samples: sensor: dht: add sample

#

# Copyright (c) 2019 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: Apache-2.0

#

cmake_minimum_required(VERSION 3.13.1)

include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)

project(dht)

FILE(GLOB app_sources src/*.c)

target_sources(app PRIVATE ${app_sources})

.. _dht:

DHT: Aosong DHT Digital-output Humidity and Temperature Sensor

##############################################################

Description

***********

This sample application periodically (0.5 Hz) measures the ambient

temperature and humidity. The result is written to the console.

Wiring

*******

This sample uses an external breakout for the sensor.  A devicetree

overlay must be provided to identify the sensor variant and the GPIO

used to control the sensor.

Building and Running

********************

After providing a devicetree overlay that specifies the sensor location,

build this sample app using:

.. zephyr-app-commands::

   :zephyr-app: samples/sensor/dht

   :board: nrf52_pca10040

   :goals: build flash

Sample Output

=============

.. code-block:: console

   *** Booting Zephyr OS build zephyr-v2.1.0-329-g38418b26c4cc  ***

   [0:00:00.027]: 20.0 Cel ; 48.7 %RH

   [0:00:02.053]: 19.8 Cel ; 48.7 %RH

   [0:00:04.079]: 20.0 Cel ; 48.7 %RH

   [0:00:06.105]: 19.8 Cel ; 48.7 %RH

   [0:00:08.130]: 20.0 Cel ; 48.8 %RH

   [0:00:10.156]: 20.1 Cel ; 48.8 %RH

   [0:00:12.182]: 19.7 Cel ; 48.7 %RH

   [0:00:14.207]: 20.0 Cel ; 48.8 %RH

<repeats endlessly>

/*

 * Copyright (c) 2019 Nordic Semiconductor ASA

 *

 * SPDX-License-Identifier: Apache-2.0

 */

/ {

	dht22 {

		compatible = "aosong,dht";

		status = "okay";

		label = "DHT22";

		dio-gpios = <&gpio0 11 0>;

		dht22;

	};

};

#

# Copyright (c) 2019 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: Apache-2.0

#

CONFIG_SENSOR=y

CONFIG_GPIO=y

CONFIG_DHT=y

# Need float format support

CONFIG_NEWLIB_LIBC=y

CONFIG_NEWLIB_LIBC_NANO=n

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

#

# Copyright (c) 2019 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: Apache-2.0

#

sample:

  name: DHT Sensor Sample

tests:

  sample.sensor.dht:

    build_only: true

    platform_whitelist: nrf52_pca10040

    tags: sensors