Tardis Power on a circuit when the lights are on Power off a circuit when the lights are off can be a good way to decrease power consumption.
Tardis LED pulse with NE555 The NE555 timer is quite cheap and using it is quite different than the usual micro-controllers. Pulsing a LED is a good way to begin with.
Tardis Audio player [2]: Tardis tissue box cover It's time to build the connected Tardis! Sound, lights, and tissue box in one beautiful (?) object!
ESP8266 Audio player [1]: Concept and first circuit A real IoT device, WiFi enabled, connected to a MQTT server which can play sound on demand!
![Audio player [2]: Tardis tissue box cover](/content/images/size/w600/2017/08/IMG_20161225_203719.jpg)
![Audio player [1]: Concept and first circuit](/content/images/size/w600/2017/08/IMG_20160511_082710-1-.jpg)