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Reference Designs

Learn how to use EAGLE from a variety of example projects.

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SparkFun OpenLog by SparkFun Electronics

Autodesk EAGLE Design Block Description: The SparkFun OpenLog is an open source data logger that works over a simple serial connection and supports microSD cards up to 64GB. The OpenLog can store or “log” huge amounts of serial data and act as a black box of sorts to store all the serial data that your project generates, for scientific or debugging purposes. The SparkFun OpenLog runs off of an onboard ATmega328, running at 16MHz thanks to the onboard crystal.The OpenLog draws 6mA when recording a 512 byte buffer, but as that process takes a fraction of a second, the average current draw is closer to 5mA. Keep in mind though that if you are recording a constant data stream at 115200bps, you will approach that 6mA limit. All data logged by the OpenLog is stored on the microSD card that involves the features of 64MB to 64GB capacity and FAT16 or FAT32 file type. Features: VCC Input: 3.3V-12V (Recommended 3.3V-5V) Log to low-cost microSD FAT16/32 cards up to 64GB Simple command interface Configurable baud rates (up to 115200bps) Preprogrammed ATmega328 and bootloader Four SPI pogo pins Two LEDs indicate writing status 2mA idle, 6mA at maximum recording rate

600 Downloads | 252 Likes | 08.08.2017

SparkFun nRF52832 Breakout by SparkFun Electronics

Autodesk EAGLE Design Block Description: The nRF52832 is Nordic Semiconductor’s latest multiprotocol radio System on Chip (SoC). It’s half microcontroller, with a list of features including 32 configurable I/O pins, SPI, I2C, UART, PWM, ADC’s, 512kB flash, and 64kB RAM. And it’s half 2.4GHz multiprotocol radio, supporting Bluetooth Low Energy (BLE), ANT, and Nordic’s proprietary 2.4GHz ultra low-power wireless communication – it even features on-chip NFC tag support. SparkFun’s nRF52832 Breakout provides easy access to all of the chip’s features. It breaks out all of the nRF52’s I/O pins, provides a 32.768kHz RTC crystal, a user-programmable button and LED, and a trace antenna to send and receive those 2.4GHz transmissions. Plus, to make the chip as easy-to-flash as possible, the breakout comes pre-programmed with a serial bootloader. Nordic’s nRF52832 is a SoC that combines an ARM Cortex-M4F microprocessor with a 2.4GHz multiprotocol radio. In addition to providing access to all of the chip’s I/O pins, the breakout board includes a handful of external components. The nRF52832 can operate on a power supply between 1.7 and 3.6V. The board also includes a 3.3V regulator with a maximum input of 6V, if you want to power the board with batteries or a regulated wall supply. Features: Bluetooth Low Energy (BLE), ANT and proprietary 2.4GHz radio support 32-bit ARM Cortex-M4F Processor Easy access to all 32 GPIO SPI, I2C, UART, PWM and ADC I/O support User-programmable LED and button 32.768kHz RTC Crystal Pre-programmed serial bootloader

562 Downloads | 244 Likes | 08.08.2017

SparkFun 9DoF IMU Breakout - LSM9DS1 by SparkFun Electronics

Autodesk EAGLE Design Block Description: The LSM9DS1 is a versatile, motion-sensing system-in-a-chip. It houses a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer – nine degrees of freedom (9DOF) in a single IC! The LSM9DS1 is equipped with a digital interface, but even that is flexible: it supports both I2C and SPI, so you’ll be hard-pressed to find a microcontroller it doesn’t work with. This IMU-in-a-chip is so cool we put it on the quarter-sized breakout board you are currently viewing! The LSM9DS1 is one of only a handful of IC’s that can measure three key properties of movement – angular velocity, acceleration, and heading – in a single IC. By measuring these three properties, you can gain a great deal of knowledge about an object’s movement and orientation. The LSM9DS1 measures each of these movement properties in three dimensions. That means it produces nine pieces of data: acceleration in x/y/z, angular rotation in x/y/z, and magnetic force in x/y/z. The LSM9DS1 Breakout has labels indicating the accelerometer and gyroscope axis orientations, which share a right-hand rule relationship with each other. Each sensor in the LSM9DS1 supports a wide spectrum of ranges: the accelerometer’s scale can be set to ± 2, 4, 8, or 16 g, the gyroscope supports ± 245, 500, and 2000 °/s, and the magnetometer has full-scale ranges of ± 4, 8, 12, or 16 gauss. Features: 3 acceleration channels, 3 angular rate channels, 3 magnetic field channels ±2/±4/±8/±16 g linear acceleration full scale ±4/±8/±12/±16 gauss magnetic full scale ±245/±500/±2000 dps angular rate full scale SPI / I2C serial interfaces Operating Voltage: 3.3V

542 Downloads | 270 Likes | 08.08.2017

LilyPad Arduino USB - ATmega32U4 Board by SparkFun Electronics

Autodesk EAGLE Design Blocks Description: The LilyPad Simple just got a whole lot… simpler. We’ve updated the Simple board to create the LilyPad USB by replacing the classic ATMega328 with the new ATMega32U4. Not only does that mean that it’s running a variation of the latest and greatest bootloader, but it also means no more FTDI Basic! The only extra piece of hardware you need to program the LilyPad USB is a micro-USB cable since the new IC has built-in USB support. The LilyPad USB is also officially supported in the Arduino IDE as of version 1.0.2! Just like the LilyPad Simple, this board operates at 3.3V and features a JST socket so you can directly connect a Li-Po battery for power and an on-board power switch so you can turn it off when you’re not feeling particularly blinky. These boards were designed to streamline your next sewable project by keeping things simple and giving you more room to work while eliminating the need to sew a power supply. The LiPo battery is even rechargeable through the board, no more special external LiPo chargers required! LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They’re even washable! Dimensions: 50mm outer diameter Thin 0.8mm PCB

604 Downloads | 223 Likes | 08.08.2017

SparkFun Load Cell Amplifier - HX711 by SparkFun Electronics

Autodesk EAGLE Design Block Description: The SparkFun Load Cell Amplifier is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. By connecting the amplifier to your microcontroller you will be able to read the changes in the resistance of the load cell, and with some calibration, you’ll be able to get very accurate weight measurements. This can be handy for creating your own industrial scale, process control or simple presence detection. This version of the SparkFun Load Cell Amplifier features a few changes that you specifically asked for! We have separated the analog and digital supply, as well as added a 3.3uH inductor and a 0.1uF filter capacitor for digital supply. The HX711 uses a two-wire interface (Clock and Data) for communication. Any microcontroller’s GPIO pins should work, and numerous libraries have been written, making it easy to read data from the HX711. Load cells use a four-wire Wheatstone bridge configuration to connect to the HX711. These are commonly colored RED, BLK, WHT, GRN and YLW. Each color corresponds to the conventional color coding of load cells: Red (Excitation+ or VCC) Black (Excitation- or GND) White (Amplifier+, Signal+ or Output+) Green (A-, S- or O-) Yellow (Shield) The YLW pin acts as an optional input that is not hooked up to the strain gauge but is utilized to ground and shield against outside EMI (electromagnetic interference). Please keep in mind that some load cells might have slight variations in color coding. Features: Operation Voltage: 2.7V–5V Operation Current: < 1.5mA Selectable 10SPS or 80SPS output data rate Simultaneous 50 and 60Hz supply rejection

858 Downloads | 268 Likes | 08.08.2017

SparkFun ESP32 Thing by SparkFun Electronics

Autodesk EAGLE Design Block Description: The SparkFun ESP32 Thing is a comprehensive development platform for Espressif’s ESP32, their super-charged version of the popular ESP8266. Like the 8266, the ESP32 is a WiFi-compatible microcontroller, but to that, it adds support for Bluetooth low-energy (i.e BLE, BT4.0, Bluetooth Smart), and nearly 30 I/O pins. The ESP32’s power and versatility will make it the foundation of IoT and connected projects for many years to come. Why the name? We lovingly call it the “Thing” because it’s the perfect foundation for your Internet of Things project. The Thing does everything from turning on an LED to posting data with phant.io and can be programmed just like any microcontroller. You can even program the Thing through the Arduino IDE by installing the ESP32 Arduino Core. The SparkFun ESP32 Thing equips the ESP32 with everything necessary to program, run and develop on the wonderchip. In addition to the WiFi/BLE SoC, the Thing includes an FTDI FT231x, which converts USB to serial, and allows your computer to program and communicate with the microcontroller. It also features a LiPo charger, so your ESP32 project can be battery-powered and truly wireless. Additionally, the board includes a handful of LEDs and buttons to aid in your development. Features: Dual-core Tensilica LX6 microprocessor Up to 240MHz clock frequency 520kB internal SRAM Integrated 802.11 BGN WiFi transceiver Integrated dual-mode Bluetooth (classic and BLE) 2.2 to 3.6V operating range 2.5 µA deep sleep current 28 GPIO 10-electrode capacitive touch support Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096) 4MB Flash memory Integrated LiPo Battery Charger

698 Downloads | 205 Likes | 08.08.2017

SparkFun EasyDriver - Stepper Motor Driver by SparkFun Electronics

Autodesk EAGLE Design Block Description: The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). The EasyDriver requires a 6V to 30V supply to power the motor and can power any voltage of stepper motor. The EasyDriver has an on board voltage regulator for the digital interface that can be set to 5V or 3.3V. Connect a 4-wire stepper motor and a microcontroller and you’ve got precision motor control! EasyDriver drives bi-polar motors, and motors wired as bi-polar. I.e. 4,6, or 8 wire stepper motors. This EasyDriver V4.5 has been co-designed with Brian Schmalz. It provides much more flexibility and control over your stepper motor, when compared to older versions. The microstep select (MS1 and MS2) pins of the A3967 are broken out allowing adjustments to the microstepping resolution. The sleep and enable pins are also broken out for further control. Features: A3967 Microstepping Driver MS1 and MS2 pins broken out to change microstepping resolution to full, half, quarter and eighth steps (defaults to eighth) Compatible with 4, 6, and 8 wire stepper motors of any voltage Adjustable current control from 150mA/phase to 700mA/phase Power supply range from 6V to 30V. The higher the voltage, the higher the torque at high speeds

929 Downloads | 212 Likes | 08.08.2017

nFR52832 QFAA QFN48 with DC/DC regulator and NFC setup by Nordic Semiconductor

Autodesk EAGLE Design Block The nRF52832 SoC is a powerful, highly flexible ultra-low power multiprotocol SoC ideally suited for Bluetooth® low energy (previously called Bluetooth Smart), ANT and 2.4GHz ultra low-power wireless applications. The nRF52832 SoC is built around a 32-bit ARM® Cortex™-M4F CPU with 512kB + 64kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51 Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.

549 Downloads | 268 Likes | 08.08.2017

nFR52832 QFAA QFN48 with DC/DC regulator setup by Nordic Semiconductor

Autodesk EAGLE Design Block The nRF52832 SoC is a powerful, highly flexible ultra-low power multiprotocol SoC ideally suited for Bluetooth® low energy (previously called Bluetooth Smart), ANT and 2.4GHz ultra low-power wireless applications. The nRF52832 SoC is built around a 32-bit ARM® Cortex™-M4F CPU with 512kB + 64kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51 Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.

541 Downloads | 301 Likes | 08.08.2017

nFR52832 QFAA QFN48 with internal LDO setup by Nordic Semiconductor

Autodesk EAGLE Design Block The nRF52832 SoC is a powerful, highly flexible ultra-low power multiprotocol SoC ideally suited for Bluetooth® low energy (previously called Bluetooth Smart), ANT and 2.4GHz ultra low-power wireless applications. The nRF52832 SoC is built around a 32-bit ARM® Cortex™-M4F CPU with 512kB + 64kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51 Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.

517 Downloads | 288 Likes | 08.08.2017