ESP32 usage Triple VL53L0X

[RC_Trucker_WN]

3x VL53L0X shows no readings For an application I need 3 VL53L0X TOF sensors. The code can be used to successfully boot the three sensors. However, only the third sensor provides a measured value. If the sensors are used individually, boot and measurement is OK.

Do sensor 1 and sensor 2 have to be activated by function

[RC_Trucker_WN]

 additional info for the question:

I added the Serial output with debug option

 

The Range status of sensor 1 and 2 ist “0” like sensor 3

The “RANGE IGNORE THRESHOLD” for sensor 1 and 2 is much higher than sensor 3. Might this be a hint to the solution?

I don’t know what the “RANGE IGNORE THRESHOLD” mean ?

Is there probably a problem with the calibration?

 

For the function I only want to recognice if there is a object in front of the sensor. The amount of the Measurement is not realy important.

 

 

[Bin]

Hi:

1. From the code you shared, the issue is most likely related to the XSHUT control sequence during sensor initialization.

You assign a new I2C address to each VL53L0X one by one, but when you enable the next sensor, you pull the previous one back to LOW again.

For example:

• when you initialize sensor 2, you set sensor 1 XSHUT to LOW
• when you initialize sensor 3, you set sensor 1 and sensor 2 XSHUT to LOW

This means the previously initialized sensors are reset again. As a result, only the last sensor remains active correctly, which matches your observation that only sensor 3 provides readings.

2. Log data shows:

12:53:53.984 -> Status of XSHUT 1 1 1 Sensor_OK 1 1 1
                        12:53:53.984 -> sVL53L0X: PerformSingleRangingMeasurement
                        12:53:54.079 -> Range Status: 0 : Range Valid
                        12:53:54.079 -> RANGE IGNORE THRESHOLD: 116.20
                        12:53:54.079 -> Measured distance: 0
                        12:53:54.079 -> sVL53L0X: PerformSingleRangingMeasurement
                        12:53:54.126 -> Range Status: 0 : Range Valid
                        12:53:54.126 -> RANGE IGNORE THRESHOLD: 97.00
                        12:53:54.126 -> Measured distance: 0
                        12:53:54.126 -> sVL53L0X: PerformSingleRangingMeasurement
                        12:53:54.173 -> Range Status: 0 : Range Valid
                        12:53:54.173 -> RANGE IGNORE THRESHOLD: 23.91
                        12:53:54.173 -> Measured distance: 111

the reason is enabling limit check with a certain threshold. you can disable it or reset a new threshold for your application. 

Best Regards,

Bin FAN