Wireless bike brake light

Abstract

This invention proposes a wireless bike brake light that can respond to braking when bikes are in motion. The invention employs a MEMS (micro electro mechanical system)-structured accelerometer chip as sensor to detect related signals. A control circuits unit processes the signals, and then sends appropriate brake light to following vehicles based. The features of the invention are that (1) It can provide extra security when serving as a brake light with independence of braking system, (2) It is easily to install and durable, (3) It can be also applied to such sports as skiing, skateboarding, etc. that are not equipped with apparent brake devices, and thus hard to incorporate brake lights.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 and FIG. 2 show an overview of this invention.

• • Unit 10 is an exemplary main body.
  • Unit 11 is an exemplary Body base.
  • Unit 12 is an exemplary transparent cover.
  • Unit 20 is an exemplary accelerometer.
  • Unit 30 is an exemplary control circuits.
  • Unit 31 is an exemplary micro-controller.
  • Unit 32 is an exemplary switch.
  • Unit 40 is an exemplary lighting device.
  • Unit 50 is an exemplary power.
  • Unit 60 is an exemplary fixing device.

FIG. 2 shows an overview of this invention.

FIG. 3 shows an overview of control of the preferred embodiment.

FIG. 4 shows the control flow of the preferred embodiment

• • 600—threshold setup
  • 602—turn on the power and select one among all regular lighting modes
  • 604—obtain after-low-pass-function signal from accelerometer
  • 606—first-level signal judgment (still/motion judgment)
  • 608—the bike is still, and control circuits unit outputs command signals as appropriate to the lighting device.
  • 610—second-level signal judgment (regular motion/deceleration judgment)
  • 612—the bike is in regular motion (acceleration or stable speed), and control circuits unit sends command signals as appropriate to the lighting device.
  • 614—the bike is in deceleration, and control circuits unit commands the lighting device to activate brake light

Claims

1. A wireless bike brake light comprising: a power; a lighting device that receives commands to give off lights at a mode as appropriate; an accelerometer that is MEMS-structured, chip-shaped and employed to detect linear deceleration conditions of a vehicle; a control circuits unit that is electrically connected to the said accelerometer, power and lighting device, and employed to process signals sent from the said accelerometer and then gives appropriate commands to the said lighting device; a main body that is hollow inside to contain at least the said accelerometer and the said control circuits unit; a fixing device that is used to fix the said main body on a bike; Its features mainly comprises: the said control circuits unit has a low-pass signal filtering function that filters high-frequency voltage signals coming from the said accelerometer, and can judge if the bike is still or in motion.

2. The wireless bike brake light of claim 1, wherein the said main body comprises a hallowed body base and a transparent cover.

3. The wireless bike brake light of claim 1, wherein the said control circuits unit comprises a micro-controller (MCU).

4. The wireless bike brake light of claim 1, wherein the said lighting device is light-emitting diode (LED).

5. The wireless bike brake light of claim 1, wherein the said control circuits unit has an auto power-off function when the applied bike stays still for a preset period of time.

6. The wireless bike brake light of claim 1, wherein the said control circuits unit sets at least one deceleration threshold that is used to compare with the accelerometer signal after low-pass filtering process, so as to determine if deceleration condition of the applied vehicle or object occurs and the proper lighting mode the said lighting device should give off.

7. The wireless bike brake light of claim 6, wherein the magnitude of the said deceleration threshold can be set manually by user or factory, and then remembered into the said micro-controller.

8. The wireless bike brake light of claim 7, wherein the setting of the said deceleration threshold is done through a switch.

9. The wireless bike brake light of claim 1, wherein the said fixing device is a bracket, a band or screws.