555timer

The Timer555Monostable library turns a 555 Timer IC connected in Monostable mode (see 555 Timer datasheet) into a Capacitance and/or Resistance meter. The library helps in the design of capacitive sensors which can detect touch or proximity by measuring a variation in an object or sensor Capacitance.

This is a relay-design with that can be switched with a momentary switch based on a 555-Timer.

Electronic Schematics