By employing thermoelectric modules to transform body heat into electrical power, the study explores energy harvesting from the human wrist. To increase the voltage received from the thermoelectric generator (TEG), a DC-DC proportional integrator (PI) or proportional integrator derivative (PID) buck-boost circuit must be created in MATLAB SIMULINK. Next, a printed circuit board (PCB) is used to build the proposed DC-DC converter. According to experimental findings, it is possible to increase the initial output voltage from body heat—roughly 300 mV—to 2.9 V, which is enough to power an LED. This study demonstrates how energy scavenging systems may power tiny, self-sufficient electronics, lowering reliance on batteries and offering sustainable, portable, and clean energy options. The research highlights the significance of self-powered systems like solar, wind, and fuel cells while also comparing wrist-based energy harvesting with alternative techniques, looking at potential future developments, and analyzing the uses of energy harvesting from the human body.