January 8, 2017 AT 4:00 am

Building a Shower Timer with an ESP8266

Douche 148769533
Thanks Phil for sending this in!
Phil says –

Here’s a common family problem. Adolescents will empty the hot water tank
by the time it’s dad’s turn to get into the shower in the morning. Every.
Single. Morning.

Screaming doesn’t help. Taking away TV privileges either. So what’s a dad to

Get a bigger tank?


Get a Huzzah and a couple of gizmos.

Mrshower 06

Via Spiria

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.

Working Principle

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.

Required Materials

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.

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1 Comment

  1. VERY challenging install unless you’re doing this in a new build home.

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