Maduka, N.C., Sarkinpawa, K.H. , Yusuf, Y. and Okoye, F.I. 2026. Microcontroller-Based Security Systems for Restricted Buildings: A Review of Existing Approaches and Research Gaps. International Journal of Science for Global Sustainability. 12, 3 (Oct. 2026), 289–296. DOI:https://doi.org/10.57233/ijsgs.v12i3.1186.