Apple Watch

Apple Watch¶

LoopFollow includes an Apple Watch app. It shows the same glucose information as the LoopFollow app on your iPhone, adds glucose to your watch face, and can send remote commands to Loop or Trio.

Normally the watch gets everything from LoopFollow on the paired iPhone. When the iPhone is switched off or out of reach, the watch keeps working on its own over Wi-Fi or cellular, see Without the iPhone.

Install the Watch App¶

The watch app comes with LoopFollow. If it does not appear on your watch after you install or update LoopFollow, open the Watch app on your iPhone, scroll to Available Apps and tap Install next to LoopFollow.

Open the watch app once while the iPhone is nearby, so it can receive what it needs to work without the iPhone. Until the iPhone has sent its first data, the watch shows Waiting for LoopFollow on iPhone.

Using the Watch App¶

Turn the Digital Crown, or swipe up and down, to move between the pages: Glucose, Graph, Statistics and Info.

Glucose¶

Following Loop (mg/dL)	Following Trio (mmol/L)

• The latest glucose value with its trend arrow and the change since the previous reading
  • Colors follow the LoopFollow settings on your iPhone: green in range, yellow high, red low, or white when Color BG Text is off
  • The value is struck through when the latest reading is 12 minutes old or more
• Under the change: insulin on board (IOB, syringe symbol) and carbs on board (COB, fork and knife symbol)
  • Not looping is shown in red in place of IOB and COB when the loop has not reported for 15 minutes
• The running override, in green, with its name and insulin needs, for example Exercise · 80 %
• Top right: minutes since the latest reading, shown in red when the reading is 12 minutes old or more
  • An orange iPhone symbol means the watch cannot reach the iPhone right now
  • A blue watch symbol means the watch is fetching the data itself
• A graph of the last two hours
• Buttons for remote commands at the bottom, see Remote Commands

When an alarm is sounding on the iPhone, its name is shown at the top of the page. Tap it to snooze the alarm on the iPhone. The watch app has no alarms of its own.

When you lower your wrist and the screen dims, only the glucose value and the minutes since the reading stay on the screen.

Graph¶

Following Loop	Following Trio	Looking back in time

The graph shows readings, boluses (blue triangles), carbs (orange dots), the high and low lines and the prediction in the same colors as the iPhone. Overrides are shown as a thin green band along the top, and the running override is named under the graph.

• Tap the button in the top corner to switch between 1, 3, 6, 12 and 24 hours. The graph starts at 3 hours.
• Tap the graph to look back in time. The graph opens on a screen of its own, where the Digital Crown moves the marker back in 5-minute steps, up to 24 hours. Below the graph you see the time at the marker, the glucose with a dot in its range color, and any carbs and bolus at that time, followed by the override that was running then. Tap the graph or go back to return.

Statistics¶

The same statistics as under the graph on the iPhone: time low, in range and high, average glucose, GMI or estimated A1C, and standard deviation. They cover the same period as on the iPhone: the last 24 hours, or today since midnight, as chosen with Stats Period in Settings: General.

When the watch is fetching on its own, an orange line shows the time of the iPhone's latest statistics, for example From the iPhone at 14:05.

Info¶

The iPhone info table: the same rows, in the same order, with the same colors as set up in Info Display on the iPhone.

Complications¶

You can add LoopFollow to your watch face. Edit the watch face, choose a complication slot and pick LoopFollow. All sizes show glucose, trend and the minutes since the reading. The rectangular, corner and inline sizes also show the change since the previous reading, and the rectangular size adds a two-hour graph.

watchOS decides how often complications refresh, so a complication can lag behind the watch app. Always check the minutes shown next to the value.

Remote Commands¶

The buttons on the glucose page send the same commands as the LoopFollow remote screens on the iPhone. They appear when Loop Remote Control or Trio Remote Control is set up in LoopFollow.

The Overrides button turns green while an override is running, and the Temp Target button turns green while a temp target is running. The buttons are grayed out when the watch can neither reach the iPhone nor send the command on its own.

Bolus¶

Set the amount	Confirm with the Digital Crown

The bolus screen opens on the amount. Set it with the Digital Crown, or with the − and + buttons beside the amount. Each click changes the amount by one bolus increment, up to the Max Bolus in LoopFollow. Tap Continue to confirm.

Starting at the recommendation

• A recommendation is only used when no manual bolus has been given since the loop cycle that calculated it. That recommendation does not count the newer bolus, so using it could double the insulin. The next loop cycle makes a new one.
• When the recommendation from Loop or Trio is less than 5 minutes old, the amount starts there, rounded down to the bolus increment. The line under the amount shows the recommendation and how old it is, and turns red at 5 minutes.
• Until you change the amount yourself, the watch keeps it in line with new loop cycles:
  • A lower recommendation replaces the amount, and the watch taps your wrist.
  • A higher recommendation is never filled in by itself. The line changes to New 1.6 U, tap to use and the watch taps your wrist. Tap the line to use it.
  • When nothing was filled in as the screen opened, a new recommendation is offered the same way, with a tap.
• Once you change the amount yourself, it stays as you set it.
• If the amount is still the recommendation when you tap Continue, you are warned when the recommendation is 5 minutes old or more, the same as on the iPhone. At 12 minutes or more, the amount is cleared and you set it again.

Presets

Tap Presets, under Continue, for your LoopFollow Quick-Pick boluses. The recommendation is also listed there when it is 5 to 12 minutes old, with the same warning. The button is only shown when there is something to list.

Confirming

• When the amount came from the recommendation, the confirmation shows Recommended and how old it is.
• If a new loop cycle lowers the recommendation while the confirmation is open, nothing is sent when you turn the crown. The watch shows Recommendation Lowered instead, where you can change to the new amount (then turn the crown again to send it), send the original amount anyway, or cancel.

Meal¶

• The rows at the top are your LoopFollow Quick-Pick meals. Tap one to go straight to the confirmation, logged now.
• Tap Carbs and set the amount with the Digital Crown, or with the − and + buttons beside the amount. Until you tap a field, the Digital Crown scrolls the screen.
• For Trio, the same fields as on the iPhone follow below carbs: fat and protein when Meal with Fat/Protein is turned on, and a bolus when Meal with Bolus is turned on in the LoopFollow Remote Settings. Carbs and bolus are sent together as one command.
• Tap Time to log the meal from 2 hours ago to 1 hour ahead. A bolus sent with the meal is given right away, also when the meal is set to another time.
• For Loop, the watch sends carbs only, with an absorption time of 3 hours.

Safety Checks¶

• Anything that delivers insulin needs a full turn of the Digital Crown to confirm. A partial turn starts over after a 3-second pause, so an accidental bump of the crown never adds up to a confirmation. The watch must have a passcode, Wrist Detection must be on, and the watch must be unlocked on your wrist.
• Commands without insulin, such as carbs only, overrides and temp targets, are sent with a Send button.
• Every command is checked against the same limits as the iPhone remote screens, such as Max Bolus and Max Carbs, before it is sent.
• Commands are never saved to send later, and a command that arrives more than 60 seconds after it was made is ignored.

After Sending¶

Sent means the command has been sent. It does not mean that Loop or Trio has acted on it. Wait for the notification from Loop or Trio that confirms the result, the same as when you send a command from the iPhone. The watch returns to the glucose page after a few seconds.

The result usually shows on the watch within a minute or two: after a command, the iPhone checks Nightscout several times during the first 2 minutes, and the watch does the same after a command it sent on its own.

If something goes wrong, the watch shows the reason and stays on that screen until you tap OK. If the iPhone does not answer within 30 seconds, the watch says that the command may still have been sent: check Loop or Trio before you try again.

Turn Off Watch Commands¶

Remote commands from the watch are on by default. To turn them off, open LoopFollow on the iPhone, go to Remote Settings and turn off Allow Commands from Apple Watch. The watch then shows glucose information only, and the details it needs to send commands on its own are not copied to the watch.

Without the iPhone¶

The watch normally gets its data and sends its commands through the iPhone. When the iPhone is switched off or out of reach, the watch carries on by itself:

• Data: when the iPhone has not sent anything for 10 minutes, the watch fetches glucose, IOB, COB, the prediction and treatments directly from Nightscout, or glucose from Dexcom Share if you do not use Nightscout. A blue watch symbol next to the minutes shows that the watch is fetching on its own. Statistics and the info table keep showing the iPhone's latest values, with the time they are from.
• Commands: when the iPhone is out of reach, the watch sends the command directly to Loop or Trio, checked against the limits it last received from the iPhone. The confirmation from Loop or Trio still goes to the iPhone. The watch checks Nightscout itself 10, 20, 40 and 60 seconds after the command and shows the result once it appears there. If it does not show, check Loop or Trio before you try again. Insulin can be sent from the watch alone at most once a minute.
• Snoozing an alarm needs the iPhone.

As soon as the iPhone is back, the watch switches back to it.