Adafruit 9-DOF LSM9DS1 Breakout Board - STEMMA QT / Qwiic
SKU: TH2025
In Stock₹2,311.62
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SKU: TH2046
Adafruit LTR-329 Light Sensor - STEMMA QT / Qwiic is a simple and reliable I2C ambient light sensor breakout for measuring light over a wide range. It provides 16-bit readings for both Infrared and Visible+IR channels, making it useful for projects that need more than a basic photoresistor-style output.
With configurable gain and integration time, the LTR-329 can measure from very low light levels up to 64k lux. Its spectral response is designed to be close to the human eye, and it also includes flicker rejection for 50/60 Hz lighting, helping deliver more stable readings indoors.
This breakout adds a voltage regulator, level shifting, and both STEMMA QT / Qwiic connectors plus 0.1 inch header breakout pins, so it works easily with 3.3V and 5V microcontrollers. Please note that this version does not include an interrupt output; if you need IRQ or alert functionality, the LTR-303 variant is the better fit.
Technical details for the Adafruit LTR-329 Light Sensor breakout.
| Brand | Adafruit |
|---|---|
| Sensor | LTR-329ALS-01 |
| Interface | I2C, up to Fast Mode 400 kbit/s |
| I2C Address | 0x29 (fixed, cannot be changed) |
| Resolution | 16-bit effective resolution |
| Light Range | 6 dynamic ranges from 0.01 lux to 64k lux |
| Sensor Response | Close to human eye spectral response |
| Optical Features | Immunity to IR / UV light source, automatic 50 / 60 Hz flicker rejection |
| Compensation | Built-in temperature compensation circuit |
| Power Characteristics | Low active power consumption with standby mode |
| Operating Temperature | -30 C to +70 C |
| Compliance | RoHS and Halogen free compliant |
| Board Features | Voltage regulator, level shifting, 0.1 inch header breakout, STEMMA QT / Qwiic connectors |
| Logic Compatibility | Works with both 3.3V and 5V systems |
The breakout is designed for straightforward I2C wiring and solderless QT/Qwiic connections.
| Pin | Name | Function |
|---|---|---|
| 1 | VIN | Power input for the breakout. Use 5V with 5V boards like Arduino, or 3V with 3.3V boards. |
| 2 | 3V | Regulated 3.3V output from the onboard regulator, available for external use up to 100mA. |
| 3 | GND | Common ground for power and logic. |
| 4 | SCL | I2C clock line. |
| 5 | SDA | I2C data line. |
Adafruit provides library support for CircuitPython, Python, and Arduino, with example code to help you get started quickly. It can also be used with Raspberry Pi systems via PyPI, and with full-sized computers using an MCP2221 breakout.
Note: A QT cable is useful for solderless connection, but it is not included. The I2C address is fixed at 0x29, so you cannot place multiple LTR-329 boards with the same address on one bus without additional hardware.
It uses an I2C interface and supports up to Fast Mode at 400 kbit/s. The board also includes STEMMA QT / Qwiic-compatible connectors for the I2C bus.
Yes. The breakout includes a voltage regulator and level shifting circuitry, so it can be used with 3.3V boards like Raspberry Pi or Feather, as well as 5V boards such as Arduino.
The sensor provides 16-bit readings for both Infrared and Visible+IR channels. With configurable gain and integration time, it can measure across a wide range from 0.01 lux to 64k lux.
No. This LTR-329 breakout does not include interrupt output; if you need alert and IRQ capability, the LTR-303 version is the related option mentioned by Adafruit.
Yes, a compatible STEMMA QT or Qwiic cable can be used for a solderless I2C connection. The board also breaks out the pins to a standard 0.1 inch / 2.54 mm header if you prefer wired connections.
The I2C address is 0x29. According to the supplier information, this address is fixed and cannot be changed.
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