1. Introduction
The RYSJM C100 Head Up Display (HUD) is designed to project essential car dashboard information directly onto your windshield, allowing drivers to keep their eyes on the road. This device displays data such as speed, engine RPM, water temperature, voltage, and driving distance, helping to enhance driving safety and convenience.
The C100 features levitate imaging with free-form technology and optical coating to correct image distortion and eliminate ghosting, providing a high-definition display. It also includes automatic photo-sensitivity for optimal brightness day and night.
Figure 1: RYSJM C100 HUD Display Overview
Figure 2: C100 Smart Version Features
Figure 3: Levitate Imaging Principle
2. Package Contents
The RYSJM C100 HUD package includes the following items:
- 1 x Head Up Display Unit (C100-HUD)
- 1 x OBD Line
- 1 x Non-slip Mat
- 1 x Dust Removal Cloth
- 1 x User Manual
Figure 4: Package Contents
Video 1: Product Unboxing and Demonstration
3. Specifications
Figure 5: Product Dimensions and Specifications
| Attribute | Value | Attribute | Value |
|---|---|---|---|
| Product Name | C100-HUD | Imaging Screen | LED display |
| Product Color | Black | Display Method | Virtual image reflection |
| Atmospheric Pressure | 86-106KPa | Ambient Temperature | -40°C — +80°C |
| Alarm Sound Level | >=30dB(A) | Environmental Noise | <=60dB(A) |
| Reflective Screen Transmittance | 96% | Virtual Image Distance VID | 55mm |
| Operating Voltage | 9V~16Vdc (12Vdc/400mA) | Product Weight | 60g |
| Product Size (Folded) | 95x62x27mm | Product Size (Expanded) | 95x62x49mm |
| Stand-by Current | <3MA | Wire or Wireless | Wire |
4. Installation
4.1 Compatibility Check
The C100 HUD is designed for gasoline vehicles with an OBD2 (On-Board Diagnostics II) agreement. It is generally compatible with:
- Gasoline vehicles produced in the United States after 2008.
- Gasoline vehicles produced in other regions after 2008 that comply with the OBD2 agreement.
Important: This device is NOT compatible with pre-2008 cars, diesel vehicles, electric vehicles, hybrid vehicles, pickups, or passenger cars.
To confirm if your vehicle is OBD2 certified, check for a sticker under the hood or locate the OBD2 diagnostic port, typically found under the steering wheel or dashboard.
Figure 6: Checking OBD2 Compatibility
4.2 Installation Steps
- Place the non-slip mat on your car's dashboard in a position that allows for a clear view of the HUD display without obstructing your driving view.
- Place the C100 HUD unit on the non-slip mat.
- Locate your vehicle's OBD2 port.
- Connect the provided OBD line to the HUD unit and then to your vehicle's OBD2 port.
- Ensure all connections are secure. The HUD should power on automatically when the vehicle starts.
- Adjust the angle of the reflective screen for optimal viewing.
Figure 7: Adjustable Angle Design
5. Operation
5.1 Basic Functions
- Multi-function Display: The HUD can display speed, engine RPM, water temperature, voltage, and driving distance.
- Fatigue Driving Reminder: Alerts you after continuous driving for more than 4.0 hours.
- Engine Error: Indicates engine fault codes.
- Light Sensor: Automatically adjusts display brightness according to ambient light conditions.
- Speed Unit: Switch between MPH (Miles per Hour) and KM/H (Kilometers per Hour).
Figure 8: Multifunctional Display Modes
Figure 9: Automatic Brightness Adjustment
5.2 Button Functions
The HUD unit features three buttons for control: Power On Key (left), Main Menu (middle), and Increase (right).
Figure 10: Button Layout
- Power Switch (Left Button):
- Long press for 5 seconds: Turns the device off. Press again to turn on.
- Left Button ('<'):
- Short press (1 second): Switches the display mode or navigates menu options.
- Long press (2 seconds): Turns the buzzer off. Press again for 2 seconds to turn it on.
- Middle Button ('M'):
- Short press: In OBD system, switches between voltage, water temperature, and vehicle speed. In menu settings, switches menu options or parameter values.
- Long press: Enters menu settings (see Section 6). Press for 5 seconds to save changes and exit.
- Right Button ('>'):
- Short press: Switches speed mode (KM/H or MPH), adds menu options or parameters after entering settings.
- Long press: Confirms all LED lights are working (for testing). Clears engine fault codes.
5.3 Alarms
- RPM Alarm: Alerts when engine RPM reaches a set value (default 7500 RPM).
- Overspeed Alarm: Alerts when vehicle speed exceeds a set value (default 150 KM/H).
- Water Temperature Alarm: Alerts when water temperature exceeds a set value (default 120°C).
- Voltage Alarm: Alerts when voltage drops below a set value (default 10.0V).
- Fatigue Driving Reminder: Reminds the driver after continuous driving for a set duration (default 4.0 hours).
Figure 11: Alarm Settings Overview
Figure 12: Voltage Alarm and Fatigue Reminder
6. Settings Menu
To enter the settings menu, long press the 'M' button. The menu options are numbered 1-12. Use the '<' and '>' buttons to navigate and adjust values. Short press 'M' to return to the menu, and long press 'M' for 5 seconds to save changes and exit.
| Menu | Function | Range | Default Value | Explanation |
|---|---|---|---|---|
| 1 | Speed Adjustment | 50-150 | 107 | Adjust the displayed speed if there's a discrepancy between HUD and car dashboard (e.g., if dashboard shows 100 KM and HUD shows 105 KM, adjust to 102). |
| 2 | RPM Alarm | 10-75 | 75 | Sets the RPM value at which the alarm will activate (e.g., 7500 RPM). |
| 3 | Overspeed Alarm | 30-250 | 150 | Sets the speed (KM/H) at which the overspeed alarm will activate. Users can freely set this value. |
| 4 | Water Temperature Alarm | 50-150 | 120 | Sets the water temperature (°C) at which the alarm will activate. |
| 5 | Voltage Alarm | 0-15.0 | 10.0 | Sets the voltage (V) at which the low voltage alarm will activate. |
| 6 | Fatigue Driving Reminder | 1.0-8.0 | 4.0 | Sets the continuous driving duration (hours) after which a fatigue reminder will be issued. |
| 7 | Brightness Level | 0-11 | 0 | 0 for automatic photosensitive mode; 1-11 for manual brightness adjustment. |
| 8 | Speed Unit | 0-1 | 0 | 0 = KM/H (Kilometers per Hour); 1 = MPH (Miles per Hour). |
| 9 | Water Temperature Unit | 0-1 | 0 | 0 = °C (Celsius); 1 = °F (Fahrenheit). |
| 10 | Turn Off Voltage | 0-15.0 | 0 | If HUD does not auto turn off, set this voltage (e.g., 13.2V or 13.5V). |
| 11 | Turn Off Time | 5-300 | 20 | The default shutdown time is 20 seconds. For cars with gas-electric hybrid or start-stop systems, delay this time (e.g., 180s) to prevent premature shutdown. |
| 12 | Factory Reset | 0-1 | 0 | Set to 1 and hold the 'M' button down for 5 seconds to save and exit, performing a factory reset. |
7. Troubleshooting
If you encounter any issues with your C100 HUD, please refer to the following common problems and solutions:
-
Screen without Display or Power
Solution: Ensure the OBD cable is securely and tightly connected. Try unplugging and re-plugging the OBD cable several times. If possible, test the HUD in another compatible vehicle to rule out a device malfunction.
-
HUD Shows Voltage Then Powers Off After 30 Seconds
Solution: This indicates a compatibility issue. The HUD is only compatible with gasoline vehicles that have an OBD2 or EOBD agreement (generally manufactured after 2008). It does not support JOBD or OBDI protocols. Confirm your vehicle's compatibility as described in Section 4.1.
-
Crashes Due to Other OBD Devices or Modifications
Problem: If your car has other OBD devices (e.g., parking sensors, TPMS monitors, car window closers) or has been modified (e.g., central control navigation, electronic throttle controller, speed cruise, computer system refresh, one-click start-up, keyless entry, remote start), it might cause the HUD to crash.
Solution: Unplug other OBD devices. Perform a factory reset (Menu 12). If the issue persists, try using the HUD alone without other modifications or devices, or test it in another compatible vehicle.
-
Inaccurate Speed Display
Solution: If there is a difference between the speed displayed on the HUD and your car's dashboard, you can fine-tune the value in Menu 1 (Speed Adjustment). For example, if your dashboard shows 100 KM/H and the HUD shows 105 KM/H, adjust the parameter value to 102 (107 - 5 = 102, assuming 107 is the default and 5 is the difference). Long press the 'M' button for 5 seconds to save your adjustment.
-
HUD Shuts Down Prematurely with Automatic Start/Stop Systems
Problem: In vehicles with automatic start/stop systems, the engine may stop running, causing the HUD to shut down after 20 seconds.
Solution: Adjust the shutdown time in Menu 11 (Turn Off Time). Increase the value (e.g., to 180-300 seconds) to prevent the HUD from turning off when the engine temporarily stops.
-
HUD Does Not Auto Power Off (RPM or Speed Not at 0)
Solution: If the HUD remains on even when the car is off and RPM/Speed is 0, enter the menu by long pressing the 'M' button. Set the voltage in Menu 10 (Turn Off Voltage) to 13.2V or 13.5V. The HUD should then turn off after 3 minutes.
-
HUD Automatically Restarts
Problem: This indicates that the car's voltage is higher than the starting voltage of 13.2 volts.
Solution: Adjust the voltage setting in Menu 10 (Turn Off Voltage) to 13.6-13.8V. The HUD will automatically turn on when the voltage is higher than 13.2V.
8. User Tips
- Long-Term Storage: If you do not plan to drive your car for more than a week, it is recommended to manually turn off the HUD or unplug the OBD device to prevent battery drain, as the standby current is around 20mA.
- Compatibility Confirmation: Always double-check your vehicle's compatibility with OBD2/EOBD protocols and ensure it is a gasoline vehicle manufactured after 2008 before purchasing or installing.
- Early Testing: Test the device in your car as soon as possible after receiving it to confirm functionality and compatibility.
- Avoid Interference: If you experience crashes or erratic behavior, temporarily remove other OBD-connected devices or car modifications to isolate the issue.
9. Warranty and Support
For detailed warranty information or further technical support, please refer to the full user manual PDF available at this link. If you encounter any issues not covered in this manual, please contact the seller for assistance.
