•

Yash Nayak

Published March 5, 2020

Smart Tea Machine Using Bolt IoT (UPI Payments)

A Smart Tea Machine Using Bolt IoT with Real-time Payment integration(UPI/BHIM/Paytm/PhonePe/Google Pay/WhatsApp Pay).

AdvancedFull instructions provided5 hours4,727

Smart Tea Machine Using Bolt IoT (UPI Payments)

Things used in this project

Hardware components

Bolt IoT Bolt WiFi Module

Tea Machine

(Old)

Adafruit 5v Relay Module

Jumper wires (generic)

Breadboard (generic)

UTSOURCE Electronic Parts

Software apps and online services

Bolt IoT Bolt Cloud

Android Studio

Unified Payments Interface (UPI)

Integromat

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Story

Introduction

The Smart Tea Machine is a simple demonstration of how Unified Payments Interface (UPI) can be integrated with devices especially devices like Bolt IoT, Raspberry Pi, etc. It shows the relative ease and simple code that can be used to have basic functionality in a standard machine without display.

The main idea of this project is to make a machine that can be used with the Indian payment system with UPI and works with apps like BHIM, Paytm, PhonePe, Google Pay, WhatsApp Pay and many more.

The Existing old tea machine is used to prove the concept.***

How It Works

A standard old tea machine has been modified to be controlled by a Bolt IoT WiFi Module with a 5v Relay. The Bolt IoT WiFi Module is directly connected to the 5V DC Pump inside the Tea machine. The Bolt IoT WiFi Module connects over WiFi to a Bolt Cloud and an integromat scenario with webhook checks regularly to see if a new transaction has done on the app. When it finds one, it wakes the Tea machine and dispenses a Tea.

Flow diagram

Hardware Setup

Buy electronic components with free shipping on utsource.net

Opening the Old Tea Machine

Soldering

Now that the machine is open we are going to solder 2 wire to the DV Pump. As you can see in the image above.

Bolt IoT Connection

Circuit Diagram

The connections between the Relay and BoltIoT are:

Bolt IoT PIN0: Relay IN
Bolt IoT 5v: Relay Vcc
Bolt IoT Gnd: Relay Gnd
Bolt IoT 5v: Relay Com
Relay NO: DC Pump(+)
Bolt IoT Gnd: DC Pump(-)

The final wiring for the project looks a bit messy but worked just fine.

After it was all wired up, We just test it out with a basic on-off program and then proceeded to check that the relay was firing.

Now let’s start building the app.

For those of you who don’t know UPI (Unified Payments Interface), UPI was developed by the National Payments Corporation of India, make making payments between different bank accounts a hassle-free process. There are many UPI client apps and you can link more than one bank account with your UPI app. You can read more about it here.

UPI Intent

By using the UPI Intent as the payment method, you can ease the UPI payments for your services thus providing a superior user experience to people.

Benefits of UPI Intent

While you enjoy the benefits such as higher conversion rates, decrease in abandoned carts and a decrease in time to complete the payment, your customers are also benefitted in the following ways:

No need to handle push or SMS notifications
No need to switch between applications to complete a payment (merchant, SMS, app)
No need to remember their VPAs

Understanding the Intent flow

In the UPI Intent flow, the customer selects UPI as the payment method on your website or app. A list of UPI apps supporting the intent flow is displayed.
Customers select their preferred app. The UPI app opens with pre-populated payment details is displayed.
Customers enter the UPI PIN to complete their transactions.
After the successful payment, the customer is redirected to your app or website.

To know more about the UPI Intent on Android apps, refer to the Android UPI Intent flow.

Building up the logic on Integromat

In order to control our tea machine with our app, we will create a scenario on Integromat. In which we will be using webhooks to communicate between the app and Bolt IoT Cloud. You can upload our blueprint and modify it in your account.

Click on web-hooks and copy the webhook address for further reference.

The code

Prerequisite: Android Studio

You can simply download the code directly from here.

And change your credentials like UPI id, name, amount, description, and webhook address according to your needs.

Note:- Make sure that your device has at least one UPI app installed.

For testing, You can download the app from here.

After finishing the transaction, we return back to our app and check whether the transaction was successful by setting up the callback Listeners method and trigger the hardware to dispense the tea.

Putting It All Together

Finally, it was time to power on the Bolt IoT WiFi Module and check all the routines and app are working as per planned.

We are done!

We hope this gives you an idea of how you might go about integrating Unified Payments Interface (UPI) with the Bolt IoT WiFi Module.

Let us know if you have any questions!!

Schematics

Code

{
    "name": "Tea Machine App Connect",
    "flow": [
        {
            "id": 9,
            "module": "gateway:CustomWebHook",
            "version": 1,
            "parameters": {
                "hook": 326103,
                "maxResults": 2
            },
            "mapper": {},
            "metadata": {
                "designer": {
                    "x": -29,
                    "y": -38
                },
                "restore": {
                    "hook": {
                        "label": "TeaMachineHook"
                    }
                },
                "parameters": [
                    {
                        "name": "hook",
                        "type": "hook",
                        "label": "Webhook",
                        "required": true
                    },
                    {
                        "name": "maxResults",
                        "type": "number",
                        "label": "Maximum number of results"
                    }
                ],
                "interface": []
            }
        },
        {
            "id": 6,
            "module": "bolt-iot:executeCommand",
            "version": 1,
            "parameters": {
                "__IMTCONN__": 943954
            },
            "mapper": {
                "command": "digitalWrite",
                "parameters": {
                    "pin": "0",
                    "state": "HIGH",
                    "deviceName": "BOLT293850"
                }
            },
            "metadata": {
                "designer": {
                    "x": 259,
                    "y": -50
                },
                "restore": {
                    "command": {
                        "label": "Write digital output"
                    },
                    "__IMTCONN__": {
                        "label": "Yash Nayak's (BOLT293850)"
                    }
                },
                "parameters": [
                    {
                        "name": "__IMTCONN__",
                        "type": "account",
                        "label": "Connection",
                        "required": true
                    }
                ],
                "expect": [
                    {
                        "name": "command",
                        "type": "select",
                        "label": "Command",
                        "required": true,
                        "validate": {
                            "enum": [
                                "digitalWrite",
                                "digitalRead",
                                "analogRead",
                                "analogWrite",
                                "serialBegin",
                                "serialWrite",
                                "serialRead",
                                "version",
                                "restart",
                                "isAlive"
                            ]
                        }
                    },
                    {
                        "name": "parameters",
                        "spec": [
                            {
                                "name": "deviceName",
                                "type": "text",
                                "label": "Device name",
                                "required": true
                            },
                            {
                                "name": "pin",
                                "type": "text",
                                "label": "Pin",
                                "required": true
                            },
                            {
                                "name": "state",
                                "type": "text",
                                "label": "State",
                                "required": true
                            }
                        ],
                        "type": "collection",
                        "label": "Parameters"
                    }
                ]
            }
        },
        {
            "id": 7,
            "module": "util:FunctionSleep",
            "version": 1,
            "parameters": {},
            "mapper": {
                "duration": "20"
            },
            "metadata": {
                "designer": {
                    "x": 480,
                    "y": -35
                },
                "expect": [
                    {
                        "name": "duration",
                        "type": "uinteger",
                        "label": "Delay",
                        "required": true,
                        "validate": {
                            "max": 300,
                            "min": 1
                        }
                    }
                ]
            }
        },
        {
            "id": 8,
            "module": "bolt-iot:executeCommand",
            "version": 1,
            "parameters": {
                "__IMTCONN__": 943954
            },
            "mapper": {
                "command": "digitalRead",
                "parameters": {
                    "pin": "0",
                    "deviceName": "BOLT293850"
                }
            },
            "metadata": {
                "designer": {
                    "x": 711,
                    "y": -53
                },
                "restore": {
                    "command": {
                        "label": "Read digital input"
                    },
                    "__IMTCONN__": {
                        "label": "Yash Nayak's (BOLT293850)"
                    }
                },
                "parameters": [
                    {
                        "name": "__IMTCONN__",
                        "type": "account",
                        "label": "Connection",
                        "required": true
                    }
                ],
                "expect": [
                    {
                        "name": "command",
                        "type": "select",
                        "label": "Command",
                        "required": true,
                        "validate": {
                            "enum": [
                                "digitalWrite",
                                "digitalRead",
                                "analogRead",
                                "analogWrite",
                                "serialBegin",
                                "serialWrite",
                                "serialRead",
                                "version",
                                "restart",
                                "isAlive"
                            ]
                        }
                    },
                    {
                        "name": "parameters",
                        "spec": [
                            {
                                "name": "deviceName",
                                "type": "text",
                                "label": "Device name",
                                "required": true
                            },
                            {
                                "name": "pin",
                                "type": "text",
                                "label": "Pin",
                                "required": true
                            }
                        ],
                        "type": "collection",
                        "label": "Parameters"
                    }
                ]
            }
        }
    ],
    "metadata": {
        "version": 1,
        "scenario": {
            "roundtrips": 1,
            "maxErrors": 3,
            "autoCommit": false,
            "sequential": false,
            "confidential": false,
            "dataloss": false,
            "dlq": false
        },
        "designer": {
            "orphans": []
        },
        "zone": "eu1.integromat.com"
    }
}

Credits

Ashfaque KK

5 projects • 3 followers

Yash Nayak

9 projects • 73 followers

Maker | Innovator | Technology Enthusiastic

Smart Tea Machine Using Bolt IoT (UPI Payments)