A kit that will drive single external solenoid to "knock" on doors, tables or anything. A range of cadence available selectable by the prog button.Selected knocking cadence is saved even when power is removed.

Drive capability for many voltages and currents of solenoid available, low quiescent (standby) current if driven from 6V, suitable for running from batteries. provision for a cable and button to trigger knocking. A test button is provided for an easy test of the board and solenoid.

The kit comes with a programmed PIC12F675 microprocessor and all of the components for a working board except the Solenoid, this needs to be purchased separately, but any 12V solenoid of under 2A continuous draw should be ok more details are available in the resources.

It was initially made as my door bell, After scaring my postman for many years I've released the kit :)