||Vehicle overheat voice indicator
A voice playback temperature sensor is provided including a temperature sensor situated within an engine of a vehicle and adapted to transmit at the output a voltage directly proportional to the temperature within the vehicle engine.The invention pertains to overheat indicators particularly to a new vehicle overheat voice indicator for providing verbal indication to the user on overheating(temperature crossing a set limit.)
SUMMARY AND WORKING
The purpose of this device is to provide a new vehicle overheat voice indicator apparatus which has many of the advantages of the overheat indicators and some added novel features. It comprises a temperature sensor situated within an engine of a vehicle which is adapted to transmit an output voltage directly proportional to the temperature within the engine of the vehicle. user control over the temperature is provided using a potentiometer. Its first terminal is connected to a constant voltage source and second terminal connected to ground.It has a third terminal where the potentiometer is adapted to supply a user selected, adjustable voltage.There is also an operational amplifier having a positive terminal input connected to the output of the temperature sensor and a negative terminal input connected to the third terminal of the potentiometer which provides an activation signal at the output according to the voltage at the positive terminal and the voltage at the negative terminal(functions as a comparator). a test switch is coupled between the constant voltage source and a resistor which is then grounded. Thus the the switch can transmit an activation signal on its closing. There is an OR gate having the first input connected to the output of the operational amplifier and the second input connected between the test switch and the resistor.It transmits the signal if either or both the inputs are active. A non-retriggerable monostable multivibrator is provided having an input connected to the output of the OR gate. On recieving the activation signal from the OR gate, the multivibrator transmits the signal to the output. a voice play back mechanism is connected between a speaker and the multivibrator which can recite a verbal warning via the speaker only during the receipt of the activation signal.
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