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Save Water With An Automatic Shower Timer

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Make your own automatic shower timer. via instructables

We’ve all been told to take 5 minute showers. However, do we really know how long our showers actually are?
Here’s a simple weekend project that is both fun and practical. This circuit uses an ATtiny85 chip that automatically starts a timer as soon as you close your shower door. When 5 minutes are up, a piezo speaker starts beeping to let you know that time is up. If you finish your shower early, the timer resets.

Project Materials

• ATtiny85
• 8-Pin IC Socket
• SPST or SPDT Limit Switch (also called Microswitch)
• 8 ohm Piezo Speaker
• Green LED
• Red LED
• LED Holder – 5mm (2x)
• 220 ohm Resistors (2x)
• Male and Female Header Pins
• Mini Solder-able Breadboard
• Stranded Hook-up Wire 22 AWG
• 2x AAA Battery Holder
• AAA Batteries (2x)
• Adhesive Velcro Strips
• Small Project Box or Enclosure
( Most of these materials can be purchased from Sparkfun Electronics )

Tools

• Soldering Iron
• Diagonal Cutters
• Rotary Tool (with drill bits)
• Screwdriver
• Multimeter

To program the Attiny, you will also need an Arduino and a few jumper wires, as well as the latest version of the Arduino IDE.

Full tutorial

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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Filed under: tutorials —
Tags: , , , — by Rebecca Houlihan

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