Light sensor circuit diagrams

This circuit give low level output, when exist enough lighting, that is a detector of light. It can give, say ,command turn on somebodies lights, when fall the dark. His exit is compatible with TTL... [more]

These two circuits use LDRs (Light Dependent Resistors). Circuit No.1 energizes the relay when the light rises above a preset level. Use it to switch things on at dawn. Circuit No.2 energizes the relay when... [more]