This thesis aims to address the issues mentioned above and to determine a step-by-step approach towards building an EH based IoT module for powering low-powered devices or IoT applications, specifically for small-scale users. In this regard, two energy harvesting sources, Solar and Heat/Thermal energy have been under investigations regarding power generation of specific EH module and to analyse whether these sources could lead to a promising solution and to sustain the powering capacity required by IoT components. Two prototypes for complete EHC setup for both sources have been proposed, and commercially available transducers have been selected for power generation. On the other hand, commercial-off-the-shelf (COTS) power management integrated circuit (PMIC) from Linear Technology; LTC3108 is chosen for a complete power management solution. The transformation of solar and heat energy will be converted into electrical analogy, as this study is entirely based on an electrical perspective. For solar power generation, the proposed EHC prototype has generated certain levels of power under various solar irradiation and temperature dependent conditions. The range varies between 2.68 mW (minimum generated power) till 108.60 mW (maximum generated power), specifically, under various solar irradiation levels and load configurations. Whereas, for the Thermal EHC prototype, there are two factors under analysis: power generation and performance analysis. In terms of power generation, there are two programmed output voltages (2.3 V, 3.3 V), and accordingly, the power has been generated.Consequently, this simulation-based analysis towards building an EH based IoT system could be used as a point of reference and provides an insight towards a fundamental step-by-step basis for developing any Solar or Thermal based IoT prototype for specific applications.