In this post, we’ll learn how to build a simple IoT “Pill Reminders” device to remind the patient to take the pill and as soon as he/she took the pill, we will get the update status in Google Sheets.
- BBC micro:bit
- Edge connector breakout board for micro:bit
- LED (or a buzzer)
- Magnetic door contact switch
- Mini breadboard
- Mini PC with bluetooth connection
- Pill container
- SAP Cloud Connector
- SAP Cloud Platform: SAP Cloud Foundry
- NodeJS App
- Google Sheets
How it works ?
- We define the time schedules in Google Sheets column “InputTime” when the patient is supposes to take the pill. Google Scripts will run every 5 minutes to check the entered time schedules and status, and then send the message to SAP Cloud Foundry via a webhook HTTP Post request
- SAP Cloud Foundry routes the message to pill reminder server
- Pill Reminder server receives the message and send it to pill reminder device via bluetooth connection
- The LED light (we also can add sound) on pill reminder device will blink to alert the patient to take the pill.The LED Light will stop blinking only when the patient opens the pill container (presumably that he or she will take the pill) and the timestamp will be recorded in Google Sheets column “Timestamp“. We will get the timestamp from this column when the patient has taken the pill.
- The process will keep continue.
High Level Diagram
Google Sheets Setup
Create a new Sheets called PillReminder and populate the following columns:
This is the time schedule that we will enter to remind the patient to take the pill at a certain time.
This field will be auto populated with the timestamp when the patient open the pill container (to take the pill)
This is the message that will be sent to pill reminder device. At this moment is not implemented, in the future we can send the voice message or text message displayed on the LED screen on pill reminder device
- Send Notification
This field will be populated with status “y” when the message is send out.
We will create Google Script, Code.gs to check the InputTime and perform the HTTP Post message to SAP Cloud Foundry.
To insert Google Script, select Tools and Script Editor.
Update the following information with yours:
var URL= 'SAP_CLOUD_FOUNDRY_APP_URL'; var username = 'SAP_CLOUD_FOUNDRY_USER_ID'; var password = 'SAP_CLOUD_FOUNDRY_USER_PASSWORD';
Select Edit and Current project’s triggers to define the time interval when the script will be executed.
Click Add Trigger.
Select the following configuration to run CheckStatus script every 5 minutes and click Save.
- Choose which function to run: CheckStatus
- Choose which deployment should run: Head
- Select event source: Time-driven
- Select type of time based trigger: Minutes timer
- Select minute interval: Every 5 minutes
NodeJS “Pill Reminder Server” Setup
Install the following libs that are required by our app:
npm install express body-parser request edit-google-spreadsheet bbc-microbit
We need to create a project and create the oauth2 credential in order to load and modify the Google Sheets from NodeJS app.
- Go to https://console.developers.google.com/ and create a new project PillReminder.
- Within the project, click Enable APIs and Services.
- Search for Google Sheets API.
- Click Enable.
- Go back to project page and click Create Credentials. Then select OAuth client ID.
- Select Application Type Other, enter name Pill Reminder and click Create.
- Copy the client ID and client secret.
- Download get_oauth2_permissions.js and paste the client ID and client secret.
- Run get_oauth2_permissions.js. The program will ask you to open the URL and enter the code generated from that URL
- Open the URL and copy the code.
- Enter the generated code and if there is no error we will get the oauth2 information
- Copy that oauth2 information together with spreadsheetId into UpdateGoogleSheet function in index.js.
- Before we can run the app, we need to flash (update the firmware) the micro:bit. Plugin your micro:bit to your USB PC, download the firmware and drag it onto micro:bit. You will see the LED light on micro:bit is blinking. Once is done, you will see the scrolling message “DC”.
- Finally we can run the app with command:
sudo node index.js
SAP Cloud Connector Setup
Create Cloud To On Premise connection pointing to NodeJS Pill Reminder Server app.
SAP Cloud Foundry Setup
Create the Destination on SAP Cloud Foundry nodeBackend1 pointing to NodeJS Pill Reminder Server app.
Create the required service instances: connectivity-demo-lite, destinationnode-demo-lite and
And finally deploy the app appnode-demo.
Full source code is here.
That’s all and thanks !!