Onuiri, Ernest, Nissi Madu, Boluwatife Adeagbo, Iniobong Johnson, and Oludele Awodele. 2014. “Design and Construction of a Microcontroller-Based Heartbeat Monitoring Device With Display”. International Journal of Engineering and Technology 3 (2): 279-89. https://doi.org/10.14419/ijet.v3i2.2342.