You want to build a heart with $50? Good luck with that! You want to build a physical model of the electrical activity of heart cells? Well that’s different. Here you go. The light from the LED acts like an action potential in the heart tissue, and the photo-resistor allows the cells to respond to changes in this potential.
Several research and education projects from the Medical Robotics Laboratory and Virtual Experiences Laboratory at The University of Georgia: Try out a fully immersive portable virtual reality system, a smart recycling bin, a mobile 3-D printing station, use a DaNI educational robotics platform.