Set Up FPVSIM Timer V3 with Mahjong USB
Install and configure the FPVSIM Timer V3 Mahjong USB edition for reliable lap timing.
Connect FPVSIM Timer Solo to an iPhone or iPad, complete setup, and calibrate it for consistent lap detection.
What this tutorial covers
This walkthrough assembles a Timer V2 Solo enclosure, powers the unit, connects the iOS app to the timer hotspot, and explains the RSSI peak, enter threshold, and leave threshold used to detect a pass.
It was recorded against an earlier app and hardware generation. Current automatic calibration can reduce the manual work, but the RSSI explanation remains useful when diagnosing missed or duplicate laps.
Prerequisites
- FPVSIM Timer Solo hardware, the matching enclosure, and any recommended heat sink.
- A regulated 5 V USB-C power source and suitable cable.
- The FPVSIM Timer app installed on the iPhone or iPad.
- A quad with its VTX on the channel selected in the Timer app.
- A representative timing-gate location, preferably on a straight and repeatable flight line.
First-time setup
- Assemble the enclosure without stressing the USB port.
Align the board, USB-C opening, and enclosure slots before closing the case. Attach the heat sink as shown for the hardware. Adhesive is optional and should not cover connectors or components that need airflow.
- Power the timer and join its hotspot.
In iOS Wi-Fi settings, connect to the network whose name begins with the FPVSIM timer prefix. Then return to the Timer app and choose the timer-hotspot connection.
- Confirm channel and live RSSI.
Select the VTX channel in use and watch the RSSI trace while the quad approaches and leaves the timing point.
- Understand the three detection values.
A valid pass rises above the enter threshold, reaches a peak, and then falls below the leave threshold. The time at the strongest signal is used as the pass time.
- Reduce missed or duplicate laps carefully.
A peak set too high can miss passes. Thresholds that are too permissive can accept nearby flight. Physical timer placement and a clean flight line should be improved before making large sensitivity changes.
- Validate with a race and its history.
Run several normal laps, apply a realistic minimum-lap-time guard if needed, and inspect the saved RSSI history rather than judging only the short live window.
Use current calibration features when available.
The video demonstrates manual interpretation of older controls. In newer Timer releases, begin with automatic calibration, then use the same RSSI principles to review and fine-tune the result.
Edited transcript
This is a cleaned version of the public English captions. Product names and RF terminology were corrected; the recorded UI remains version-specific.
About 00:00
Today we will assemble an FPVSIM Timer V2 and complete its first-time setup. Align the USB-C opening and the slots in the printed enclosure, push the board into place, and close the rear cap. You can sand the enclosure edges for a better fit or add a small amount of suitable adhesive so the case does not separate. Then attach the heat sink to help dissipate heat.
About 01:30
Power the timer from a 5 V USB-C source. Install the Timer app for your platform, then connect the phone to the timer hotspot before asking the app to connect. The hotspot name begins with the FPVSIM timer prefix. It has no password by default in this demonstration, although a password can be configured later.
About 03:00
After the app connects, you can view the RSSI trend, choose a channel, and change detection settings. Read the instructions beside the controls because the graph is the main tool for diagnosing detection problems. Router mode can provide more range and, when the router has Internet access, can keep online workspace features available while the timer is connected.
About 06:00
The timer detects a passing quad from VTX signal strength. The signal rises as the quad approaches and falls as it leaves. The peak is the strongest observed signal. A pass must rise above the enter line and fall below the leave line; the time of the strongest signal during that event becomes the estimated crossing time.
About 07:30
Place the timing point on a fast, straight line so the peak is clear and repeatable. If passes are missed, the peak may be set too high. Lower it carefully until normal passes are detected. If duplicate detections appear, adjust the thresholds or use a realistic minimum lap time to reject impossible repeats.
About 09:00
Start a session and test real laps. The first pass can be treated as the holeshot, depending on race mode. After finishing, open race history to inspect the entire RSSI record. Tap or point at the graph to read values and use that evidence to adjust the peak and thresholds. Submit the race when the review is complete.
Frequently asked questions
Why does iOS say the timer network has no Internet?
The timer hotspot is a local connection and may not provide Internet access. Depending on iOS and the app version, cellular data may remain available. Router mode is another option when both timer access and Internet access are needed.
What causes a missed lap?
Common causes include a peak value above the real pass signal, an unsuitable channel, poor timer placement, or a flight line that never produces a clear rise and fall in RSSI.
What causes a duplicate lap?
Nearby flight or noisy thresholds can create more than one valid-looking event. Improve placement first, then tune thresholds and use minimum lap time only as a guard against physically impossible repeats.
Is manual calibration still required?
Not always. Newer releases include automatic calibration. Manual RSSI review remains valuable for validating the result or troubleshooting an unusual course.
