Simon — Wed, 20 Jan 2021 11:56:34 GMT

No problem, I'm happy to help, and glad you made it work 🙂

RE: SHT31 readout on nRF9160 using the Zephyr Sample

Christian Zingl — Wed, 20 Jan 2021 10:53:51 GMT

Thank you very much for your help! This resolved the problem and the sensor works.

RE: SHT31 readout on nRF9160 using the Zephyr Sample

Simon — Wed, 20 Jan 2021 08:49:35 GMT

Try to add the following content to nrf9160dk_nrf9160ns.overlay, that should compile fine

&i2c2 { /* SDA P0.26, SCL P0.27, ALERT P1.10 */
    status = "okay";
    compatible = "nordic,nrf-twim";
    sda-pin = < 30 >;
    scl-pin = < 31 >;
    sht3xd@44 {
		compatible = "sensirion,sht3xd";
		reg = <0x44>;
		label = "SHT3XD";
	};
};

Explanation:

The reason it failed initially was because you hadn't enabled the i2c0 node (status="okay"), in addition you need to add the required fields compatible, sda-pin and scl-pin. However, since both uart0 and uart1 is enabled in ncs\v1.4.0\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_common.dts you can't use i2c0 or i2c1, since they occupy the same memory. Instance i2c2 should be fine to use, however for that instance, all the fields are already set, so it's not really necessary to set them again in the overlay file.

Best regards,

Simon