Showing posts with label bike. Show all posts
Showing posts with label bike. Show all posts
Thursday, July 4, 2013
Digital Bike Tachometer
This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of the wheel where permanent magnets pass by. The permanent magnets are attached to the wheelspokes and activate the reed switches everytime they pass by it. The speed is digitally displayed.
The tachometer circuit works according to this principle; the pulses created by the reed contacts are counted within a certain time interval. The resulting count is then displayed and represents the speed of the bike. Two 4026 ICs are used to count the pulses, decode the counter and control two 7-segment LED display. RS flip-flops U3 and U4 function as anti-bounce.
Electronic bicycle DIY tachometer Circuit diagram:
The pulses arrive at the counter’s input through gate U7. The measuring period is determined by monostable multivibrator U5/U6 and can be adjusted through potentiometer P1 so that the tacho can be calibrated. The circuit U1/U2 resets the counters.
Since batteries are used to power the circuit, it is not practical to support the continuous display of speed information. This circuit is not continuously active. The circuit is activated only after a button is pressed. At least three permanent magnets must be installed on the wheel. The circuit can be calibrated with the help of another pre-calibrated tachometer.
The tachometer circuit works according to this principle; the pulses created by the reed contacts are counted within a certain time interval. The resulting count is then displayed and represents the speed of the bike. Two 4026 ICs are used to count the pulses, decode the counter and control two 7-segment LED display. RS flip-flops U3 and U4 function as anti-bounce.
Electronic bicycle DIY tachometer Circuit diagram:
The pulses arrive at the counter’s input through gate U7. The measuring period is determined by monostable multivibrator U5/U6 and can be adjusted through potentiometer P1 so that the tacho can be calibrated. The circuit U1/U2 resets the counters.
Since batteries are used to power the circuit, it is not practical to support the continuous display of speed information. This circuit is not continuously active. The circuit is activated only after a button is pressed. At least three permanent magnets must be installed on the wheel. The circuit can be calibrated with the help of another pre-calibrated tachometer.
Wednesday, June 12, 2013
Bike LED Direction Indicators Lights
As the bike is not the same as turn signal of the car, the rider is usually the gesture inform rear vehicles and pedestrians when turning. But after all it is not obvious, sometimes it is easy to happen accidents.
For more security,The front cheap bike lights is not enough,the designer designed this backpack with a turn signal.The composition of entire system is that the wireless control device located on the handlebars and backpack with LED light. When you want to turn, simply press the button on the control, the eye-catching backpack will display turn directions by the LED light. In addition, when you brake or encountered an emergency situation, LED will display red lights to rear warn vehicles and pedestrians. This design won the 2010 Red Dot Award.
Read the rest entry[...]
For more security,The front cheap bike lights is not enough,the designer designed this backpack with a turn signal.The composition of entire system is that the wireless control device located on the handlebars and backpack with LED light. When you want to turn, simply press the button on the control, the eye-catching backpack will display turn directions by the LED light. In addition, when you brake or encountered an emergency situation, LED will display red lights to rear warn vehicles and pedestrians. This design won the 2010 Red Dot Award.
Subscribe to:
Posts (Atom)