This 80's Hands On Electronics circuit automatically switches from high light to low light when an oncoming car illuminates the sensor. The circuit is powered by the car's own battery.
This circuit, with printed circuit board included, is from a Radio Electronics magazine from July...
In the figure we show how to excite a CMOS port by interrupting light on a Darlington...
We found this circuit in an old documentation, but it uses components that are still common in our...