Light Alarm

I created a wirelessly controllable lamp for my bedside table. The lamp is a basic LED desk lamp. The negative terminal is connected to the collector of a bipolar-junction transistor. The emitter is grounded, and the base is connected to a GPIO pin of a NODEMCU microcontroller. The biasing is not perfect, but it works. When the controller writes high to the base of the emitter, it forces the BJT into saturation and allows current to flow through the lamp. When the controller writes low, the BJT is cutoff and allows no current to flow through the lamp. In addition, I wrote a function that switches the output pin several times to create a visual alarm. The NODEMCU also polls time.gov every 20 seconds to accurately keep time. These features synergize to form an alarm clock.