Abstract: An automatic light signaling bicycle communication system includes a wireless relay module, a light module, and an external master device. The wireless relay module includes a relay processing unit and a relay communication unit. The relay processing unit controls the relay communication unit to wirelessly communicate with the external master device according to a simplified network protocol. When the relay processing unit receives a brake command through the relay communication unit according to the simplified network layer protocol file, the relay processing unit generates a relay brake command and broadcasts the relay brake command to a light communication unit of the light module according to MAC protocol, allowing a light processing unit of the light module to light up a brake light automatically. The light module only requires a low cost RF receiver chip for receiving broadcasted commands, rather than requiring an expensive chip for handling network communications.

Abstract: A driving force acceleration calculation method is executed by a processing module; the driving force acceleration calculation method includes receiving a tilt sensing signal from the tilt sensing unit, a sensed angle and a sensed acceleration from the gravity sensing unit; determining whether the tilt sensing signal is an uphill signal or a downhill signal; when determining that the tilt sensing signal is the uphill signal, calculating a driving force acceleration as the sensed acceleration plus the gravitational acceleration component; when determining that the tilt sensing signal is the downhill signal, calculating the driving force acceleration as the sensed acceleration minus the gravitational acceleration component; outputting the driving force acceleration; the method is able to more accurately calculate the driving force acceleration of a bike, therefore better knowing whether the bike suddenly decelerates.

Abstract: The time and/or date display of a clock radio is settable remotely and automatically by a radio frequency information signal. The time and/or date display is initially set in manufacturing of the clock radio simultaneously to a plurality of clock radio units, and the display may also be adjusted with an adjusting radio frequency signal broadcast to a plurality of clock radio units simultaneously.