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.

1. Identify the Pair of 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 Pair of 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.

On the Home Screen at the top it will say SearchingConnecting, then Connected, and then (sometimes) Working. If it stays on Connecting or Searching then you have an issue. Sometimes turning the Bluetooth on your phone off then on will fix this. Don't forget that the range of Bluetooth is very small (feet).

If the display does say Connected or Working, and you see two valid temperatures (by default it shows 0) then click the little speaker icon in the Local display. This will play a short tune on the "Local" unit. You may swap local/remote by using the ... menu at the top right and selecting Swap Units.

In normal use, only one of the units will be nearby (Local). Both units are needed for step 2 (Identify) but after that HGA will automatically connect to the local unit.

Home Screen Display

The main (Home) screen has menus and a display of both the Local and Remote Heat Guardian units. Each display shows the usual Temperature, Battery and Signal Level. The Remote (top) display also shows the temperature range. The Local (bottom) display has two additional buttons - a sound and a help button. The sound button plays a sound on the Local unit so you can identify it easily. The help button shows more detailed information about the Local unit.

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

Options Menu: actions for the home screen.

Remote Signal: the signal can go from 0...100 but at 50 it is 5 bars since that is plenty of signal.

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


Cold Alert: if the remote gets colder than this an alert will sound.

Hot Alert: if the remote gets hotter than this an alert will sound.


Play Local Sound: play a sound on the local unit so you can identify it.

Details: show details for the local unit.

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 remote temperature goes out of bounds (too hot or too cold) an alert sound will play on your local 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.

  • Check for Updates - check the web for updates for the units. The assumption is that they have the same version, although it's not necessary. 

  • Set Limits - set minimum and maximum temperature range. Same as clicking the temperature range entries. When the temperature is out of range the units will glow red and play a tune.

  • Set Power - you may switch between standard power (17) and high power (22). High power has almost twice the range but at the cost of battery life.

Temperature Alerts

The Heat Guardian Assistant has a notification wrapper than runs with the other Android notifiers. This stays connected to the Local 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.

You can close the notifier (to save phone battery) if you want to disconnect from the Local unit when HGA is closed down. The notifier has a pull-down option that will show you the Hide Notification button.

© 2019 by Audua, LLC, makers of the Snug.Dog Heat Guardian