The inspiration of the project was taken from the waste management necessity for our planet. To target a zero waste planet, healthy habits with useful gadgets can help us move towards this global goal. 

The most common issue we see is that in the public spaces and streets the trash bins are collected and emptied without even checking if they are full or not which leads to waste of resources. And sometimes, the trash bins would start overflowing and waste would collect and would continue to pile up ruining the natural and preserved spaces. To target this issue we started at a smaller level.

We planned on implementing this idea at home by implementing a smart bin - a 'TrashBot' which upon measuring the temperature of the waste would detect the decay and send an alert to user to empty the trash. Along with creating a fun home automation project this will help create a healthy habit of being mindful of clearing the waste timely.

This project can then be expanded for largescale implementation especially in residential area streets and parks. Before trash overflows and starts to decay spreading unpleasant smell in beautiful natural spaces, Trashbot will send an alert to the waste collectors.

Temperature Sensor usage

Trashbot receives its temperature readings via two Tsic 306 temperature sensors, which have an error of +-0.3 K and a sampling rate of 10 Hz. These are connected to the Pi via the ground and 5V Power, and with the data pins connected to seperate GPIO ports. The TSIC Temperature Sensors will communicate to the Pi passing the current temperature reading from the sensor through two packets of data transmitted at a Baud Rate of 8kHz This is done through the ZACWire Protocol. The Pi will interrupt on every bit received, storing the bit and decoding it into a temperature once both packets arrive.

Temperature Sensor Component

As stated the temperature sensors utilised within the system are two TSIC 306 sensors These can be found on RS-Online for a price of £6.46 each.

The sensor has Three pins:

Which were soldered to distinct wires

The Power wires were then connected to the same Power pin on the Raspberry Pi, similarly to the Ground wires connected to the same ground pin on the raspberryPi. GPIO pins 23 and 24 were connected to the remaining Data wires.


How the message works:

The main functionality of the message functionality was created by following the guide found here: The code relies on 4 Classes for sending the message: ‘MySMTP’, ‘Socket’, ’MyOpenSSL’ and ‘Messaging’. The SMTP class which takes the server address, the port, the sender and the destination and the message subject and body. Socket maintaints the connection using the server address and port information. Since gmail is used the service address is and the port is 465 because Secure Sockets Layer (SSL) is used. SSL is a secure way to read and write data to the connection. For simple implementation in the main program a messaging class is created. It defines everything SMTP needs to send a message and creates different messages for when Trashbot starts up, when the trash is heating up and when the trash has to be taken out. 

Message usage:

Currently the message contents and destination are hardcoded and can only be changed in Messaging.cpp

Graphical User Interface using Qt/ Qwt Widgets:

A layout in QT is defined in a declarative way as layout classes forexample horizontal or vertical layouts.

From existing widgets like QwtThermo you can get a thermometer widget and then set its size and color accordingly using its functions.

With various available classes like QLabel and Qfont you can change font size, colors and add labels to your GUI window.

Downloading the source code and after installing the required libraries mentioned in instructions above. You can get this handy GUI up and running in no time and can play around with  it to make it your own!