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Description。The SparkFun Qwiic HAT for Raspberry Pi is the quickest and easiest way to enter into SparkFun's Qwiic ecosystem while still using that Raspberry Pi that you've come to know and love. The Qwiic HAT connects the I2C bus(GND， 3.3V， SDA and SCL)on your Raspberry Pi to an array of Qwiic connectors on the HAT. Since the Qwiic system allows for daisy chaining boards with different addresses， you can stack as many sensors as you'd like to create a tower of sensing power!。The Qwiic Pi HAT has four Qwiic connect ports， all on the same I2C bus. In addition， many of the useful GPIO pins on the Raspberry Pi are broken out. This HAT is compatible with any Raspberry Pi that utilizes the standard 2x20 GPIO header. It has been designed to sit to the side of the Pi， allowing it to work conveniently with a Pi Tin enclosure to connect boards to the Qwiic ports.。Note：。There is a small silk error that has reversed the SDA and SCL. This is simply a cosmetic mix-up and will not impact any function with this 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 SparkFun Qwiic Pi HAT Guide。Features。4x Qwiic Connection Ports。Select GPIO Pins Broken Out。Pi Tin Compatibility

Description。Are you low on I/O? No problem! The SX1509 Breakout is 16-channel GPIO expander with an I2C interface that means with just two wires， your microcontroller can interface with 16 fully configurable digital input/output pins. But the SX1509 can do so much more than just simple digital pin control. It can produce PWM signals， so you can dim LEDs. It can be set to blink or even breathe pins at varying rates. This breakout is similar to multiplexer or "mux，" in that it allows you to get more IO from less pins. And， with built-in keypad engine， it can interface with up to 64 buttons set up in an 8x8 matrix.。Two headers at the top and bottom of the breakout board function as the input and control headers to the board. This is where you can supply power to the SX1509， and where your I2C signals SDA and SCL will terminate. GPIO and power buses are broken out in every-which direction， and configurable jumpers cover most of the rest of the board.。Since the I/O banks can operate between 1.2V and 3.6V(5.5V tolerant)independent of both the core and each other， this device can also work as level-shifter. The SX1509 breakout makes it easy to prototype so you can add more I/O onto your Arduino or I/O limited controller. We've even spun up an Arduino Library to get you started!。Features。Enable Direct Level Shifting Between I/O Banks and Host Controller。5.5V Tolerant I/Os， Up to 15mA Output Sink on All I/Os。Integrated LED Driver with Intensity Control。On-Chip Keypad Scanning Engine Supports Up to 8x8 Matrix(64 Keys)。16 Channels of True Bi-directional Style I/O。400kHz I2C Compatible Slave Interface