Bats! HIIT

Bats! HIIT is a simple but useful High Intensity Interval Training timer for Android.

How to use Bats! HIIT

Workout structure

A HIIT workout with Bats! HIIT comprises a sequence of alternating rest (warm up/cool down) intervals and work blocks. For example, a workout with two workout blocks will look like

1. warm up
2. block #1
3. rest
4. block #2
5. cool down

Bats! HIIT always inserts rest intervals between blocks, and always includes a warm up and cool down interval.

The length of the rest interval is configurable. By default, it is 60 seconds.

Block structure

A block is a series of work/break interval pairs; each work interval has a corresponding break interval. For example, you might configure Bats! HIIT to include 4 work intervals per block, with a 50 second work interval and 10 second break. Such a block would take 4 minutes.

Audio and visual cues

Bats! HIIT always gives a warning consisting of 4 short chirps when you're about to transition to a new interval. Every work interval begins with a single high-pitched beep; break intervals begin with a descending, two-tone beep. Rest intervals do not have an initial beep.

During work intervals, your phone's screen will be green. In breaks, the screen will turn yellow. Rest is indicated by a red background. Your phone will also tell you how long is left in the present sub-interval and how many work/break pairs and blocks remain.

Screen lock

When you're exercising, you want to be able to see your progress without unlocking your screen. Bats! HIIT prevents your screen from turning off, though it does allow it to dim for power savings. This lets you know at a glance how you're doing.

Save/recall workout

You can save/recall/delete stored workouts. "Last workout" is automatically created whenever you do a workout, and is restored when the app is next started.

Pause workout

If Bats! HIIT loses focus during a workout, your workout will be paused and will resume when Bats! HIIT resumes.

Delay locked loop

To ensure that your workout is accurately timed, Bats! HIIT implements a feedback system called a delay-locked loop. Every second, when Bats! HIIT wakes up to update the timer readout, it measures how long it was actually asleep and adjusts future delay intervals to hit the target 1-second sleep interval. In practice, this reduces short-term timing errors from more than 5% to about 0.2%; since the error is integrated over the life of your workout, the overall accuracy is two to three orders of magnitude better than the short-term errors.

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Development environment

Requirements

• adb: used to synchronize the development environment with a device (mobile phone, tablet, etc...)
• sdk: a useful tool to easily install gradle versions
• gradle: used to build the application
• A text editor/processor

Install tools

• Follow this instructions to install adb.
• Follow this instructions to install sdk
• To install gradle simply type sdk install gradle 2.14.1 and type Y when the cli asks if you want to use it as the current sdk version. This project will only work with gradle version 2.14.1.
• Check the gradle version using gradle --version. It should be

Installing the application in a device

ADB connection

First let's synchronize the device usibg adb

• Type adb devices
• No device should appear unless you connected it by USB. In that case your device is now synchronized with your computer
• If you want to synchronize it using Wi-Fi you must first enable tcp connections.
• Type adb tcpip 5555 to start listening to connections
• Check that your phone and computer are connected to the same network
• Now check which is your device's IP address. This can be typically found in Settings -> System -> About the phone -> State -> IP address
• Let's assume your IP is 192.168.0.156, then type adb connect 192.168.0.156.
• The device should be connected. Check that out typing adb devices.

Using gradle

Gradle is a tool that we use to build the source code, run tests, release applications, and perform many other tasks.

To build the application we can just type:

• gradle installDebug

It will automatically install the application in your phone using adb, that'ß why we need to establish (synchronize) an adb connection first.

Check what other tasks can be performed:

• gradle tasks

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License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Copyright (c) 2013 Riad S. Wahby rsw@jfet.org kwantam@gmail.com