When you experiment with the Raspberry Pi on a regular basis and you connect a variety of external hardware to the GPIO port via the header you may well have caused some damage in the past. The Elektor Raspberry Pi Buffer Board is there to prevent this! The board is compatible with Raspberry Pi Zero, Zero 2 (W), 3, 4, 5, 400 and 500. All 26 GPIOs are buffered with bi-directional voltage translators to protect the Raspberry Pi when experimenting with new circuits. The PCB is intended to be inserted in the back of Raspberry Pi 400/500. The connector to connect to the Raspberry Pi is a right angled 40-way receptacle (2x20). The PCB is only a fraction wider. A 40-way flat cable with appropriate 2x20 headers can be connected to the buffer output header to experiment for instance with a circuit on a breadboard or PCB. The circuit uses 4x TXS0108E ICs by Texas Instruments. The PCB can also be put upright on a Raspberry Pi. Downloads Schematics Layout

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NRF24L01 is a universal ISM band monolithic transceiver chip works in the 2.4-2.5 GHz. Features Wireless transceiver including: Frequency generator, enhanced type, SchockBurstTM, mode controller, power amplifier, crystal amplifier, modulator, demodulator The output power channel selection and protocol settings can be set extremely low current consumption, through the SPI interface As the transmit mode, the transmit power is 6 dBm, the current is 9.0 mA, the accepted mode current is 12.3 mA, the current consumption of the power-down mode and standby mode are lower Built-in 2.4 GHz antenna, supports up to six channels of data reception Size: 15 x 29 mm (including antenna)

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This module includes an integrated trace antenna, fits the IC to an FCC-approved footprint, and includes decoupling and timing mechanisms that would need to be designed into a circuit using the bare nRF52840 IC. The Bluetooth transceiver included on the nRF52840 boasts a BT 5.1 stack. It supports Bluetooth 5, Bluetooth mesh, IEEE 802.15.4 (Zigbee & Thread) and 2.4Ghz RF wireless protocols (including Nordic's proprietary RF protocol) allowing you to pick which option works best for your application. Features ARM Cortex-M4 CPU with a floating-point unit (FPU) 1MB internal Flash -- For all of your program, SoftDevice, and file-storage needs! 256kB internal RAM -- For your stack and heap storage. Integrated 2.4GHz radio with support for: Bluetooth Low Energy (BLE) -- With peripheral and/or central BLE device support Bluetooth 5 -- Mesh Bluetooth! ANT -- If you want to turn the device into a heart-rate or exercise monitor. Nordic's proprietary RF protocol -- If you want to communicate, securely, with other Nordic devices. Every I/O peripheral you could need. USB -- Turn your nRF52840 into a USB mass-storage device, use a CDC (USB serial) interface, and more. UART -- Serial interfaces with support for hardware flow-control if desired. I²C -- Everyone's favourite 2-wire bi-directional bus interface SPI -- If you prefer the 3+-wire serial interface Analogue-to-digital converters (ADC) -- Eight pins on the nRF52840 Mini Breakout support analogue inputs PWM -- Timer support on any pin means PWM support for driving LEDs or servo motors. Real-time clock (RTC) -- Keep close track of seconds and milliseconds, also supports timed deep-sleep features. Three UARTs Primary tied to USB interface. Two hardware UARTs. Two I²C Buses Two SPI Buses Secondary SPI Bus primarily used for Flash IC. PDM Audio Processing Two Analog Inputs Two Dedicated Digital I/O Pins Two Dedicated PWM Pins Eleven General Purpose I/O Pins

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The Data Logging Carrier Board breaks out connections for I²C via a Qwiic connector or standard 0.1'-spaced PTH pins along with SPI and serial UART connections for logging data from peripheral devices using those communication protocols. The Data Logging Carrier Board allows you to control power to both the Qwiic connector on the board and a dedicated 3.3 V power rail for non-Qwiic peripherals so you can pick and choose when to power the peripherals you are monitoring the data from. It also features a charging circuit for single-cell Lithium-ion batteries along with a separate RTC battery-backup circuit to maintain power to a real-time clock circuit on your Processor Board. Features M.2 MicroMod Connector microSD socket USB-C Connector 3.3 V 1 A Voltage Regulator Qwiic Connector Boot/Reset Buttons RTC Backup Battery & Charge Circuit Independent 3.3 V regulators for Qwiic bus and peripheral add-ons Controlled by digital pins on Processor Board to enable low power sleep modes Phillips #0 M2.5 x 3 mm screw included

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Voice recognition, always-on voice commands, gesture, or image recognition are possible with TensorFlow applications. The cloud is impressively robust, but all-the-time connection requires power and connectivity that may not be available. Edge computing handles discrete tasks such as determining if someone said 'yes' and responds accordingly. The audio analysis is done on the MicroMod combination rather than on the web. This dramatically reduces costs and complexity while limiting potential data privacy leaks. This board features two MEMS microphones (one with a PDM interface, one with an I²S interface), an ST LIS2DH12 3-axis accelerometer, a connector to interface to a camera (sold separately), and a Qwiic connector. A modern USB-C connector makes programming easy and we've exposed the JTAG connector for more advanced users who prefer to use the power and speed of professional tools. We've even added a convenient jumper to measure current consumption for low power testing. Features M.2 MicroMod Keyed-E H4.2mm 65 pins SMD Connector 0.5mm Digital I²C MEMS Microphone PDM Invensense ICS-43434 (COMP) Digital PDM MEMS Microphone PDM Knowles SPH0641LM4H-1 (IC) ML414H-IV01E Lithium Battery for RTC ST LIS2DH12TR Accelerometer (3-axis, ultra-low-power) 24 Pin 0.5mm FPC Connector (Himax camera connector) USB-C Qwiic connector MicroSD socket Phillips #0 M2.5x3mm screw included

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The SparkFun Thing Plus Matter is the first easily accessible board of its kind that combines Matter and SparkFun’s Qwiic ecosystem for agile development and prototyping of Matter-based IoT devices. The MGM240P wireless module from Silicon Labs provides secure connectivity for both 802.15.4 with Mesh communication (Thread) and Bluetooth Low Energy 5.3 protocols. The module comes ready for integration into Silicon Labs' Matter IoT protocol for home automation. What is Matter? Simply put, Matter allows for consistent operation between smart home devices and IoT platforms without an Internet connection, even from different providers. In doing so, Matter is able to communicate between major IoT ecosystems in order to create a single wireless protocol that is easy, reliable, and secure to use. The Thing Plus Matter (MGM240P) includes Qwiic and LiPo battery connectors, and multiple GPIO pins capable of complete multiplexing through software. The board also features the MCP73831 single-cell LiPo charger as well as the MAX17048 fuel gauge to charge and monitor a connected battery. Lastly, a µSD card slot for any external memory needs is integrated. The MGM240P wireless module is built around the EFR32MG24 Wireless SoC with a 32-bit ARM Cortext-M33 core processor running at 39 MHz with 1536 kb Flash memory and 256 kb RAM. The MGM240P works with common 802.15.4 wireless protocols (Matter, ZigBee, and OpenThread) as well as Bluetooth Low Energy 5.3. The MGM240P supports Silicon Labs' Secure Vault for Thread applications. Specifications MGM240P Wireless Module Built around the EFR32MG24 Wireless SoC 32-bit ARM-M33 Core Processor (@ 39 MHz) 1536 kB Flash Memory 256 kB RAM Supports Multiple 802.15.4 Wireless Protocols (ZigBee and OpenThread) Bluetooth Low Energy 5.3 Matter-ready Secure Vault Support Built-in Antenna Thing Plus Form-Factor (Feather-compatible): Dimensions: 5.8 x 2.3 cm (2.30 x 0.9') 2 Mounting Holes: 4-40 screw compatible 21 GPIO PTH Breakouts All pins have complete multiplexing capability through software SPI, I²C and UART interfaces mapped by default to labeled pins 13 GPIO (6 labeled as Analog, 7 labeled for GPIO) All function as either GPIO or Analog Built-in-Digital to Analog Converter (DAC) USB-C Connector 2-Pin JST LiPo Battery Connector for a LiPo Battery (not included) 4-Pin JST Qwiic Connector MC73831 Single-Cell LiPo Charger Configurable charge rate (500 mA Default, 100 mA Alternate) MAX17048 Single-Cell LiPo Fuel Gauge µSD Card Slot Low Power Consumption (15 µA when MGM240P is in Low Power Mode) LEDs: PWR – Red Power LED CHG – Yellow battery charging status LED STAT – Blue status LED Reset Button: Physical push-button Reset signal can be tied to A0 to enable use as a peripheral device Downloads Schematic Eagle Files Board Dimensions Hookup Guide Datasheet (MGM240P) Fritzing Part Thing+ Comparison Guide Qwiic Info Page GitHub Hardware Repo

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The Power Delivery Board uses a standalone controller to negotiate with the power adapters and switch to a higher voltage other than just 5V. This uses the same power adapter for different projects rather than relying on multiple power adapters to provide different output; it can deliver the board as part of SparkFun’s Qwiic connect system, so you won’t have to do any soldering to figure out how things are oriented. The SparkFun Power Delivery Board takes advantage of the power delivery standard using a standalone controller from STMicroelectronics, the STUSB4500. The STUSB4500 is a USB power delivery controller that addresses sink devices. It implements a proprietary algorithm to negotiate a power delivery contract with a source (i.e. a power delivery wall wart or power adapter) without the need for an external microcontroller. However, you will need a microcontroller to configure the board. PDO profiles are configured in an integrated non-volatile memory. The controller does all the heavy lifting of power negotiation and provides an easy way to configure over I²C. To configure the board, you will need an I²C bus. The Qwiic system makes it easy to connect the Power Delivery board to a microcontroller. Depending on your application, you can also connect to the I²C bus via the plated through SDA and SCL holes. Features Input and output voltage range of 5-20V Output current up to 5A Three configurable power delivery profiles Auto-run Type-C™ and USB PD sink controller Certified USB Type-C™ rev 1.2 and USB PD rev 2.0 (TID #1000133) Integrated VBUS voltage monitoring Integrated VBUS switch gate drivers (PMOS)

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This carrier board combines a 2.4" TFT display, six addressable LEDs, onboard voltage regulator, a 6-pin IO connector, and microSD slot with the M.2 pin connector slot so that it can be used with compatible processor boards in our MicroMod ecosystem. We've also populated this carrier board with Atmel's ATtiny84 with 8kb of programmable flash. This little guy is pre-programmed to communicate with the processor over I²C to read button presses. Features M.2 MicroMod Connector 240 x 320 pixel, 2.4" TFT display 6 Addressable APA102 LEDs Magnetic Buzzer USB-C Connector 3.3 V 1 A Voltage Regulator Qwiic Connector Boot/Reset Buttons RTC Backup Battery & Charge Circuit microSD Phillips #0 M2.5 x 3 mm screw included

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Features Integrated Cold-Junction Compensation Supported Types (designated by NIST ITS-90): Type K, J, T, N, S, E, B and R Four Programmable Temperature Alert Outputs: Monitor Hot- or Cold-Junction Temperatures Detect rising or falling temperatures Up to 255°C of Programmable Hysteresis Programmable Digital Filter for Temperature Low Power Dimensions: 20 mm x 40 mm x 18 mm Weight: 18 g Application Petrochemical Thermal Management Hand-Held Measurement Equipment Industrial Equipment Thermal Management Ovens Industrial Engine Thermal Monitor Temperature Detection Racks Downloads Eagle Files Github library Datasheet

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The SparkFun MicroMod mikroBUS Carrier Board takes advantage of the MicroMod, Qwiic, and mikroBUS ecosystems making it easy to rapidly prototype with each of them, combined. The MicroMod M.2 socket and mikroBUS 8-pin header provide users the freedom to experiment with any Processor Board in the MicroMod ecosystem and any Click board in the mikroBUS ecosystem, respectively. This board also features two Qwiic connectors to seamlessly integrate hundreds of Qwiic sensors and accessories into your project. The mikroBUS socket comprises a pair of 8-pin female headers with a standardized pin configuration. The pins consist of three groups of communications pins (SPI, UART and I²C), six additional pins (PWM, Interrupt, Analog input, Reset and Chip select), and two power groups (3.3 V and 5 V). While a modern USB-C connector makes programming easy, the Carrier Board is also equipped with a MCP73831 Single-Cell Lithium-Ion/Lithium-Polymer Charge IC so you can charge an attached single-cell LiPo battery. The charge IC receives power from the USB connection and can source up to 450 mA to charge an attached battery. Features M.2 MicroMod (Processor Board) Connector USB-C Connector 3.3 V 1 A Voltage Regulator 2x Qwiic Connectors mikroBUS Socket Boot/Reset Buttons Charge Circuit JTAG/SWD PTH Pins Downloads Schematic Eagle Files Board Dimensions Hookup Guide Getting Started with Necto Studio mikroBUS Standard Qwiic Info Page GitHub Hardware Repo

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Waveshare DVK600 is an FPGA CPLD mother board that features expansion connectors for connecting FPGA CPLD core board and accessory boards. DVK600 provides an easy way to set up FPGA CPLD development system. Features FPGA CPLD core board connector: for easily connecting core boards which integrate an FPGA CPLD chip onboard 8I/Os_1 interface, for connecting accessory boards/modules 8I/Os_2 interface, for connecting accessory boards/modules 16I/Os_1 interface, for connecting accessory boards/modules 16I/Os_2 interface, for connecting accessory boards/modules 32I/Os_1 interface, for connecting accessory boards/modules 32I/Os_2 interface, for connecting accessory boards/modules 32I/Os_3 interface, for connecting accessory boards/modules SDRAM interface for connecting SDRAM accessory board also works as FPGA CPLD pins expansion connectors LCD interface, for connecting LCD22, LCD12864, LCD1602 ONE-WIRE interface: easily connects to ONE-WIRE devices (TO-92 package), such as temperature sensor (DS18B20), electronic registration number (DS2401), etc. 5 V DC jack Joystick: five positions Buzzer Potentiometer: for LCD22 backlight adjustment, or LCD12864, LCD1602 contrast adjustment Power switch Buzzer jumper ONE-WIRE jumper Joystick jumper Downloads Schematics

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The MLX90640 SparkFun IR Array Breakout features a 32×24 array of thermopile sensors generating, in essence, a low resolution thermal imaging camera. With this breakout you can observe surface temperatures from a decent distance away with an accuracy of ±1.5°C (best case). This board communicates via I²C using the Qwiic system developed by Sparkfun, which makes it easier to operate the breakout. However, there are still 0.1'-spaced pins in case you favour using a breadboard. The SparkFun Qwiic connect system is an ecosystem of I²C sensors, actuators, shields and cables that make prototyping faster and helps you avoid errors. All Qwiic-enabled boards use a common 1 mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections help you connect everything correctly. This specific IR Array Breakout provides a 110°×75° field of view with a temperature measurement range of -40~300°C. The MLX90640 IR Array has pull up resistors attached to the I²C bus; both can be removed by cutting the traces on the corresponding jumpers on the back of the board. Please be aware that the MLX90640 requires complex calculations by the host platform so a regular Arduino Uno (or equivalent) doesn't have enough RAM or flash to complete the complex computations required to turn the raw pixel data into temperature data. You will need a microcontroller with 20,000 bytes or more of RAM.

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