Traditional bicycle computers (or trip counters) measure the rotation of the wheel by sensing when a magnet mounted on the wheel passes a reed switch (or similar) mounted on the fork. The sensor is wired (or has its own battery to transmit the data wirelessly) to a battery-powered embedded computer which records and displays statistics on the journey.
In this case study, we present a transiently-powered wireless cycle computer which measures distance, speed and active cycling time, and transmits data wirelessly. The system sustains operation by harvesting energy from the rotation of the wheel, operating from minimum speeds of 6kph.
- S.C.B. Wong, D. Balsamo and G.V. Merrett (2018) Demo abstract: An energy-driven wireless bicycle trip counter with zero energy storage At the 16th ACM Conference on Embedded Networked Sensor Systems (SenSys 2018), 04 - 07 Nov 2018.
- U. Senkans, D. Balsamo, T.D. Verykios and G.V. Merrett (2017) Applications of energy-driven and transient computing: a wireless bicycle trip counter At 15th ACM Conference on Embedded Networked Sensor Systems, Delft, Netherlands. 05 - 08 Nov 2017.
- U. Senkans, D. Balsamo, T.D. Verykios and G.V. Merrett (2017) Applications of energy-driven computing: a transiently-powered wireless cycle computer At 5th International Workshop on Energy Harvesting & Energy-Neutral Sensing Systems.