metr-guide

[STATUS: IN PROGRESS]

Metr App is probablyโ„ข๏ธ the most advanced telemetry app for electric skateboards. As amount of features continued to grow over the years the time has come for the proper guide to explain the basics and some hidden secrets in the app.

This guide will be improving over time and hopefully some day will cover everything the app has to offer. Before you start reading there are two very important things you need to know. In order to use it you must have:

If your skateboard has another controller, the app will not work for you. For example Boosted, Evolve, Mellow, Meepo, WowGo, Backfire have another type of controller and are not compatible.

Contents

๐Ÿฃ First time setup
โš™๏ธ Metr Pro firmware
๐Ÿ“ˆ Realtime
๐ŸŒ Modes
โบ Records
๐Ÿ‘ค Account
๐Ÿ›‘ Faults
๐ŸŽ“ Expert
โšก๏ธ Discharger
๐Ÿ“ฃ Announcements
โš™๏ธ Settings
๐ŸŒ‰ TCP Bridge
๐Ÿ”ข Overlay
๐Ÿ”‹ DieBieMS
๐Ÿ”‹ FlexiBMS
๐Ÿ”‹ LLT BMS
๐Ÿ›  Troubleshooting

Frequent issues

Location not recorded

๐Ÿฃ First time setup

Follow the instructions at metr.at/setup

โš™๏ธ Metr Pro firmware

In order to use all applications latest features it is important that your Metr Pro has the latest firmware. You can check it by going to Settings and clicking on the blue gear near the module name.

Click Upgrade and wait until firmware update over BLE is complete.

๐Ÿ“ˆ Realtime

Shows values such as voltage, current, temperature from your VESC at any given time. Each value is displayed in itโ€™s own cell. Following cells are available:

It is possible to arrange/show/hide/resize/recolour cells:

There is an indicator in the bottom which shows currently selected BLE module and connection status, ESC hardware name and firmware version. It blinks every time new packet from VESC is received.

There are 2 Realtime screens available. You can customize any of them.

You can click on small watch icons to select which data will be displayed on the smart watch. Apple watchOS and Android Wear is supported. You can select up to 4 cells.

๐ŸŒ Modes

You can setup a number of modes (profiles) to change max speed, acceleration and braking power. The recommended way to create a new mode is to read existing config from VESC and then change values.

To apply a mode, swipe it to the right. The mode will be automatically applied to all VESCs connected via CAN bus

To rename a mode, open it and click on the name

You can also share modes

โบ Records

Records can be started and stopped automatically (configurable in Settings โ†’ Records). If the app is running in the background it will automatically detect selected BLE module, connect to it and start a new record.

To export raw JSON data open your record in the browser and add ?format=json in the address bar.

JSON data format:

{
  "ah":0.49,                         // Total charge consumed, Ah
  "ahRegen":0.02,                    // Total regen-braking charge, Ah
  "altitude":[0,0,-0.1,-0.2],        // Relative altitude change, m
  "appver":"4.6.10",                 // Metr app version
  "consumption":[11.2,11.3,11,10.5], // Consumption, Wh/km
  "current":[-0.02,0.92,2.46,2.38],  // Battery current, A
  "current2":[],                     // Battery current ESC#2, A
  "current3":[],                     // Battery current ESC#3, A
  "current4":[],                     // Battery current ESC#4, A
  "description":"",                  // Long record description, text
  "distance":2353.07,                // Total covered distance, m
  "duration":430471,                 // Total duration, ms
  "duty":[23.7,25.6,25.5,25.7],      // Duty cycle, %
  "elapsed":[359,683,877,1346],      // Time, ms
  "elapsedAh":[0,0.01,0.02,0.02],    // Charge consumed, Ah
  "elapsedAhRegen":[0,0,0,0],        // Regen braking change, Ah
  "elapsedDistance":[0,0,0.5,1.9],   // Covered distance, m
  "elapsedWh":[0,0,0.1,0.1],         // Spent energy, Wh
  "elapsedWhRegen":[0,0,0,0],        // Regen-brakign energy, Wh
  "end":1602758871101,               // Record end timestamp, ms since Epoch
  "escCount":1,                      // ESC count
  "faultCode":[0,0,0,0],             // ESC fault code
  "faultsCount":0,                   // Number of ESC faults
  "fw":"23.46 UNITY",                // ESC firmware
  "latitude":[59.29341,59.29341],    // Latitude, degrees
  "longitude":[18.00459,18.00459],   // Longitude, degrees
  "motorCount":2,                    // Number of motors
  "motorCurrent":[0,1.99,5.7,5.4],   // Motor current, A
  "motorCurrent2":[0,1.6,5.57,5.57], // Motor#2 current, A
  "motorCurrent3":[],                // Motor#3 current, A
  "motorCurrent4":[],                // Motor#4 current, A
  "motorTemperature":[23,23,23,23],  // Motor temperature, C
  "motorTemperature2":[24,24,24,24], // Motor#2 temperature, C
  "motorTemperature3":[],            // Motor#3 temperature, C
  "motorTemperature4":[],            // Motor#4 temperature, C
  "rpm":[16007,16019,16038,15999],   // ESC rpm
  "speed":[16.08,16.09,16.11,16.07], // Speed, km/h
  "start":1602758440630,             // Record start timestamp, ms since Epoch
  "temperature":[26.7,26.7,26.7,26], // ESC temperature, C
  "temperature2":[],                 // ESC#2 temperature, C
  "temperature3":[],                 // ESC#3 temperature, C
  "temperature4":[],                 // ESC#4 temperature, C
  "title":"bad weather,              // Record short description, text
  "version":18,                      // Record format version
  "voltage":[49.1,49,48.8,48.8]      // Voltage, V
}

๐Ÿ‘ค Account

You can sign in to your account at https://metr.at/account and view stats and all records for currently selected Metr Pro module. The sign in is done using public key cryptography instead of a password. You need to have active connection to Metr Pro in order to sign in.

๐Ÿ›‘ Faults

All faults that happen to VESC while itโ€™s connected to the app are recorded and can be seen in a separate tab

๐ŸŽ“ Expert

Expert is for expert use only. It allowes to change and tweak all possible configuration parameters on VESC. Both motor configuration and app configuration. It automatically detects all VESCs connected via CAN bus so you can switch between them and change settings. There is a super convenient omnibox to easily search what you want to change

It is also possible to do motor detection (both BLDC and FOC) in Expert. Click menu โ†’ Detect motor

Metr app fetches motor and app configuration every time connection is made with Metr Pro and saves a backup. To check history of changes click menu โ†’ History.

For DieBieMS / FlexiBMS too!

โšก๏ธ Discharger

You want to discharge battery pack in some cases, for example before winter. Storing battery discharged will increase its longevity. Sometimes you think about it too late and the weather is already bad to discharge the normal way. Fortunately there is a feature in metr app to help with that. To use discharger, open Expert tab, click menu โ†’ Discharger

It uses foc_openloop command to discharge battery. Battery current goes through motors, but they are not spinning, just heating.

โฑ Takes several hours to discharge a battery
๐ŸŒฑ Quiet and about 5x faster than freespin
๐Ÿ”ข Uses multiple VESCs/motors over CAN bus
๐Ÿ“ˆ Continuously sends COMM_ALIVE packets and monitors realtime data
๐Ÿ”ฅ Motor temperature limit 60โ„ƒ, VESC temperature limit 70โ„ƒ
โœ… Turns off when reached storage level

๐Ÿ“ฃ Announcements

Announcements is a very useful feature that literally tells you realtime data without you having to look at it.

You can customize which kind of data you want to hear and how often.

โš™๏ธ Settings

Very importaint, make sure motor settings are configured correctly

It is recommended to enable Location

and Notifications

To switch between metric and imperial go to Settings โ†’ Miscellaneous

And when viewing a record in a browser

๐ŸŒ‰ TCP Bridge

Connect to Metr Pro and start TCP Bridge from Settings tab

Then open VESC Tool and use the same IP address

๐Ÿ”ข Overlay

An easy way to add telemetry to your videos. You can film the video with the camera of your choice and record the telemetry data separately with the metr app. Then you combine them together.

Get GARMIN VIRBยฎ Edit
Open your record in the browser and add ?format=fit in the address bar. Wait until telemetry file is downloaded

Start GARMIN VIRBยฎ Edit and import your video
Click Import G-Metrix and use the .fit file that you downloaded

๐Ÿ”‹ DieBieMS

DieBieMS is a smart BMS (Battery Management System). If you have DieBieMS connected via CAN bus it will be automatically detected in the Metr App (no extra setup is needed). DieBieMS provides such information as individual cell voltages and state of charge / discharge, consumption based battery percent data.

To see individual cell voltages, click Battery percent cell on the Realtime page.

When you plug in the charger, DieBieMS view will automatically open and show charging current / balancing state. Glowing dots on the cells mean they are balancing at the moment.

It is possible to configure DieBieMS through the Metr App. When you open Expert page, DieBieMS shows up and you can read / write settings. This is a quick and convenient way to change some settings when you are on the go and donโ€™t have access to full DieBieMS Tool.

๐Ÿ”‹ FlexiBMS

FlexiBMS is similar to DieBieMS except it is a charge-only BMS. Please read the previous section DieBieMS.

๐Ÿ”‹ LLT BMS

LLT BMS comes with itโ€™s own BLE module instead of CAN bus. It is possible to pair Metr Pro with LLT BMS using following steps:

๐Ÿ›  Troubleshooting

A good advice is to search for information on esk8.news forum and esk8.builders forum. Maybe you will find the solution.

If you didnโ€™t find anything relevant, could be that you found a bug! The bugs are always there๐Ÿ› and once in a while a new one pops out. If you want to report it, please collect the log file from the app. Open Settings and click on โ€œShow Logsโ€ button. Send log file toghether with the bug description, screenshots or video. Log file resets every day so donโ€™t forget to collect it after you experienced the problem.


Location not recorded

iOS: make sure access to location is Always allowed

Android: make sure location permission is granted, location services are on, notifications are enabled and you have foreground notification on the lock screen




This guide is written in Markdown and is available at

GitHub (contributions welcome)
forum.esk8.news (ask your questions here)