Jim Carver / Mbed OS GarageDoorOpener

Garage Door Monitor and Opener

Dependencies:   X_NUCLEO_COMMON ST_INTERFACES

Introduction

This system implements a simple garage door opener and environmental monitor. The hardware connects to the internet using Wi-Fi then on to the Pelion Device Management Platform which provides device monitoring and secure firmware updates over the air (FOTA). Pelion Device Management provides a flexible set of REST APIs which we will use to communicate to a web application running on an EC-2 instance in AWS. The web application will serve a web page where we can monitor and control our garage..

This project is intended to work on the DISCO-L475VG-IOT01A from ST Microelectronics It implements a simple actuator to drive a relay to simulate pushing the "open" button on older style garage doors which do not use a rolling code interface.

The system is designed to be mounted over the door so that the on board time of flight sensor can be used to detect if the door is open or closed.

The system also monitors temperature, humidity and barometric pressure.

https://os.mbed.com/media/uploads/JimCarver/garageopener.jpg

Hardware Requirements:

DISCO-L475G-IOT01A https://os.mbed.com/platforms/ST-Discovery-L475E-IOT01A/

Seeed Studio Grove Relay module https://www.seeedstudio.com/Grove-Relay.html

Seeed Studio Grove cable, I used this one: https://www.seeedstudio.com/Grove-4-pin-Male-Jumper-to-Grove-4-pin-Conversion-Cable-5-PCs-per-Pack.html

Connect to the PMOD connector like this:

https://os.mbed.com/media/uploads/JimCarver/opener.jpg

This shows how I installed so that the time of flight sensor can detect when the door is open

https://os.mbed.com/media/uploads/JimCarver/opener1.jpg https://os.mbed.com/media/uploads/JimCarver/opener2.jpg

To use the project:

You will also need a Pelion developers account.

I suggest you first use the Pelion quick state to become familiar with Pelion Device Management. https://os.mbed.com/guides/connect-device-to-pelion/1/?board=ST-Discovery-L475E-IOT01A

Web Interface

For my web interface I am running node-red under Ubuntu in an EC2 instance on AWS. This can run for 12 month within the constraints of their free tier. Here is a tutorial: https://nodered.org/docs/getting-started/aws

You will also need to install several node-red add ons:

sudo npm install -g node-red-dashboard

sudo npm install -g node-red-contrib-mbed-cloud

sudo npm istall -g node-red-contrib-moment

After starting node-red import the contents of GarageFlow.txt from the project, pin the flow into the page.

To enable your web app to access your Pelion account you need an API key.

First you will neet to use your Pelion account to create an API key.

https://os.mbed.com/media/uploads/JimCarver/api_portal.jpg

Now we need to apply that API key to your Node-Red flow.

https://os.mbed.com/media/uploads/JimCarver/api_node-red.jpg

Diff: main.cpp

Revision:
11:8df4529f060d
Parent:
10:b27c962b3c3f
Child:
12:1f1a50e973db
--- a/main.cpp	Sat Dec 08 01:46:22 2018 +0000
+++ b/main.cpp	Mon Dec 10 10:42:29 2018 +0000
@@ -20,13 +20,13 @@
 #include "simple-mbed-cloud-client.h"
 #include "LittleFileSystem.h"
 
-//#define SENSORS_AND_BUTTONS
+#define SENSORS_AND_BUTTONS
 #ifdef SENSORS_AND_BUTTONS
 #include "HTS221Sensor.h"
 #include "LPS22HBSensor.h"
 #include "LSM6DSLSensor.h"
 #include "lis3mdl_class.h"
-#include "VL53L0X.h"
+// #include "VL53L0X.h"
 
 static DevI2C devI2c(PB_11,PB_10);
 static HTS221Sensor hum_temp(&devI2c);
@@ -34,9 +34,10 @@
 static LSM6DSLSensor acc_gyro(&devI2c,LSM6DSL_ACC_GYRO_I2C_ADDRESS_LOW,PD_11); // low address
 static LIS3MDL magnetometer(&devI2c);
 static DigitalOut shutdown_pin(PC_6);
-static VL53L0X range(&devI2c, &shutdown_pin, PC_7);
+// static VL53L0X range(&devI2c, &shutdown_pin, PC_7);
 
 InterruptIn button(USER_BUTTON);
+#define SENSORS_POLL_INTERVAL 1.0
 #endif /* SENSORS_AND_BUTTONS */
 
 // An event queue is a very useful structure to debounce information between contexts (e.g. ISR and normal threads)
@@ -51,9 +52,12 @@
 SlicingBlockDevice sd(bd, 0, 2*1024*1024);
 LittleFileSystem fs("fs", &sd);
 
+// Default LED to use for PUT/POST
+DigitalOut led(LED1);
+
 // Declaring pointers for access to Pelion Client resources outside of main()
 MbedCloudClientResource *button_res;
-MbedCloudClientResource *pattern_res;
+MbedCloudClientResource *led_res;
 
 #ifdef SENSORS_AND_BUTTONS
 // Additional resources for sensor readings
@@ -66,21 +70,13 @@
 static const ConnectorClientEndpointInfo* endpointInfo;
 
 /**
- * Button function triggered by the physical button press or by timer depending on SENSORS_AND_BUTTONS macro.
- */
-void button_press() {
-    int v = button_res->get_value_int() + 1;
-    button_res->set_value(v);
-    printf("Button clicked %d times\n", v);
-}
-
-/**
  * PUT handler
  * @param resource The resource that triggered the callback
  * @param newValue Updated value for the resource
  */
-void pattern_updated(MbedCloudClientResource *resource, m2m::String newValue) {
+void led_put_callback(MbedCloudClientResource *resource, m2m::String newValue) {
     printf("PUT received, new value: %s\n", newValue.c_str());
+    led = atoi(newValue.c_str());
 }
 
 /**
@@ -90,27 +86,18 @@
  *               Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
  * @param size Size of the body
  */
-void blink_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
-    printf("POST received. Going to blink LED pattern: %s\n", pattern_res->get_value().c_str());
-
-    static DigitalOut augmentedLed(LED1); // LED that is used for blinking the pattern
+void led_post_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
+    printf("POST received. Going to blink LED pattern: %s\n", led_res->get_value().c_str());
+    led = atoi(led_res->get_value().c_str());
+}
 
-    // Parse the pattern string, and toggle the LED in that pattern
-    string s = std::string(pattern_res->get_value().c_str());
-    size_t i = 0;
-    size_t pos = s.find(':');
-    while (pos != string::npos) {
-        wait_ms(atoi(s.substr(i, pos - i).c_str()));
-        augmentedLed = !augmentedLed;
-
-        i = ++pos;
-        pos = s.find(':', pos);
-
-        if (pos == string::npos) {
-            wait_ms(atoi(s.substr(i, s.length()).c_str()));
-            augmentedLed = !augmentedLed;
-        }
-    }
+/**
+ * Button function triggered by the physical button press or by timer depending on SENSORS_AND_BUTTONS macro.
+ */
+void button_press() {
+    int v = button_res->get_value_int() + 1;
+    button_res->set_value(v);
+    printf("Button clicked %d times\n", v);
 }
 
 /**
@@ -131,10 +118,10 @@
     endpointInfo = endpoint;
 }
 
-#ifdef SENSORS_AND_BUTTONS
 /**
  * Initialize sensors
  */
+#ifdef SENSORS_AND_BUTTONS
 void sensors_init() {
     uint8_t id;
 
@@ -143,7 +130,7 @@
     press_temp.init(NULL);
     acc_gyro.init(NULL);
     magnetometer.init(NULL);
-    range.init_sensor(VL53L0X_DEFAULT_ADDRESS);
+    // range.init_sensor(VL53L0X_DEFAULT_ADDRESS);
 
     /// Call sensors enable routines
     hum_temp.enable();
@@ -189,7 +176,7 @@
 
     value1 = value2 = 0.0;
     press_temp.get_temperature(&value1);
-    press_temp.get_pressure(&value2);
+    // press_temp.get_pressure(&value2);
     printf("LPS22HB: [temp] %.2f C, [press] %.2f mbar\r\n", value1, value2);
     printf("Mag/Acc/Gyro readings:        x,      y,      z\r\n");
 
@@ -200,16 +187,16 @@
     acc_gyro.get_g_axes(axes);
     printf("LSM6DSL [gyro/mdps]:     %6ld, %6ld, %6ld\r\n", axes[0], axes[1], axes[2]);
 
-    if (range.get_distance(&distance) == VL53L0X_ERROR_NONE) {
-        printf("VL53L0X [mm]:            %6ld\r\n", distance);
-        if (endpointInfo) {
-            distance_res->set_value((int)distance);
-        }
-    } else {
-        printf("VL53L0X [mm]:                --\r\n");
-    }
+    // if (range.get_distance(&distance) == VL53L0X_ERROR_NONE) {
+    //     printf("VL53L0X [mm]:            %6ld\r\n", distance);
+    //     if (endpointInfo) {
+    //         distance_res->set_value((int)distance);
+    //     }
+    // } else {
+    //     printf("VL53L0X [mm]:                --\r\n");
+    // }
 
-    printf("\033[8A");
+    printf("\033[7A");
 }
 #endif /* SENSORS_AND_BUTTONS */
 
@@ -276,15 +263,6 @@
     button_res->observable(true);
     button_res->attach_notification_callback(button_callback);
 
-    pattern_res = client.create_resource("3201/0/5853", "blink_pattern");
-    pattern_res->set_value("500:500:500:500:500:500:500:500");
-    pattern_res->methods(M2MMethod::GET | M2MMethod::PUT);
-    pattern_res->attach_put_callback(pattern_updated);
-
-    MbedCloudClientResource *blink_res = client.create_resource("3201/0/5850", "blink_action");
-    blink_res->methods(M2MMethod::POST);
-    blink_res->attach_post_callback(blink_callback);
-
 #ifdef SENSORS_AND_BUTTONS
     // Sensor resources
     temperature_res = client.create_resource("3303/0/5700", "temperature");
@@ -297,12 +275,17 @@
     humidity_res->methods(M2MMethod::GET);
     humidity_res->observable(true);
 
-    distance_res = client.create_resource("3330/0/5700", "distance");
-    distance_res->set_value(0);
-    distance_res->methods(M2MMethod::GET);
-    distance_res->observable(true);
+    // distance_res = client.create_resource("3330/0/5700", "distance");
+    // distance_res->set_value(0);
+    // distance_res->methods(M2MMethod::GET);
+    // distance_res->observable(true);
 #endif /* SENSORS_AND_BUTTONS */
 
+    // led_res = client.create_resource("3201/0/5853", "led_state");
+    // led_res->set_value(1);
+    // led_res->methods(M2MMethod::GET | M2MMethod::PUT);
+    // led_res->attach_put_callback(led_put_callback);
+
     printf("Initialized Pelion Client. Registering...\n");
 
     // Callback that fires when registering is complete
@@ -314,10 +297,10 @@
     // Placeholder for callback to update local resource when GET comes.
     // The timer fires on an interrupt context, but debounces it to the eventqueue, so it's safe to do network operations
 #ifdef SENSORS_AND_BUTTONS
-    button.fall(eventQueue.event(button_press));
+    button.fall(eventQueue.event(&button_press));
 
     Ticker timer;
-    timer.attach(eventQueue.event(sensors_update), 3.0);
+    timer.attach(eventQueue.event(&sensors_update), SENSORS_POLL_INTERVAL);
 #else /* SENSORS_AND_BUTTONS */
     Ticker timer;
     timer.attach(eventQueue.event(&button_press), 5.0);