CHRONO

Position the device so that its top — the side carrying the button interface and the BYB Chrono logo — faces upward, toward the sky. A clear view of the sky is what gives a fast fix and accurate positioning.

The supplied plastic mount covers most installations on a frame, chassis, handlebar, roll cage or helmet. Alternatively, the three M3 threaded interfaces can be used to build a dedicated custom mounting.

The magnet is only needed when the speed sensor is in use — see Operating modes.

1. 01
   Fit the magnet to the spokes or to the disc with two thin cable ties.
2. 02
   Check that the magnet is detected — the speed sensor LED turns green while a magnet passes it.
3. 03
   Enter the wheel diameter in the app. See Wheel size.

The device can be run in four configurations, from GPS alone to GPS with both a speed sensor and external triggers. They are described in Operating modes.

The buttons and LEDs carry every function of the device. What each button does is in Buttons; the power, run and charging LEDs are in LEDs.

Network name

BYB-Chrono

Password

bybchrono

1. 01
   Switch the device on and hold the run button for 1.5 seconds. The run LED starts blinking quickly.
2. 02
   On your phone or computer, look for the Wi-Fi network above in the list.Once the device has been renamed, the network is BYB- followed by the new device name. See Settings reference.
3. 03
   Connect using the password above (bybchrono) — all lower case, one word, no spaces.
4. 04
   Your device may report "Connected" or "Connected without internet" — both are normal.
5. 05
   Open the device page in the app and wait for the data to load. Settings can now be changed and runs downloaded.
6. 06
   When configuration or downloading is complete, press and release Run to disconnect Chrono. Leaving connection mode switches Chrono off; switch it on again before recording.

Send the rider profile to Chrono before starting a session. Chrono records the selected rider and vehicle in each run so the software can place downloaded recordings in the right profile.

1. 01
   Create or select the rider profile in the software. See Rider profiles.
2. 02
   Connect to the unit over Wi-Fi. See Connecting to Chrono.
3. 03
   Open "Device" → "Chrono" and select "Rider" under "Device and rider".
4. 04
   Select "Vehicle" from the rider’s Garage if the runs should be associated with a vehicle.
5. 05
   Press "Apply" and wait for saving to finish.
6. 06
   Check that the saved rider and vehicle match the session before leaving connection mode.

Device name

The name assigned to the device. In connection mode it is also the Wi-Fi network name, as BYB- followed by this name — BYB-Chrono until it is changed.

Rider

The profile that should receive downloaded runs. Select it and press "Apply" before recording. See Sending the rider profile.

Vehicle

The vehicle from the selected rider’s Garage to associate with the recordings. Sent with "Apply" together with the rider. See Sending the rider profile.

Lap type

Closed or open circuit. See Lap type.

External trigger

Enables or disables the use of external triggers.

External trigger ID

The ID of the trigger or triggers in use. It must match the ID set in the triggers themselves. See Trigger ID.

Speed sensor

Enables or disables the built-in speed sensor.

Wheel diameter

The size of the wheel the speed sensor reads, used to calculate speed and distance. See Wheel size.

Heart rate sensor

Enables or disables a BLE heart rate sensor. Enabling it activates Bluetooth Low Energy.

Power meter sensor

Enables or disables a BLE power meter. Enabling it activates Bluetooth Low Energy.

IMU orientation

How the device is installed, used to calculate advanced metrics. See IMU orientation.

IMU calibration

The stored reference from 3 accelerometer and 3 gyroscope readings with Chrono mounted and the vehicle stationary. See IMU calibration.

Device password

The password of the device’s Wi-Fi network.

Format SD

Erases every run stored in the memory.

Factory reset

Returns the whole device to its factory configuration.

Identity and recording settings are sent to Chrono when you press "Apply". Wait for saving to finish before leaving connection mode or recording. The capture and reset commands in IMU calibration run immediately.

Chrono runs in four configurations. GPS is always active; the speed sensor and the external trigger are each switched on or off in the configuration menu, and the combination is the mode.

GPS alone records the complete route and speed, and is the basis of every other mode. Route data cannot be loaded into the app without a fix, so always wait for one.

Adding the speed sensor gives accurate speed and distance based on wheel rotation. It can improve accuracy where GPS reception is weak, such as under tree cover, and makes distance-based comparison between runs more accurate. Route and distance from GPS are always recorded; the speed sensor adds a second, wheel-based distance.

Adding external triggers gives timing that does not depend on GPS reception quality: each trigger is placed along the track and records the exact moment it is crossed.

The total number of triggers in use must be entered in the app.

Using both together is the most precise and comprehensive mode — speed, distance and timing in one recording.

Open lap

The track has a distinct start and a distinct finish; entry and exit points are separate.

Closed lap

The track is a loop with a shared start/finish line. The entry and exit laps are automatically excluded from every calculation.

The trigger ID selects the group of triggers Chrono receives; it can be customised and defaults to CHRONO. Each trigger’s role identifies its job on the track — see Configuration. The trigger itself is covered in External trigger.

The wheel size tells the device how far one revolution of the wheel carries the vehicle, so it can turn sensor pulses into speed and distance. It refers to the wheel the built-in speed sensor reads.

Select a standard size from the list, or enter a custom diameter in millimetres.

Chrono connects to commercial BLE heart rate monitors and power meters. Each sensor is paired once; its unique ID is then stored in the device for later sessions.

1. 01
   Wake the sensor — wear the heart rate strap, or move the power meter.
2. 02
   Enable Wi-Fi mode on the device.
3. 03
   Open the app and go to the device configuration menu.
4. 04
   Tap "Scan heart rate sensor" or "Scan cycling power meter sensor".
5. 05
   Wait for pairing to finish — the unique code of the paired sensor is displayed.
6. 06
   Set "Heart rate sensor" or "Power meter sensor" to YES before starting a run.

The IMU orientation tells the device how it is installed, so that the direction of each axis is known and advanced metrics can be calculated.

In Device > Chrono, set "Front", "Top" and "Right" in the "IMU orientation" card to the signed device axes pointing toward the front, top and right of the vehicle. Press "Apply" to send these settings.

IMU calibration captures 3 accelerometer and 3 gyroscope reference readings with Chrono mounted and the vehicle still and level. Chrono stores these readings in future runs; the software uses them with the mounting directions to align the motion axes and remove stationary gyro bias.

If the "IMU calibration" card is unavailable, update Chrono through Device firmware updates, then reconnect.

"Reset calibration" in the same card clears the stored IMU reference. Capture a new reference before recording again; changing this reference does not change runs already recorded. Corrections to existing runs belong to Calibration of recorded runs.

A trigger is configured the same way as Chrono: it creates its own Wi-Fi network, and the app talks to one device at a time. Connect to the trigger to change its settings, then reconnect to Chrono to record.

The trigger opens its Wi-Fi configuration window for 3 minutes after switch-on. Each configuration request renews the 3-minute window; a firmware update keeps it open until the update finishes. Once this window closes, Wi-Fi configuration is unavailable until the trigger is switched off and on again. The trigger continues to provide track timing after the configuration window closes.

Network name

TRIGGER-CHRONO

Password

Not required

After a trigger ID change, join TRIGGER- followed by the saved ID.

1. 01
   Switch the trigger on. The power LED starts blinking slowly.
2. 02
   Within 3 minutes of switch-on, look for the Wi-Fi network above on your phone or computer. If the configuration window has closed, switch the trigger off and on, then try again.
3. 03
   Join the trigger network.
4. 04
   Your device may report "Connected" or "Connected without internet" — both are normal.
5. 05
   Open the device page in the app and wait for the data to load. The trigger settings can now be changed.

Trigger ID

The group ID shared by Chrono and its triggers. Its Wi-Fi network is TRIGGER- followed by this ID; the default is TRIGGER-CHRONO. Enter the same ID in Chrono — see Trigger ID.

Trigger role

Choose "Start", "Finish", "Start/Finish", a numbered split ("Split 1" to "Split 99"), or "Automatic". "Automatic" leaves the role unassigned; the software determines the gates from the order in which the triggers are crossed.

Factory reset

Returns the trigger to its factory configuration.

1. 01
   Connect to the trigger’s own Wi-Fi network. See Connecting to a trigger.
2. 02
   Open "Device" → "Trigger" in the software.
3. 03
   Set "Trigger ID" to match the ID configured on Chrono.
4. 04
   Choose "Trigger role" for this gate, or leave it as "Automatic".
5. 05
   Press "Apply" to send the configuration to the trigger.

Changing the ID restarts the trigger and changes its Wi-Fi name, so reconnect to the new network. Changing only the role saves without a restart. Reconnect to Chrono to check its trigger ID and count before recording; recorded lap analysis is covered in The Lap manager.

Where the triggers sit on the track decides the quality of the timing.

1. 01
   Remove the micro USB protective cap.
2. 02
   Connect a micro USB cable to the port.
3. 03
   Charge from a PC USB port or a phone charger rated 5 V, 1 A.
4. 04
   Wait for the charging LED to go out — lit means charging, off means fully charged.
5. 05
   Refit the protective cap before the next ride.

Chrono is an electronic device. Clean it gently with water and a soft cloth.

Check which rider profile is active in the software. Chrono downloads are placed according to the identity recorded in each run; the selected software profile may be different, or the correct rider profile may not have been sent to the unit before the session.

1. 01
   Look for the recordings under the other rider profiles and Guest.
2. 02
   Correct the downloaded run’s assignment if needed. See Run assignments.
3. 03
   Before the next session, select the correct rider on Chrono and press "Apply". See Sending the rider profile.

Some phones drop the device network because it offers no internet access.

Disable mobile data, or turn off the option that switches automatically to a network with internet access, while the device is connected.

Switch the device on a few minutes before the run and leave it in a steady position with a clear view of the sky — two to ten minutes is usually enough. The run LED turns solid green once a reliable 3D fix is acquired.

Logging started before a solid fix was acquired. Always wait for the run LED to turn solid green before starting an acquisition — see The device cannot get a GPS fix.

Hold the power button until the device reboots, about 15 seconds.