Car monitoring system is based on Dallas micro controller.It measures temperature ,liquid level,light level and distance.It measures temperature with DS1621 thermometer with I2C interface and shows value on LCD .Light sensor is LDR, when there is not enough light ,system write to you "turn light on " .You may choose by switch mesuarment distance (reverse drive) .System measures distance with ultrasound sensors.Also system measures accumulator voltage with I2C analog to digital converter PCF8591.
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