Dads, you too can enjoy that warm trickling feeling of a hot shower once again without rising at the crack of dawn. Necessity is the mother of invention, and in my house, with two teenage daughters, I had to end the curse of cold morning showers by building a shower timer that I installed on my hot-water tank.
An electrically operated ball valve is installed on the supply side of my hot water tank and paired with a water flowmeter. A small microcontroller device monitors the amount of time during which the water is passing through the tank. When the allotted time is reached, the valve is temporarily cycled off and on for a few seconds to warn the person taking a shower that her time is up.
For this project, I selected an Adafruit HUZZAH ESP8266 board, which is both cheap and packed with features that make it interesting to play with. First, it has WiFi capability, which allows it to be controlled remotely. This means that it can be initialized as an access point, which allows me to configure it to join a home network. Second, it can run a Web server to allow over-the-air updates: once the original wiring plan is installed, there is no further need to connect it through the USB port for updates. Third, it comes with a built-in voltage regulator, converting the 5V current from the power supply that drives the valve’s motor to a voltage that can be handled by the GPIO pins.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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