Explore the journey of building a platform for large-scale crowd monitoring and entertainment using wristbands in this GOTO London 2015 conference talk. Dive into the challenges of transitioning from software to custom-built low-cost hardware as Frank Lyaruu, CTO at Dexels, shares insights from the Sendrato startup experience. Learn about wristband technology, base station placement and synchronization, big data applications, crowd density analysis, and the production process. Discover the differences between software and hardware development, and understand how lean and agile methodologies can be applied to wearable technology projects. Gain valuable insights into power management, rugged design considerations, and the unique challenges of developing for music festivals and large events.