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Heat Guardian Assistant

User's Guide

First Steps

Start by downloading and installing the Heat Guardian Assistant (HGA) from the Google Play Store. Have your two Heat Guardians fully charged and near at hand for the next steps.

0. Start the Assistant

When you first run HGA it will ask you to allow access and then it will note that you have no attached Heat Guardians.

1. Identify the Heat Guardians

First, turn on both Heat Guardians and let HGA find them and save their unique addresses. The identify screen will scan for the two

units and once they are found you will get a confirmation prompt. This should only need to be done once.

2. Update the Heat Guardians

We strongly recommend that you update your Heat Guardians. Make sure both units are fully charged. The Updater will step-by-step update both the Operating System (if necessary) and Application firmware in your units. Please let us know if the updater does not work correctly. At worst it should just fail to update.

3. Ensure everything is working.

Look at the words at the bottom of the screen. When a Bluetooth change is detected (usually every thirty seconds) the counter will show time since last Bluetooth connection of 0 and then it will start counting up.

At the top of the screen are three icons to show status for Temperature, Long Range Connection, and Bluetooth Connection. If they are all green then things are working totally.

The Assistant should connect to your Mobile unit (named HeatGuardian.RX). Check this by selecting Details in the Options menu. If it mistakenly connected to your Base you may swap connections in the Options menu.

Home Screen Display

The main (Home) screen has menus and a display of both the Base and Mobile Heat Guardian units. Each display shows the usual Temperature, Battery and Signal Level. The Mobile (bottom) display also shows the temperature range. 


Navigation Menu: use this to pick from different activities, such as Settings.

Options Menu: actions for the connected (Mobile) Heat Guardian.

Status Icons: these will change colors and indicators when things go bad, turning orange (warning) or red.

Signal: the signal bars show relative strength.

Battery: when this is empty the battery should be recharged.

Cold Alert: if the base gets colder than this an alert will sound on the mobile unit.

Hot Alert: if the base gets hotter than this an alert will sound on the mobile unit.

Time since... if you really care, these show (in seconds) how long since a connection was made

Temperature Limits

The Assistant lets you set minimum and maximum temperature limits. These limits are stored in the Heat Guardian unit, not the Android application, so you only need set them once and each unit may have its own remote limits. If the base temperature goes out of bounds (too hot or too cold) an alert sound will play on the mobile unit so you need not watch the units.

Detail Information

The detail information is mainly for so that we can provide you with the right technical support if something goes wrong.

Options Menu

The options menu has entries for the home screen options.

  • Details - show the local detailed information. Same as clicking the information icon.

  • Swap Units - swap local and remote units (HGA talks to the local unit). Use this if you've connected by mistake to the Heat Guardian that's going in your vehicle.

  • Identify Paired Unit - play a sound on the local unit. Same as clicking the speaker icon.

  • Options - Bring up Heat Guardian unit options, such as temperature limits and power output.

Temperature Alert Notification

The Heat Guardian Assistant has a notification wrapper that runs with the other Android notifiers. This stays running and connected to the Mobile unit even when the Assistant is not visible. If your remote Heat Guardian gets too hot the notifier will play an alert no matter what application is on top.

Disable the notifier to save phone battery if you want to disconnect from the Mobile unit when HGA is closed down.

Unit Options

The options are specific to each connected unit (usually this is the mobile unit). The temperature alerts live in the mobile unit and trigger when the base is too hot or cold.


Navigate to the settings page to change Heat Guardian Assistant settings, such as which tones to play when temperature is out of range. The most important of these settings is the "Show Notifications" setting.

When you turn on Show Notifications, a piece of the Assistant will keep running in the background - connected to your mobile unit. This lets you place the mobile unit in a purse or bag - out of sight - while the phone will pop up a warning if the temperature goes out of range.

Make sure you turn off notifications when you are finished using the Heat Guardians.


When things go wrong, or are uncertain, the icons at the top of the screen will show issues. See below.


Bluetooth not connected, Long Range searching, and Temperature too hot displays.


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