SparkFun

SparkFun Qwiic dToF Imager - TMF8821

Name: SparkFun Qwiic dToF Imager - TMF8821
Brand: SparkFun
SKU: SF-SEN-19037
Price: 33.1 AUD
Availability: InStock

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The SparkFun Qwiic dToF TMF8821 Imager is a direct time-of-flight (dToF) sensor that includes a single modular package with an associated Vertical Cavity Sur...

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The SparkFun Qwiic dToF TMF8821 Imager is a direct time-of-flight (dToF) sensor that includes a single modular package with an associated Vertical Cavity Surface Emitting Laser (VCSEL) from AMS. The dToF device is based on Single Photon Avalanche Photodiode (SPAD), time-to-digital converter (TDC) and histogram technology to achieve a 5000mm detection range. Due to its lens on the SPAD, it supports 3x3, 4x4, and 3x6 multizone output data and a very wide, dynamically adjustable field of view. A multi-lens-array (MLA) inside the package above the VCSEL widens up the FoI (field of illumination). All processing of the raw data is performed on-chip and the TMF8821 provides distance information together with confidence values on its I²C interface. The high performance on-chip optical filter blocks most of the ambient light, and enables distance measurements in dark and sunlight environments.

To make it even easier to get your readings, all communication is enacted exclusively via I²C, utilizing our handy Qwiic system so no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1”-spaced pins in case you prefer to use a breadboard. The TMF8821 offers two configurable GPIO pins and one enable (EN) pin, which are broken out as PTH pads. The board also includes a power LED and I²C pull-up resistors, each configurable via jumpers. This version has a footprint that uses the Qwiic Standard size (1.0in. x 1.0in.). For a smaller footprint, check out our Qwiic Mini dToF TMF8821 Imager board!

This sensor is great for projects such as distance measurement for camera autofocus - Laser Detect Autofocus - LDAF (mobile phone), presence detection (computing and communication), object detection and collision avoidance (robotics), and light curtain (industrial).

Note: CLASS 1 LASER PRODUCT CLASSIFIED IEC 60825-1 2014.

Important: We recommend a microcontroller with enough flash to run your program code. Sorry, Uno's (or any development board using the ATmega328P) are out. We recommend choosing either an Artemis Thing Plus, ESP32 Thing Plus, or comparable device as your development board.

The SparkFun Qwiic Connect System is an ecosystem of I²C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.

Get Started with the Qwiic dToF TMF882X Hookup Guide

Features:

Operating Voltage
- 2.7V to 3.6V
- (typically 3.3V via Qwiic cable)
Current Consumption
- 8µA (standby)
- 57mA (active)
AMS TMF8821 Multi-zone Time-of-Flight Sensor
- Direct ToF technology with high sensitivity SPAD detection
- 4x4 configurable multi-zone configuration with multi-object detection
- Fast Time-to-Digital Converter (TDC) architecture
- Sub-nanosecond light pulse
- On-chip histogram processing
- High performance on-chip sunlight rejection filter and algorithm
Measurement Range: 10mm to 5000mm @ 30Hz
Light Source: Class 1 940nm VCSEL
Field of View: adjustable up to 63° diagonally
Max Read Rate: up to 30Hz
2x Qwiic Connectors
I²C Address: 0x41
Operating Temperature Range
- -30°C to +70°C
Breakout Pads
- 1x Ground
- 1x Power
- 1x I²C Port
- 1x Interrupt
- 2x GPIO
- 1x Enable
Power LED (configurable via jumper)
I²C pull-ups (configurable via jumper)
Board Dimensions: 1.0" x 1.0" (2.54cm x 2.54cm)

Documents:

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Jargon buster

Plain-language definitions for the technical terms used above.

ATmega328P: An 8-bit microcontroller chip used on many Arduino Uno-compatible boards. Knowing the controller uses an ATmega328P helps you understand its memory, speed, pin compatibility, and the Arduino sketches it can run.
breakout: A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
GPIO: General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
LED: A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
microcontroller: A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
PCB: A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
photodiode: A photodiode is a light-sensitive component that produces a small electrical signal, a current or voltage, when light falls on it. When a sensor uses several photodiodes, each can be tuned to a different part of the spectrum so the chip can measure several wavelength bands separately.
PTH: Plated through-hole means the pin holes are metal-lined so solder connects the pad on both sides of the board. It is useful for connectors and headers that need a strong mechanical and electrical connection.
Qwiic: Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
UPS: An uninterruptible power supply is a battery-backed power system that keeps a device running when external power is unplugged or fails. For an embedded computer, it helps prevent sudden shutdowns that can corrupt files or interrupt a project.