Many open data projects rely on volunteers spending time to gather data, e.g. from remotely placed sensor nodes that capture environmental parameters. Generally, the more data the better conclusions can be drawn. However, many projects suffer from having not enough volunteers and therefore collected data. This projects goal is to dramatically reduce the barrier for non-technical people to become volunteers. To achieve this goal, a serial communication via headphone socket will be established. With WebRTC the signals can be captured in a browser, making installation of addtional software unnecessary.