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Car speed detection device - Door lock is easy to forget. Even if it does
not lock there is seldom case the door opens during travelling. Even with, when
you are getting a child, the child plays and may open the door..(added 04/05/06)
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Car Tachometer - A 555 is configured as a monostable or one shot in this
project. The period of the 555 is determined by the 47k and the capacitor from pin 6
to ground (100n). Time "T" = 1.1 RC or 1.1 X 50,000 X 0.1 X10 -6 =
0.0055 or 5.5 mS (milli-seconds).... |
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Car Temperature Gauge - The Car Temperature Gauge is basically the same
circuit as March's project with some minor changes to the input circuit. This
circuit will display the water temperature to 1 degree resolution.…. [Designed by
Randy Linscott] |
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Car Voltage Gauge - The Car Voltage Gauge is based on 3 parts. The input
circuit is an Analog to Digital Converter (IC2 CA3162E). The purpose of this chip is
to sample an analog voltage and convert it to a decimal value which is read by a
Display/Decoder Driver (IC1 CA3161E). This chip will turn each seven segment
display … [Designed by Randy Linscott] |
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Car Window Closer - This circuit automatically rolls up a car’s electric
windows when it rains. The windows are rolled up one at a time while system
monitors window motor current. When motor stalls, system moves to
next window and shuts off it’s last window…. [Designed by Andrew R. Morris] |
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Central Junction Box - (application / block diagram added 6/07) |
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Charge Monitor for 12V lead acid battery. - A battery is a vital element of
any battery-backed system. In many cases battery is more expensive than
system it is backing up. Hence we need to adopt all practical measures to conserve
battery life. As per manufacturer's data sheets, a 12V rechargeable lead-acid battery
should be operated within 10. IV and 13.8V. When battery charges higher than
13.8V … (added 10/05) |
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Charging & Power Management - (application / block diagram added 6/07)
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Check Engine Beeper - When wired into a car’s indicator light panel, this
circuit will turn on a loud beeper when the “check engine” light turns on.... [Hobby
Corner Circuit by Dave Johnson] |
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