A Dissertation Submitted in Partial Fulfilment of the Requirements for the Degree of Master of Science in Embedded and Mobile Systems of the Nelson Mandela African Institution of Science and TechnologyThe impulse in designing local agricultural machinery for curbing post-harvest losses in most
African countries particularly Tanzania is unmatched. Locally made agricultural machines have
proven to elevate the life of many small-scale farmers, which has increased the need to incorporate
machine drives and controls to ease the process and operations. With potentials in Solar Energy,
powering machine drive systems that operate in off-grid areas has been the best solution. Using the
principles of Internet of Things (IoT) together with advancement in motor designs and readily
available off the shelf microcontrollers such as the Raspberry Pi and Arduino UNO in the market,
we achieve machinery that caters for our needs and the local content. Mobile apps play a huge role
in industrialization where monitoring and even controls of machines can be performed by the
mobile phones. This project incorporated Agile-Scrum methods to develop a control and monitoring
system for a locally made avocado oil extraction machine that is powered by a solar system with
1600W panel arrays and 800Ah battery pack, and uses a Brushless Direct Current Motor coupled
with electric solenoid valve, relay modules and a controller unit assisting on the control process and
collecting crucial motor operation data such as voltage and current. The designed Mobile app ‘Blue’
acquire motor operation data from the Raspberry Pi via Bluetooth technology, delivering data to
cloud server for later analysis. Easing data acquisition in off grid areas when engineers, technicians
or operators have a physical access to the stations. It was concluded that this novel design would
provide an effective control and monitoring mechanism with an acceptance on reliability, usability
and effectiveness of up to 85.65% for a plethora of locally-made machinery that available in the
market which still uses the manual means of operation emphasizing ease of use and productivity,
thence joining hands with the global world on attaining some of the Sustainable Development
Goals
