Structure Sensor 3: What are the LED light codes?
The LED light indicators on your Structure Sensor 3 can help you understand the sensor’s current status, whether it’s powered on, calibrating, charging, or experiencing an error.
Use this guide to identify the meaning behind each LED sequence, and follow any recommended actions to ensure optimal performance of your sensor.
Healthy Light Sequences
Connected to SDK
Idle
Solid Blue Light
Sensor is connected to Apple device
Low Battery
Solid Yellow Light
Battery is getting too low to stream
Connected to iOS / Host
Idle
Blinking Blue Light
Sensor is connected to Apple device
Low Battery
Blinking Yellow Light
Battery is getting too low to stream
Connected to Charger
Full Battery
Solid Blue Light
100% battery, Charging finished
Mid Battery
Sine Pulse Blue Light
Charged enough to use but not 100%
Low Battery
Sine Pulse Yellow Light
Charging, but not enough to use
Firmware Light Sequences
Updating Firmware
Rainbow Light
While your sensor's firmware is updating the LED light will cycle through all the colors. Do not disconnect the sensor or close the app until the update is complete.
Outdated Firmware
Solid Green Light
Firmware .9- 1.0 will display a green light if the sensor is connected to a PC. If the green light displays while connected to an iPad or iPhone update the sensor's firmware with the Structure app.
Unhealthy Light Sequences
Laser Fault
Solid Red Light
When plugged into a power source, your sensor will initialize and then display a solid red light. This means that the sensor's laser has been disrupted somehow. In most cases, cleaning the glass plate thoroughly, unplugging the sensor, and plugging it back in with sufficient space between the sensor and an object will reset this fault.
The sensor will display this light sequence if the projector is blocked, giving the impression the sensor is faulty. First ensure nothing is directly in front of the projector before assuming defect. Remove the plastic cover if still attached. Next, gently clean the glass plate of any smudges.
System Fault
Blinking Red Light (2 Blinks)
When plugged into a power source, your sensor will initialize and blink red twice, pause, then blink twice again, and repeat.
Firmware update failed
Blinking Red Light (3 Blinks)
When plugged into a power source, your sensor will initialize and blink red three times, pause, then repeat.
If your sensor displays this light sequence when attempting to update the firmware, force close the Structure app and try to update the firmware again.
Firmware Corrupt
Blinking Red Light (4 Blinks)
When plugged into a power source, your sensor will initialize and blink red four times, pause, then repeat.
Calibration / Prod data corrupt
Blinking Red Light (5 Blinks)
When plugged into a power source, your sensor will initialize and blink red five times, pause, then repeat.
MCU Watchdog
Blinking Red Light (6 Blinks)
When plugged into a power source, your sensor will initialize and blink red six times, pause, then repeat.
MCU i2c failed
Blinking Red Light (7 Blinks)
When plugged into a power source, your sensor will initialize and blink red seven times, pause, then repeat.
This light sequence will occur if the communication to charger or eeprom failed.
Voltage Fault
Blinking Red Light (8 Blinks)
When plugged into a power source, your sensor will initialize and blink red eight times, pause, then repeat.
This light sequence occurs if there is a fault with the battery. To troubleshoot, connect the sensor to the Structure app and update the firmware.
NU4k i2c failed
Blinking Red Light (9 Blinks)
When plugged into a power source, your sensor will initialize and blink red nine times, pause, then repeat.
This light sequence occurs when communication to the iap2 chip or camera fails.
If you experience any of the unhealthy light sequences or have any questions please reach out to support@structure.io