Created June 16, 2021

Wearable Smart Home Control Hub

Things used in this project

Hardware components

Nordic Semiconductor nRF5340 Development Kit

Story

1 Introduction

Wearable Smart Home Control Hub can control light, AC, music player and TV all on waist band.

2 Hardware and Software

nRF5340 DK + Adafruit Display + nRF52840 Dongle

nRF SDK 1.6.0 rc2

Segger IDE

3 Installing IDE and SDKs

3.1 The proper segger driver shall be installed. But the download do not work fine and the nRF Programmer can not work well as follows, Which shall be solved later,

3.2 After several try, the debug can work. The design can continue with the follows functions, Build one Wearable Smart Home Control Hub to control light, AC, music player and TV all on waist band by touch panels and GUI. This is different from existing smart solutions, all by moble APPs. In fact, no one carry mobile around the house as waist band can do. That is simply much portable and energy saving. nRF5340 is low-life battery powered.

3.3 Touch Panel shall work with SPI, Touch panel with vivid GUI on waist can be used as control UI. Control command sent by Bluetooth 5.2 to remote bluetooth controlled smart light or A/C, TV etc. Main features include, Bluetooth pairing, GUI interface, Remote controll.

4 Coding and Demo

4.1 Start nRF connect and open IDE ToolChain

1 / 2

4.2 Start the Segger Embedded Studio and New Project from nRF SDK, use cupnet core for BLE,

4.3 Coding is modular with Zephyr OS, same coding can be done with west commands.

It is simple to start bluetooth LE

void main(void)
{
	int err;

	printk("Initializing...\n");

	err = bt_enable(bt_ready);
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
	}
}

Start the bt_ready with bt_mesh_init()

static void bt_ready(int err)
{
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
		return;
	}

	printk("Bluetooth initialized\n");

	dk_leds_init();
	dk_buttons_init(NULL);

	err = bt_mesh_init(bt_mesh_dk_prov_init(), model_handler_init());
	if (err) {
		printk("Initializing mesh failed (err %d)\n", err);
		return;
	}

	if (IS_ENABLED(CONFIG_SETTINGS)) {
		settings_load();
	}

	/* This will be a no-op if settings_load() loaded provisioning info */
	bt_mesh_prov_enable(BT_MESH_PROV_ADV | BT_MESH_PROV_GATT);

	printk("Mesh initialized\n");
}

With Button and LED, connect On/Off relay and LEDs can trigger the control of motor and LED on smart home. That make the frame applicable to smart home control

4.4 Build and run the programs with zyphyr.elf binary code, download the binary file in flash via J-link

Debug the code step by step then.

4.5 Start nRF connect mobile

1 / 2

5 Plug Power or Battery and Run

Power the board with USB, the board can run with bluetooth.

That would be important to make the board run with customized mobile APP. That part is still on progress now.

1 / 2

WIth LCD panel the GUI shall be build with the pin assignment.

The Project is still on the way.

#include <bluetooth/bluetooth.h>
#include <bluetooth/mesh/models.h>
#include <bluetooth/mesh/dk_prov.h>
#include <dk_buttons_and_leds.h>
#include "model_handler.h"

static void bt_ready(int err)
{
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
		return;
	}

	printk("Bluetooth initialized\n");

	dk_leds_init();
	dk_buttons_init(NULL);

	err = bt_mesh_init(bt_mesh_dk_prov_init(), model_handler_init());
	if (err) {
		printk("Initializing mesh failed (err %d)\n", err);
		return;
	}

	if (IS_ENABLED(CONFIG_SETTINGS)) {
		settings_load();
	}

	/* This will be a no-op if settings_load() loaded provisioning info */
	bt_mesh_prov_enable(BT_MESH_PROV_ADV | BT_MESH_PROV_GATT);

	printk("Mesh initialized\n");
}

void main(void)
{
	int err;

	printk("Initializing...\n");

	err = bt_enable(bt_ready);
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
	}
}

#include <bluetooth/bluetooth.h>
#include <bluetooth/mesh/models.h>
#include <dk_buttons_and_leds.h>
#include "model_handler.h"

/* Light switch behavior */

/** Context for a single light switch. */
struct button {
	/** Current light status of the corresponding server. */
	bool status;
	/** Generic OnOff client instance for this switch. */
	struct bt_mesh_onoff_cli client;
};

static void status_handler(struct bt_mesh_onoff_cli *cli,
			   struct bt_mesh_msg_ctx *ctx,
			   const struct bt_mesh_onoff_status *status);

static struct button buttons[4] = {
	[0 ... 3] = { .client = BT_MESH_ONOFF_CLI_INIT(&status_handler) },
};

static void status_handler(struct bt_mesh_onoff_cli *cli,
			   struct bt_mesh_msg_ctx *ctx,
			   const struct bt_mesh_onoff_status *status)
{
	struct button *button =
		CONTAINER_OF(cli, struct button, client);
	int index = button - &buttons[0];

	button->status = status->present_on_off;
	dk_set_led(index, status->present_on_off);

	printk("Button %d: Received response: %s\n", index + 1,
	       status->present_on_off ? "on" : "off");
}

static void button_handler_cb(uint32_t pressed, uint32_t changed)
{
	if (!bt_mesh_is_provisioned()) {
		return;
	}

	for (int i = 0; i < 4; ++i) {
		if (!(pressed & changed & BIT(i))) {
			continue;
		}

		struct bt_mesh_onoff_set set = {
			.on_off = !buttons[i].status,
		};
		int err;

		/* As we can't know how many nodes are in a group, it doesn't
		 * make sense to send acknowledged messages to group addresses -
		 * we won't be able to make use of the responses anyway.
		 */
		if (bt_mesh_model_pub_is_unicast(buttons[i].client.model)) {
			err = bt_mesh_onoff_cli_set(&buttons[i].client, NULL,
						    &set, NULL);
		} else {
			err = bt_mesh_onoff_cli_set_unack(&buttons[i].client,
							  NULL, &set);
			if (!err) {
				/* There'll be no response status for the
				 * unacked message. Set the state immediately.
				 */
				buttons[i].status = set.on_off;
				dk_set_led(i, set.on_off);
			}
		}

		if (err) {
			printk("OnOff %d set failed: %d\n", i + 1, err);
		}
	}
}

Wearable Smart Home Control Hub

Things used in this project

Hardware components

Story

1 Introduction

2 Hardware and Software

3 Installing IDE and SDKs

4 Coding and Demo

Code

main.c

model_handler.c

Credits

F. Yao

Comments

Embed the widget on your own site

Wearable Smart Home Control Hub

Wearable Smart Home Control Hub

Things used in this project

Hardware components

Story

1 Introduction

2 Hardware and Software

3 Installing IDE and SDKs

4 Coding and Demo

Code

main.c

model_handler.c

Credits

F. Yao

Comments