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。Description。Add another eight pins to your microcontroller using a MCP23008 port expander. The MCP23008 uses two I2C pins which can be shared with other I2C devices， and in exchange gives you eight general purpose pins. You can set each of eight pins to be input， output， or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs change so you don't have to keep polling the chip.。Use this chip from 2.7-5.5V(good for any 3.3V or 5V setup)， and you can sink/source up to 20mA from any of the I/O pins so this will work for LEDs and such. Team it up with a high-power MOSFET if you need more juice. DIP package means it will plug into any breadboard or perfboard.。You can set the I2C address by tying the ADDR0-2 pins to power or ground， for up to eight unique addresses. That means eight chips can share a single I2C bus - that's 64 I/O pins!。Features。8-bit remote bidirectional I/O port。High-speed I2C interface(MCP23008)。Hardware address pins。Configurable interrupt output pin。Configurable interrupt source。Polarity Inversion register for input port data polarity config.。External reset input。Low standby current：1 μA(max.)・ Operating voltage：。1.8V to 5.5V @ -40℃ to +85℃ I2C @ 100 kHz SPI @ 5 MHz。2.7V to 5.5V @ -40℃ to +85℃ I2C @ 400 kHz SPI @ 10 MHz。4.5V to 5.5V @ -40℃ to +125℃ I2C @ 1.7 kHz SPI @ 10 MHz

Description。Keypads are very handy input devices， but who wants to tie up seven GPIO pins， wire up handful of pull-up resistors， and write firmware that wastes valuable processing time scanning the keys for inputs? The SparkFun Qwiic Keypad comes fully assembled and makes the development process for adding 12 button keypad easy. No voltage translation or figuring out which I2C pin is SDA or SCL， just plug and go! Utilizing our handy Qwiic system， 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 breadboard.。Each of the keypad's 12 buttons has been labeled 1， 2， 3， 4， 5， 6， 7， 8， 9， 0， *， and and has been formatted to into the same layout as telephone keypad with each keypress resistance ranging between 10 and 150 Ohms. The Qwiic Keypad reads and stores the last 15 button presses in First-In， First-Out(FIFO)stack， so you don't need to constantly poll the keypad from your microcontroller. This information， then， is accessible through the Qwiic interface. The SparkFun Qwiic Keypad even has software configurable I2C address so you can have multiple I2C devices on the same bus.。NOTE：The I2C address of the Qwiic Keypad is 0x4B and is jumper selectable to 0x4A(software-configurable to any address). multiplexer/Mux is required to communicate to multiple Qwiic Keypad sensors on single bus. If you need to use more than one Qwiic Keypad sensor consider using the Qwiic Mux Breakout.。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 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 Keypad Hookup Guide。Features。Software Selectable Slave Address。Low Power ATtiny85 controller。Button Presses w/ Time Stamp。Default I2C Address：0x4B。2x Qwiic Connector

Description。Cherry MX Keyswitches are top-of-the-line mechanical keyboard switches. They're satisfyingly "clicky"， reliable up to tens-of-millions of key presses， and a standard in gaming and programming keyboards across the globe. With the SparkFun Cherry MX Switch Breakout we have made the switches more easily adaptable to breadboard or perfboard-based projects. The Cherry MX Switch Breakout is a perfect prototyping tool for projects ranging from a single-key user-input to fully-custom 101-key keyboards.。In addition to breaking out the switch contacts to breadboard-compatible headers， the Cherry MX Switch Breakout also provides access to an optional switch-mounted LED. Plus， the pin break-outs are designed with keyboard matrix-ing in mind， so you can interconnect as many boards as you'd like into a row-column configuration， keeping the I/O-pin requirements as low as possible.。Note：If you are looking for a Cherry MX Switch to use with this breakout， we've got you covered! CLICK HERE!。Get Started with the Cherry MX Switch Guide。Features。Support for 3mm LED。Footprint for LED current-limiting resistor。Footprint for switch-isolating diode。Chain-able in row/column matrices。Designed to match standard key spacing and keyboard row offsets

Description。This sealed digital temperature probe lets you precisely measure temperatures in wet environments with a simple 1-Wire interface. The DS18B20 provides 9 to 12-bit(configurable)temperature readings over a 1-Wire interface， so that only one wire(and ground)needs to be connected from a central microprocessor. Power for reading， writing， and performing temperature conversions can be derived from the data line itself with no need for an external power source.。Because each DS18B20 contains a unique silicon serial number， multiple DS18B20s can exist on the same 1-Wire bus. This allows for placing temperature sensors in many different places. Applications where this feature is useful include HVAC environmental controls， sensing temperatures inside buildings， equipment or machinery， and process monitoring and control.。Note：The pinout for this sensor is as follows：RED=Vcc BLACK=GND WHITE=SIG。Features。3.0-5.5V input voltage。-55℃ to +125℃ temperature range。±0.5℃ accuracy from -10℃ to +85℃。Waterproof。1 Wire interface。Probe is 7mm in diameter and roughly 26mm long. Overall length(including wire)is 6 feet.。Thermometer resolution is programmable from 9 to 12 bits.。Electrical performance：no flicker or breakdown within AC 1200V/1S ，within DC 500V theinsulation resistance shall be greater than 100MΩ

Description。The LilyPad Sewable Electronics Kit lets you explore the wonderful world of electronic sewing(e-sewing)and e-textiles through a series of introductory projects using the LilyPad system. You'll learn how to sew basic circuits to light up LEDs， control them with buttons and switches and even experiment with a pre-programmed LilyMini circuit that reacts to ambient light levels. In addition to LilyPad LEDs and battery holders， the kit comes with two LilyPad ProtoSnap boards that let you explore the circuit before you sew the pieces into a project.。The full-color LilyPad Sewable Electronics Kit Guide(included)contains step-by-step instructions for using LilyPad pieces to create four complete sewable circuit projects with conductive thread. Easy-to-follow diagrams and troubleshooting tips make this a great introductory resource for crafters and creatives.。LilyPad is a wearable technology developed by Dr. Leah Buechley and cooperatively designed by Dr. Buechley and SparkFun. Each LilyPad component was creatively constructed with large sew tabs to allow for stitching into clothing. Various input， output， power and sensor boards are available. They're even washable!。Note：A portion of this sale is given back to Dr. Buechley for continued development and education in e-textiles.。Note：Due to the requirements of shipping the batteries in this kit， orders may take longer to process and therefore do not qualify for same-day shipping. Additionally， these batteries can not be shipped via Ground or Economy methods to Alaska or Hawaii. Sorry for any inconvenience this may cause.。Examples。Sewable Electronics Projects：Project 1：Glowing Pin。Project 2：Illuminated Mask。Project 3：Light-Up Plush。Project 4：Night-Light Pennant