How to display voltage?

eurban

Hello, How do I get my Dudu7 to display the vehicle system voltage? I thought I saw a video somewhere where the vehicle's voltage was displayed at the top right of the screen? From what I gather it is a built in function of the headunit and doesn't require OBD but rather just reads the voltage being given to the head unit. Thanks for any info!

Neckbone

eurban you are correct, it’s a setting somewhere just can’t remember. I have it displayed on top of my head unit. I will look when I put my bash back together

Neckbone

eurban go to settings/home/status bar and you will find multiple items to choose from

eurban

Neckbone
Thank you.

DUDU-Meng

settings/HOME/Status Bar/vehile Voltage Information (on)

eurban

Ok, so I just have the unit connected up to a 12v (13.3 actually) power supply in my basement. I have both the red and yellow wires connected to the + of my power supply. I have activated the voltage item in the status bar and it doesn't display the voltage. It shows up on the status bar but with no voltage number. In the settings for the status bar, there is a little question mark next to some of the items and when you click on the question mark next to voltage, it says that voltage display requires OBD2 reader or FYT support. Unless I am missing some other setting, you can't display the vehicles voltage in the status bar without the OBD reader? I thought this came from an internal sensor in the unit itself? Any help would be great, thanks.

JhonnyD

eurban You have to connect. ACC, + and -

eurban

JhonnyD Yes of course. I have the unit RUNNING with red / yellow to positive and black to negative and the unit runs just fine. That is not the issue. The issue is that the operating voltage is not displayed when I put voltage in the status bar. I have read elsewhere, that the voltage readpout comes froma sensor in the unit, not from OBD2 but it's not working for me (no OBD2 dongle installed)

DUDU-Meng

The voltage needs to be floating to send data.
Voltage in a car is unstable and will change frequently. Theoretically, it could display the voltage normally.

eurban

DUDU-Meng Interesting. I will have to see then what it does when installed in the car. Thank you!

JhonnyD

On my test bench i can see the voltage.
It is working with a AC 12 Volt power supply.

DUDU-Meng

The voltage is constant at the same value After rebooting it does not monitor the voltage value because the voltage does not fluctuate The system does not send voltage data.
In a car, this would not be a problem, because the voltage in a car changes all the time.

abidali

DUDU-Meng My DUDU7 unit display 13.3-13.6v even if at battery using multimeter it show 14.2v when engine is running.

Even when driving at 100KM/h, the displayed voltage on DUDU7 screen doesn't go past 13.6v. Is it possible to display correct voltage on screen?

Petergriffin

abidali

Cuando tu vehiculo marca con multimetro por ejemplo 13.6v o 13.3v Dudu marca siempre una diferencia de voltaje inferior a la del vehiculo??por ejemplo real 13.6 y DUDU pone 13v ??

surfer63

abidali DUDU-Meng My DUDU7 unit display 13.3-13.6v even if at battery using multimeter it show 14.2v when engine is running.

Even when driving at 100KM/h, the displayed voltage on DUDU7 screen doesn't go past 13.6v. Is it possible to display correct voltage on screen?

I have the same, but only after the 20250905 (or 20250909) update. Before that it showed 14.1 Volts.

abidali

surfer63 the incorrect voltage reporting is only when engine running. When I put external battery charger (engine switched off), it reports accurately in ACC mode. Weird behavior.

DUDU-Meng

surfer63
The voltage is supplied by the MCU. The system cannot determine whether it is the correct voltage value. If there is a deviation, you can calibrate it to the correct voltage value under Settings > Lab > Voltage Calibration.

picasso1850

my dudu7 always shows it at 12.8v with occasional fluctuations to 13.1.

OBD reads 13.6-13.8 constant

Petergriffin

picasso1850

No hay que tomar como fiable ni OBD ni Dudu...ambos pueden tener un margen de error.

Lo idoneo es medir voltaje directo en bateria con multimetro , comparar con el voltaje que ofrece DUDU y si existe diferencia corregir el voltaje de DUDU en el menu de laboratorio existe una apartado de " correcion de voltaje " donde se puede añadir voltaje o restar voltaje dependiendo del error que ofrezca Dudu.

Yo tengo un modulo Bluetooth que se conecta directo a bateria y se deja instalado y monitorea el estado de la bateria siempre , con una app en telefono me conecto al modulo de bateria y me da registros de consumo , carga , soc ,temperatura , prueba de arranque ,etc... todo queda registrado en el telefono y puedo testear voltaje dado por DUDU y voltaje real de bateria en tiempo real y asi corregir voltaje de DUDU en las opcion de correccion de voltaje.

surfer63

DUDU-Meng The voltage is supplied by the MCU. The system cannot determine whether it is the correct voltage value. If there is a deviation, you can calibrate it to the correct voltage value under Settings > Lab > Voltage Calibration.

I did an MCU update some weeks ago, same with the bluetooth firmware upgrade (we discussed about that in another thread).
I thought the deviation was due to the Dudu firmware, but I now think it is due to the DUDU7_MCU_20250715-2.7z MCU firmware.
It means that the new MCU firmware contains an error as it displayed correctly on the old 2024 MCU firmware.

DUDU-Meng

surfer63 Battery voltage can be measured using an instrument for calibration.