How can flowing water be turned into electricity through a hands-on learning experience? H-HOPE’s latest infographic introduces the process of designing, building and testing a DIY energy harvester, taking readers from the science of vortex-induced vibration to electrical output.
Presented across two pages, the infographic outlines six practical steps that connect flow conditions, component manufacturing, mechanical assembly and electrical testing. It brings together the principles behind the technology and the practical skills needed to explore it.
The first page, “From vortex shedding to site data”, introduces how vortices forming around a cylinder create alternating forces that can make it oscillate. Under suitable conditions, the energy of this motion can be harvested. Readers are then guided towards manufacturing DIY components using 3D printing and assembling a current meter, with Arduino code, to measure local stream conditions.
Measuring flow velocity is an essential part of the process. It helps users assess whether the harvester can operate close to its resonance range and understand what performance they might expect before progressing with their design.
The second page, “From mechanical motion to electric output”, focuses on assembling and testing the harvester. It covers building the frame and oscillating cylinder, installing the shaft, bearings and transmission, and assembling the induction generator that converts motion into electricity. The final step brings together wiring, electrical checks and testing in water to confirm a small power output.
Throughout the workflow, the infographic highlights the factors that influence performance, including flow velocity, cylinder dimensions, oscillation amplitude and resonance tuning. Links at each stage direct readers to supporting resources.
Alongside introducing energy harvesting, the workflow offers an opportunity to develop practical skills in fabrication, soldering, measurement and testing. By connecting scientific concepts with a working device, it encourages a deeper understanding of sustainable energy technologies through experimentation.
Explore the new infographic and follow H-HOPE’s DIY journey from flowing water to electrical generation.
