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EKE Tracker BV
Setting up is not hard. Take your time and follow along.
EKE TRACKER BV · EKE DONGLE B
EKE Tracker
User Guide
Model EKE-B-TRK-V · EKE-B-DNG
Setup
Getting started
The six trackers and the dongle are packed in the docking station.
-
Install the SlimeVR server
On the official SlimeVR download page, select Windows under Desktop and install the server. To install through Steam, choose the separate Steam option.
If you use SteamVR, please launch SteamVR once before installing the SlimeVR server.
-
Connect the docking station to your PC
Connect the port on the back of the docking station to your PC with the supplied USB cable. The dongle sits in the narrow slot at the right end of the dock, and you can leave it there.
We recommend placing the docking station at least 1.5 m away from the PC case.
Setting up the SlimeVR server
The setup wizard opens when you first launch SlimeVR Server. Choose your language at the bottom right, then press Let's get set up!.
At What type of trackers are you connecting?, select Dongle-based Slime under Third-party or DIY Trackers.
On Trackers using a dongle, press I connected all my trackers.
In the confirmation dialog, press I have connected all my trackers on the right.
-
Assign trackers to body parts
For a 6-point setup, select x6 Core Set. Then select each point on the body diagram and tap the corresponding tracker twice to assign it. Assign the chest, hip, both thighs and both ankles. You can also pick a tracker from the list.
If a tracker is missing from the list, hold its function button for two seconds, then release it.
-
Set the mounting orientation
Put on the trackers, then select Automatic mounting. Stand upright, press Full Reset and hold the pose for three seconds; then take a ski pose, press Mounting Calibration and hold for another three seconds.
On the next screen, press I have all my trackers on. Then use the two calibration buttons shown below in order.
See Mounting Calibration for the ski pose.
-
Check your height and proportions
On What is your height?, adjust the number to your actual height and select Continue and save. If your headset and controllers are connected, you can also calculate your height automatically. Fine tune body proportions later if the pose looks unnatural.
-
Enable SlimeVR in SteamVR
Start the SlimeVR server before you launch a game. The trackers reach SteamVR only while the server is running.
To avoid starting it by hand every time, open SteamVR settings, go to Startup/Shutdown and turn on SlimeVR under Manage Add-ons. SteamVR then starts the server with it.
Which body parts go to SteamVR is set per part under SteamVR in the SlimeVR settings.
If you cannot find the menu, start the SlimeVR server yourself, or leave it running and launch SteamVR afterwards.
Pairing again
Trackers bought as a set are already paired with the dongle. You only need the steps below if you bought an extra tracker or the pairing was lost.
Hold the dongle button for 5 seconds
The blue indicator starts blinking once per second, which means pairing mode is active.
Hold the tracker button for 5 seconds as well
Release once the red and blue indicators blink together twice. The blue indicator then blinks quickly while the tracker looks for the dongle.
Check that it connected
On success the tracker lights red and blue together for 2 seconds, and the dongle blinks blue twice.
Repeat step 2 for each additional tracker. When you are finished, hold the dongle button for 5 seconds again to leave pairing mode.
Please do not charge outdoors in winter, inside a car, or near a heater. If the product has been somewhere cold, leave it indoors for about 30 minutes before charging. Read all safety instructions
Safety
Safety instructions
Ignoring these can lead to fire, burns or damage to the product.
- Charge only indoors, between 0 and 45 °C. Do not charge outdoors in winter, inside a car, near a heater, or in a car in summer.
- If the product has been somewhere cold, leave it indoors for about 30 minutes before charging.
- Stop using the product immediately if it becomes hot or the battery swells while charging.
- Do not disassemble or modify the product. There is a battery inside.
- Do not put the product in fire or submerge it in water.
- Charge from a PC USB port or an ordinary 5 V USB charger. Do not use a fast charger.
- Do not leave the product in a car in summer, on top of a heater, or on a sunny windowsill. The case can deform and battery life will shorten.
- Do not sleep while wearing the product with a heater running.
- This product is intended for users aged 14 and over.
In the box
What is in the box
| Trackers | 6 (packed in the docking station) |
|---|---|
| Dongle | 1 (right-hand slot of the docking station) |
| Docking station | 1 |
| USB C to A cable | 1 |
| Straps | 2 each in large, medium and small (large for chest and waist, medium for thighs, small for ankles) |
| Hook-and-loop tape | 6 |
| Placement sticker | 1 |
| User manual | 1 |
A charger is not included. Please use a PC USB port or a standard 5 V USB charger. If anything is missing, contact the shop you bought it from.
Parts
Part names
Wherever this guide says function button, it means that single button.
Docking station
Push trackers and the dongle straight down until they stop.
Anything that needs a direct USB connection cannot be done through the dock.
Button
Button controls
What the button does depends on how long you hold it. While you hold it, the indicator tells you which step you have reached by blinking once, twice or three times, and the function runs the moment you let go. If you pass the step you wanted, just keep holding.
Tracker
| Short press | Shows the battery level on the indicator |
|---|---|
| 2 seconds | Turns the tracker on or off |
| 5 seconds | Turns pairing mode on and off. Hold for 5 seconds again to leave it |
| 8 seconds | Starts USB update mode |
| 15 seconds | Forces a restart. Nothing is erased, so this is also how you back out of a mode you entered by mistake |
Dongle
| 5 seconds | Turns pairing mode on and off. Hold for 5 seconds again to leave it |
|---|---|
| 8 seconds | Starts USB update mode |
Indicator
Indicator lights
No light at all is the normal state.
Tracker
Tracker · battery level (after one short press)
Dongle
Power
Charging and power
Charging
- Charging starts when you seat a tracker in the docking station or plug in a USB-C cable.
- While charging, the red indicator fades in and out continuously. This is normal.
- When charging finishes, the blue indicator stays on faintly.
- A full charge from empty takes about 2 hours.
Battery life
Used 2 to 3 hours a day, one charge lasts about 5 to 7 days. Left running continuously, it lasts up to 48 hours.* To check the remaining level, press the function button once.
* Measured in testing. The actual figure varies with how the product is used.
Power saving
A tracker goes into power saving when it has been left alone for a while. Moving it wakes it up, so leave the trackers in the dock instead of turning them off.
Turning off and on
Turning off is meant for travel or long storage.
- To turn off, hold the function button for 2 seconds while the tracker is on, then release. Red blinks three times as it shuts down.
- To turn on, hold the function button for 2 seconds and release. Blue blinks three times. A short press will not turn it on.
- A tracker switched off with the button will not wake on movement. Hold the function button for 2 seconds again, or connect USB.
A battery left fully discharged for a long time may not accept a charge again.
Wearing
Where to wear them
The set is a 6-point configuration: one on the chest, one on the waist, one on each thigh and one on each ankle. With extra trackers and straps you can also run an 8-point or 10-point configuration.
Chest · 1 tracker · large strap
Middle or lower chest
Wear it on the middle or lower part of the chest with the tracker facing forward. Depending on your clothing and build, the back may be more comfortable.
Waist · 1 tracker · large strap
Navel height, above the hip bone
Wear it around navel height, above the hip bone. The tracker can face forward or to the side.
Check that the tracker moves with you when you bend forward.
Thighs · 2 trackers · medium straps
Thigh, just above the knee
Wear it on the thigh just above the knee, or a little higher depending on your build.
Check that the tracker follows the movement when you bend your knee. Avoid areas that change shape a lot as the muscle moves.
Ankles · 2 trackers · small straps
Outer side of the ankle
Wear it on the ankle. The direction does not matter, but the outer side works better than the front.
Feet · 2 trackers · 8-point and above
On top of the foot
Sit the tracker on top of the foot, with its top edge pointing towards the ankle and its front face towards the ceiling.
If you wear foot trackers, run Feet Calibration once.
Elbows · 2 trackers · 10-point
Just above the elbow
Wear it just above the elbow. Put it on the outer side or the back of the arm rather than the front, where the bicep is.
Attaching the tape
Stick one piece of hook-and-loop tape onto the whole underside of each tracker. You only do this once.
Putting them on
Fasten the strap
Tighten it just enough that it will not slide down. If it is loose the movement can read wrong, or the tracker can slide off.
Attach the tracker
Press it onto the strap. The exact position can vary a little, but it must be the same body part you assigned in the SlimeVR server.
Where possible, attaching to bare skin rather than over clothing slides less.
Reset
Resets
The SlimeVR server has three of these.
Full Reset
Press Full Reset in the server once when you start playing. Stand up straight with your legs about shoulder width apart, look forward and hold the pose until the on-screen countdown finishes.
Calibrate in VRChat
Do this right after the Full Reset countdown, while your trackers are aligned.
Open Calibrate FBT from the Launch Pad
Open VRChat's Quick Menu, select the rocket shaped Launch Pad tab at the bottom, then press Calibrate FBT. This button appears in VR when body trackers are detected.
VRChat official screenshot (2023) Match your avatar's pose
When your avatar spreads its arms into a T pose, hold your arms at the same angle. Place your feet about one foot width apart and match the on-screen foot markers to your real feet. Check that the hip tracker marker is near your waist or hips.
Look forward and press both triggers
Stand upright, lift your head and look straight ahead. Press both controller Interact buttons (usually the triggers) at the same time. If you use arm trackers, line your arms up with the avatar's arms. If your feet sink into or float above the floor, check your VRChat user height and playspace height, then calibrate again.
Button location and calibration steps: VRChat Quick Menu · VRChat Full-Body Tracking
Yaw Reset
Use this when your body drifts sideways during play. Stand at attention so that all trackers face the same direction, then run it.
You do not have to be standing. As long as every tracker is aligned, a Yaw Reset also works while lying down or sitting in a chair.
Mounting Calibration
This works out which way each tracker is attached to your body. Take a ski pose and run it.
- Go down without letting your knees spread outwards. Going down as if pressing your knees together gives a more accurate result.
- Keep your heels on the floor.
- Push your hips back so they are behind your feet.
- Bring your arms back behind you.
Tap to run a reset
Tapping a tracker with your finger also runs a reset. It is on by default in the server.
- Chest tracker, two taps — Yaw Reset
- Left thigh tracker, three taps — Full Reset
- Right thigh tracker, three taps — Mounting Calibration
Taps have to be within 0.6 seconds of each other, and they are ignored while you are moving.
It fires by accident fairly often, and it tends not to register when you actually want it. Clicking the reset buttons on screen is faster and more reliable.
Open Settings and go to Gesture control to turn each one off or change the number of taps.
Feet Calibration
If you put trackers on your feet, set the foot direction once before you play.
Hold the same pose as a Full Reset and stand on your toes with your heels lifted.
Put the tracker on a flat surface for a moment. It re-establishes its reference while at rest. The drift that already happened has to be corrected separately with a Yaw Reset.
Firmware
Firmware updates
With the dongle connected to your PC, the trackers are updated wirelessly as well.
Updating wirelessly
Connect the dongle to your PC
Leave the dongle in the docking station and check that the trackers are powered on.
Open the update page
In Chrome or Edge, go to bbforest.net/en/tracker/ota.
Start the update
The connected devices and their current versions are listed. Press the update button if anything needs updating. Progress is shown on screen.
The update finishes faster with the trackers seated in the docking station.
The browser method works in Chrome and Edge based browsers only.
Updating over USB
Use this when the wireless update does not work. It cannot be done through the docking station, so connect the device directly to your PC.
Connect the cable
Connect the tracker or the dongle directly to your PC with a USB cable.
Hold the function button for 8 seconds
On a tracker, release once red and blue blink together three times. On the dongle, release once the blue indicator starts blinking quickly.
Copy the update file
A drive named EKE_Tracker or EKE_Dongle appears on your PC. Drag the update file, which has a .eke extension, onto that drive and the device restarts by itself.
Do not unplug the cable while an update is running. If you entered update mode by mistake, hold the function button for 2 seconds to leave it.
Troubleshooting
Troubleshooting
Tap the symptom that matches.
It will not turn on
Check that you held the function button for a full 2 seconds. A short press does nothing. If it still will not start, charge it for about 15 minutes and try again.
The tracker does not appear in the server
First check that the dongle is connected and the SlimeVR server is running. If the tracker is on but still does not appear, run pairing again.
The blue indicator blinks once every 2 seconds
The tracker cannot find the dongle. Check that the dongle is connected and the server is running, then turn the tracker on in the same room. After 5 minutes the light stops, but the tracker keeps trying to connect.
Red and blue blink together with a 3 second pause
This is a fault indication. Count how many times they blink. Once means the sensor, twice means power or battery.
If the pattern is gone after a power cycle, you can keep using the tracker. If it keeps repeating, contact us and tell us the number of blinks.
My movement keeps drifting
Stand at attention and run a Yaw Reset. A loose strap causes the same symptom.
If it rotates even while you stand still, put the tracker on a flat surface for a moment. It re-establishes its reference while at rest. See Resets.
One particular tracker keeps dropping out
This is usually the radio conditions at that spot. Move the docking station away from the PC case and place it closer to body height rather than the floor.
Tightening the strap so the tracker sits against your body also helps.
It does not respond at all
Hold the function button for 15 seconds to force a restart. Pairing information and settings are not erased. For the dongle, unplug it from USB and plug it back in.
It is not charging
Try a different cable and power source. If you are using the docking station, check that the tracker is seated all the way down. The red indicator starts fading in and out once it makes contact.
The battery drains quickly
Left in a bag without being turned off, a tracker wakes up every time it is jostled and uses power. Hold the function button for 2 seconds to turn it off when you will not be using it.
Tell us on our Discord channel, with the symptom and how the indicator blinks.
FAQ
Frequently asked questions
Do I need to set up a router or Wi-Fi?
No. The trackers and the dongle talk to each other directly over a dedicated 2.4 GHz link.
Can I use it without a PC?
The setup described here assumes a PC running the SlimeVR server. We are looking into a method that does not need a PC and will post it here once it works.
Do I need to pair again on another PC?
Just move the dongle over. You only need to install the SlimeVR server on the new PC.
Which charger should I use?
Use a PC USB port or an ordinary 5 V USB charger. Do not use a fast charger. A charger is not included in the box.
Is it alright if it gets wet with sweat?
The product is not waterproof. Wipe it with a dry cloth if it gets wet. Wash the straps by hand after removing the trackers, and never wash them with the trackers still attached.
The indicator bothers me in a dark room
The red light that signals normal operation only appears for the first 3 minutes after power-on and then stops. If it keeps blinking, the tracker is charging or the battery is low.
Do I have to update the firmware?
The product works without updating. Checking about once a month is worthwhile.
Can the battery be replaced?
Please do not open the product yourself. If the battery life has become noticeably shorter, please contact us for service.
Can I take it on a plane?
Each tracker contains a 100 mAh lithium polymer battery. Carry-on is allowed, but do not put it in checked baggage. Please check the rules of the airline you are flying with.
Specifications
Specifications and compliance
Specifications
| Product · Model | EKE Tracker BV · EKE Dongle B Model EKE-BV (variants EKE-B-TRK-V / EKE-B-DNG) |
|---|---|
| Size · Weight | Tracker 36 × 36 × 8.5 mm · 10.9 g each / Dongle 19 × 39 × 8.5 mm |
| Wireless | Dedicated 2.4 GHz link |
| Power | Tracker: built-in 3.7 V 100 mAh lithium polymer · USB-C 5 V / Dongle: USB-C 5 V |
| Battery life | Up to 48 hours of continuous use (our own measurement, indoors at approx. 25 ℃) |
| Supported software | SlimeVR server (slimevr.dev) |
| Age | 14 and over |
| Manufacturer · Seller | Parandaenamusup Corp. (파란대나무숲(주)) |
| Country of manufacture | Republic of Korea |
| Warranty | One year (battery six months), from the date of request |
| Service contact | Customer Growth Team · +82 10-8119-3114 · bbforest.net |
Certifications and compliance
| EKE Tracker BV | South Korea · KC conformity registration — R-R-BLBA-EKE-BV |
|---|---|
| Built-in radio module (BMD-340) |
|
| Battery | South Korea · KC safety confirmation — XU100690-17005A |
The CE link is a declaration of conformity; the RCM link lists the applicable test standard.
FCC statements
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: reorient or relocate the receiving antenna; increase the separation between the equipment and receiver; connect the equipment into an outlet on a circuit different from that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.
FCC compliance information
| Product | EKE Tracker BV · set model EKE-BV (EKE-B-TRK-V / EKE-B-DNG) |
|---|---|
| Radio module | u-blox BMD-340 · FCC ID 2AA9B10 (certified modular transmitter) |
| Responsible party | BlueBambooForest Inc. 2803 Phila Pike, Suite B #1562, Claymont, DE 19703, United States +1 (302) 506-4763 · [email protected] |
Warranty
Warranty
Coverage
- For one year from the date of purchase, faults arising during normal use are repaired free of charge.
- The battery is a consumable part and is covered for six months.
- The purchase date is confirmed from your order record or receipt. Without proof of purchase, coverage runs to the last day of the twelfth month after the manufacturing date encoded in the serial number.*
- Coverage is judged by the date we receive your request. If you submit it within the warranty period, we honour the warranty even if the repair itself runs past it.
* You can look up the serial number on the update page (bbforest.net/en/tracker/ota).
Shipping
| Within 3 months of purchase | We pay shipping both ways |
|---|---|
| 3 months to end of warranty | You pay shipping to us |
| After the warranty ends | You pay shipping both ways |
Not covered
- Damage from dropping, submersion or crushing
- Products that have been opened or modified
- Damage from lightning, fire or other natural events
- Faults caused by using an unsupported power source such as a fast charger
- Cosmetic scratches and discolouration of consumables such as straps and tape
- Products whose serial number cannot be read
Repairs may use equivalent or refurbished parts.
Contact
Discord discord.bbforest.net · Email [email protected]
Service centre Suite 712, 66 Gasan-ro 9-gil, Geumcheon-gu, Seoul 08513, Republic of Korea
Open source
Open source licences
The firmware in this product and this guide use the open source software listed below, distributed under the licence terms of each copyright holder.
| SlimeVR-Tracker-nRF | MIT / Apache-2.0 © 2024 sctanf and SlimeVR Contributors |
|---|---|
| Adafruit_nRF52_Bootloader | MIT © 2016 Adafruit Industries · © 2018 Ha Thach for Adafruit Industries |
| vqf-c | MIT © Hugo Chiang |
| TinyUSB | MIT © Ha Thach |
| UF2 | MIT © Microsoft Corporation |
| Zephyr RTOS / nRF Connect SDK | Apache-2.0 Zephyr Project · Nordic Semiconductor ASA |
| nrfx | BSD-5-Clause (Nordic) © Nordic Semiconductor ASA |
| SlimeVR-Docs-Site | MIT © 2021 SlimeVR · SlimeVR server screenshots used in this guide |
| Pretendard | SIL OFL 1.1 © 2023 Kil Hyungjin · body typeface |
| Gmarket Sans | SIL OFL 1.1 © 2019 eBay Korea Co., Ltd. · display typeface |
| Noto Sans CJK | SIL OFL 1.1 © 2014-2021 Adobe · Japanese edition typeface |
| Material Symbols | Apache-2.0 © Google · the tap icon in this guide |
The firmware in this product is based on SlimeVR-Tracker-nRF and Adafruit_nRF52_Bootloader, modified by Parandaenamusup Corp.
This guide embeds only the characters it needs from the typefaces above.
SlimeVR is a trademark of SlimeVR B.V. This product is SlimeVR compatible and is not an official SlimeVR B.V. product.
The original licence file of each project is available at bbforest.net/en/tracker/oss.