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Transistor - NPN (BC547)
Retail: $1.00
Price: $0.83
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Sparkfun Item #: COM-08928 -

"These are high quality BJT NPN transistors that work well with audio applications, made by ST Micro. Datasheet: BC547"

Op-Amp (Thru-Hole) - LM358
Price: $1.58
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Sparkfun Item #: COM-09456 -

"The LM358 is a great, easy-to-use dual-channel opamp. Opamps have so many applications we figured we should probably carry at least one in a DIP package. LM358 applications include transducer amplifiers, DC gain blocks and all the conventional opamp circuits. If you’re looking for a good, standard opamp the LM358 should fill most of your needs. It can handle a supply of 3-32VDC and source up to 20mA per channel. This opamp is great if you need to operate two individual opamps from a...

N-Channel MOSFET 60V 30A
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Price: $1.53
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Sparkfun Item #: COM-10213 -

"If you’ve ever wondered how to control the headlight of a car from a microcontroller, a MOSFET is what you need. This is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with any 3-5V microcontroller or mechanical switch. This allows you to control high-power devices with very low-power control mechanisms. Note: We stock two different models of this component, the two are nearly identical and can be used interchangeably....

Voltage Regulator - 5V
Price: $1.58
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Sparkfun Item #: COM-00107 -

"This is the basic L7805 voltage regulator, a three-terminal positive regulator with a 5V fixed output voltage. This fixed regulator provides a local regulation, internal current limiting, thermal shut-down control, and safe area protection for your project. Each one of these voltage regulators can output a max current of 1.5A. Features: Output Voltage: 5V Output Current: 1.5A Thermal Overload Protection Short Circuit Protection Output Transition SOA Protection Documents: Datasheet Fixed Power...

Shift Register 8-Bit - SN74HC595
Price: $1.58
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Sparkfun Item #: COM-13699 -

"The SN74HC595N is a simple 8-bit shift register IC. Simply put, this shift register is a device that allows additional inputs or outputs to be added to a microcontroller by converting data between parallel and serial formats. Your chosen microprocessor is able to communicate with the The SN74HC595N using serial information then gathers or outputs information in a parallel (multi-pin) format. Essentially it takes 8 bits from the serial input and then outputs them to 8 pins. This small DIP...

Full-Bridge Motor Driver Dual - L298N
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Price: $4.76
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Sparkfun Item #: COM-09479 -

"The LN298 is a high voltage, high current, dual full-bridge motor driver designed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Comes in a staggered, 15-lead Multiwatt package. Check below for a breakout board. Features: Operating supply voltage of up to 46V 4.5-7VDC logic supply voltage Total DC current of up to 4A Low saturation voltage Over-temperature protection Logical ‘0’ input up to 1.5V (high-noise...

H-Bridge Motor Driver 1A
Price: $3.92
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Sparkfun Item #: COM-00315 -

"Faster, cheaper, smaller, better, right? The SN754410 Quad Half H-Bridge is just that. Capable of driving high voltage motors using TTL 5V logic levels, the SN754410 can drive 4.5V up to 36V at 1A continuous output current! Please see datasheet for more information. This is a pin to pin compatible replacement for the L293D. Datasheets: SN754410"

555 Timer
Price: $1.58
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Sparkfun Item #: COM-09273 -

"This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED, generate tone, and thousands of other great beginning projects. Google around for a huge list of resources and example projects. Features: 4.5V to 16V supply 8-pin DIP package Timing from microseconds to hours Astable or monostable operation Adjustable duty cycle TTL compatible output Sink or source up to 200mA Documents:Datasheet" ...

Barometric Pressure Sensor - BMP180
Price: $9.49
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Sparkfun Item #: COM-11823 -

"The BMP180 is a high-precision, ultra-low power digital barometer. It offers a measuring range of 300 to 1100 hPa with an absolute accuracy of down to 0.02 hPa. The BMP185 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability. What makes this sensor great is that it is nearly identical to its former rev, the BMP085! This sensor supports a voltage supply between 1.8 and 3.6VDC. It is designed to be connected directly to a...

Analog to Digital Converter - MCP3002
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Price: $3.83
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Sparkfun Item #: COM-08636 -

"The MCP3002 has a 10-bit analog to digital converter (ADC) with a simple to use SPI interface. Use this IC if your microcontroller does not have an ADC or have enough ADC lines. A great chip when you need to add additional ADC lines. Features: 2.7V to 5.5V supply 10-bit resolution 8-pin DIP package 3 wire SPI interface Up to 75,000 samples per second Low power shutdown Documents:Datasheet" ...

Voltage Regulator - Adjustable
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Price: $3.15
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Sparkfun Item #: COM-00527 -

"This is the LM317TG voltage regulator, a three-terminal positive regulator with a 1.2V to 37V adjustable output voltage. This adjustable regulator provides a local regulation, internal current limiting, thermal shut-down control, and safe area protection for your project. Did we mention that this guy is easy to use? It only requires two external resistors to set the output voltage. Each one of these voltage regulators can output a max current of 1.5A. Features: Output Voltage: 1.2V - 37V...

Step Up/Down Inverting Switching Regulator
Price: $3.16
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Sparkfun Item #: COM-00317 -

"DC to DC converter/regulator MC34063A. Has an input range of 3V to 40V, output switch current of up to 1.5 amp. Step up, step down and invert capability. This is the unit we used in the high voltage ringer circuit for the port-o-rotary phone! Documents:MC34063 Datasheet"

16 Channel Multiplexer
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Price: $1.53
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Sparkfun Item #: COM-00299 -

"Texas Instruments CD74HC4067 16-Channel multiplexer. What can you do with it? How about taking an analog to digital reading from 16 devices with only 1 ADC channel and 4 control pins. That’s right, 16 for the price of 5! 24-Pin SSOP package. Works great with our 28-Pin SSOP to DIP adapters. Documents: Datasheet bildr blog - CD74HC4067 " ...

2.4GHz Transceiver IC - nRF24L01+
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Price: $5.65
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Sparkfun Item #: COM-00690 -

"Nordic Semiconductor nRF24L01+. Transceiver chip operating in the 2.4GHz band. Take all the coolness of the nRF2401A and add some extra pipelines, buffers, and an auto-retransmit feature - very nice! The improved ‘+’ version of the nRF24L01 includes more features and better range! Features: Drop in compatible with nRF24L01 1.9V-3.6V supply 2Mbit data rate New long range 250kbit option Auto acknowledge Auto re-transmit Multiceiver - 6 data pipes 32 byte separate TX and RX FIFOs 5V...

3-Axis Gyro/Accelerometer IC - MPU-6050
Price: $22.19
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Sparkfun Item #: SEN-10937 -

"The MPU-6050 is a serious little piece of motion processing tech! By combining a MEMS 3-axis gyroscope and a 3-axis accelerometer on the same silicon die together with an onboard Digital Motion Processor™ (DMP™) capable of processing complex 9-axis MotionFusion algorithms, the MPU-6050 does away with the cross-axis alignment problems that can creep up on discrete parts. The parts’ integrated 9-axis MotionFusion algorithms can even access external magnetometers or other...

ALS-PT19 Light Sensor
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Price: $1.53
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Sparkfun Item #: SEN-12566 -

"This tiny little guy is the ALS-PT19, an SMD ambient light sensor that is much smaller than the standard TEMT6000. The ALS-PT19 is capable of taking a voltage supply range of 2.5V to 5.5V and also functions as an NPN transistor. If you are looking for a small and easy to use light sensor, definitely pick up the ALS-PT19! Documents: Datasheet " ...

Ambient Light Sensor - TEMT6000
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Price: $2.42
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Sparkfun Item #: COM-08348 -

"This is a small ambient light sensor that acts as an NPN transistor. The more the sensor is exposed to light, the stronger the base bias. Simple to use! Simple breakout board available below. Documents: Datasheet "

ATMega2561
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Price: $19.29
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Sparkfun Item #: COM-12906 -

"The ATMega2561 is one of Atmel’s low-power 8-bit AVR RISC-based microcontrollers. This SMD microcontroller features 256KB self-programming flash program memory, 8KB SRAM, 4KB EEPROM, 54 general purpose I/O pins, 8-channel 10-bit A/D-converter, and JTAG interface for on-chip-debug. This is the same controller that was used to be used on our Wiring Board. Documents: Datasheet " ...

ATMEGA8U2-AU
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Price: $3.70
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Sparkfun Item #: COM-13703 -

"The ATMEGA8U2-AU is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATMEGA8U2 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two...

Barometric Pressure Sensor - MPL115A1
Price: $8.25
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Sparkfun Item #: SEN-09602 -

"The MPL115A1 is a digital barometer that uses MEMs technology to give accurate pressure measurements between 50kPa and 115kPa. We stock the SPI interface version of the sensor. Average current consumption is 10µA at one measurement per second. The sensor outputs both temperature and pressure readings on the SPI bus. See page 3 of the datasheet for information on how to take readings from the pressure sensor. Breakout board coming soon! Features: Wide supply voltage range -40°C to...

Darlington Driver 8-Channel ULN2803 DIP
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Price: $3.15
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Sparkfun Item #: COM-00312 -

"8 Darlington Arrays in 18-Pin DIP Package part # ULN2803A. Perfect for running relays and high-power devices up to 500mA and up to 50V! Documents: Datasheet Connecting ULN2803 to Arduino Controlling High Power Circuits with Arduino and ULN2803 " ...

Dot/Bar Display Driver - LM3914 (Linear)
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Price: $3.95
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Sparkfun Item #: COM-12694 -

"This is the LM3914 Dot/Bar display analog-controlled LED driver that uses an alinear output scale. With this driver all it takes is a single, analog signal to drive a string of 10+ LEDs, which can be configured into either bar mode (where all LEDs below a certain point turn on) or dot mode (with only a single LED on at a time). Hook them up properly, and you can create all sorts of nifty multi-LED displays. The LM3914 is very easy to apply as an analog meter circuit. A 1.2V full-scale meter...

Dual Axis Gyro - IDG1215
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Price: $39.54
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Sparkfun Item #: COM-09071 -

"The IDG-1215 is an integrated dual-axis angular rate sensor (gyroscope). It uses InvenSense’s proprietary and patented MEMS technology with vertically driven, vibrating masses to make a functionally complete, low-cost, dual-axis angular rate sensor. All required electronics are integrated onto a single chip with the sensor. The IDG-1215 gyro uses two sensor elements with novel vibrating dual-mass bulk silicon configurations that sense the rate of rotation about the X- and Y-axis...

Dual Axis Gyro - LPR503AL - 30 deg/s
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Price: $7.99
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Sparkfun Item #: COM-09446 -

"This is a low-power dual axis (pitch and roll) MEMS gyro with a ±30°/s maximum range. Options include integrated low pass filters and embedded power down and self-test features. Both x and y outputs are analog, and a 4x amplified output signal is also available for both axes. Comes in an LGA-16 package. Features: 2.7 to 3.6VDC supply Dual axis pitch and roll sensing ±30°/s output Low power consumption Wide operating temperature range (-40°C to +85°C) High...

Dual Axis Gyro - LPY503AL - 30 deg/s
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Price: $12.83
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Sparkfun Item #: COM-09447 -

"This is a low-power dual axis (pitch and yaw) MEMS gyro with a ±30°/s maximum range. Options include integrated low pass filters and embedded power down and self-test features. Both x and z outputs are analog, and a 4x amplified output signal is also available for both axes. Comes in an LGA-16 package. Features: 2.7 to 3.6VDC supply Dual axis pitch and yaw sensing ±30°/s output Low power consumption Wide operating temperature range (-40°C to +85°C) High stability...

Dual/Quad Power Amplifier - STA540
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Price: $8.07
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Sparkfun Item #: COM-09557 -

"The STA540 from STMicro is a 4-channel, class AB audio amplifier designed for high quality sound applications. The four independent channels makes this amplifier a great choice for a number of projects, with needs ranging from four speakers stereo (F/R) to two-speaker bridge solutions. The chip accepts a voltage supply ranging from 8 to 22VDC and has very high output power capability. This chip comes in a staggered-lead Multiwatt-15 package. While our breakout board for the L298N isn’t...

Graphic Equalizer Display Filter - MSGEQ7
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Price: $7.99
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Sparkfun Item #: COM-10468 -

"The seven band graphic equalizer IC is a CMOS chip that divides the audio spectrum into seven bands. 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz. The seven frequencies are peak detected and multiplexed to the output to provide a DC representation of the amplitude of each band. No external components are needed to select the filter responses. Only an off chip resistor and capacitor are needed to select the on chip clock oscillator frequency. The filter center frequencies track this...

Humidity and Temperature Sensor - SHT15
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Price: $46.73
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Sparkfun Item #: COM-08227 -

"This is a compact and easy to use relative humidity sensor from Sensirion. The SHT15 digital humidity and temperature sensor is fully calibrated and offers high precision and excellent long-term stability at low cost. The digital CMOSens Technology integrates two sensors and readout circuitry on one single chip. These sensors are really impressive! Very sensitive and straight forward to use. Features: 2 factory calibrated sensors for relative humidity & temperature Digital 2-wire...

I2C EEPROM - 256kbit
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Price: $3.15
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Sparkfun Item #: COM-00525 -

"2 Wire Serial Communication (I2C) EEPROM - The back bone of any microprocessor project. These 8 pin chips need only two wires to communicate and retain their data even with power failure. Use the 256K EEPROM for some serious data storage! Check out the Portuguese Arduino Tutorial and accompanying Windows App, by Daniel Gonçalves. Documents: Datasheet " ...

IR Reflectance Sensor - QRE1113
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Price: $3.15
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Sparkfun Item #: COM-09542 -

"The QRE1113 is a small IR reflectance sensor. This sensor is often used in line following robots because, if it can sense if a surface is white or black. There are four pins on the QRE1113 - two control the IR emitting LED while the other two are the collector and emitter of a phototransistor. The IR diode has a max forward current of 50mA and operates at 940nm. Breakout boards with analog and digital outputs are also available. Features: Phototransistor output No contact surface...

LED Display Driver (8-Digit) - MAX7219CNG
Price: $11.22
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Sparkfun Item #: COM-09622 -

"The MAX7219CNG is a compact, serial input/output common-cathode display driver that can interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Communication with the MAX7219 is achieved through a convenient 4-wire serial interface (supports SPI). Individual digits may be addressed and...

MP3 and MIDI Codec - VS1053B
Price: $32.20
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Sparkfun Item #: COM-08892 -

"VS1053b from VLSI is a single-chip Ogg Vorbis/MP3/AAC/WMA/MIDI audio decoder and an IMA ADPCM and user-loadable Ogg Vorbis encoder. It contains a high-performance, proprietary low-power DSP processor core VS DSP4, working data memory, 16 KiB instruction RAMand 0.5+ KiB data RAM for user applications running simultaneously with any built-in decoder, serial control and input data interfaces, upto 8 general purpose I/O pins, an UART, as well as a high-quality variable-sample rate stereo ADC...

MP3 and MIDI Codec - VS1063
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Price: $16.06
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Sparkfun Item #: COM-11025 -

"VS1063 is an easy-to-use, versatile encoder, decoder and codec for a multitude of audio formats. They can be hard to get hold of but we’ve got them! The VS1063 contains a high-performance, proprietary, low-power DSP core as well as ROM memory, 16KiB instruction RAM and up to 80 KiB data RAM for user applications running simultaneously with any built-in decoder! There’s built-in serial control and input data interfaces, up to 12 general purpose I/O pins, a UART, as well as...

MP3 Codec IC - VS1011E-S
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Price: $32.20
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Sparkfun Item #: COM-08125 -

"MP3 decoding is now even easier! This is the popular VS1011 single-chip MP3 audio decoder from VLSI is an easy to solder SOIC package! It contains a high-performance, low-power DSP processor core VS DSP4, working data memory, 5.5kBytes of program or data RAM for for user applications, serial control and input data interfaces, and a high-quality oversampling variable-sample-rate stereo DAC. VS1011 receives its input bitstream through a serial input bus. The input stream is decoded and passed...

MP3 Codec IC - VS1103B
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Price: $24.13
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Sparkfun Item #: COM-08894 -

"VS1103b is a single-chip MIDI/ADPCM/WAV audio decoder and ADPCM encoder that can handle up to three simultaneous audio streams. It can also act as a MIDI synthesizer. VS1103B contains a high-performance, proprietary low-power DSP processor core VS DSP4, working data memory, 5 KiB instruction RAM and 0.5 KiB data RAM for user applications, serial control and input data interfaces, 4 general purpose I/O pins, an UART, as well as a high-quality variable-sample-rate mono ADC and stereo DAC,...

MSP430 SMD IC
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Price: $7.99
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Sparkfun Item #: COM-11107 -

"The Texas Instruments MSP430 family of ultralow-power microcontrollers consist of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low power modes is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that attribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows...

P-Channel MOSFET 20V 24A - low Vgs(th)
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Price: $3.15
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Sparkfun Item #: COM-12901 -

"If you’ve ever wondered how to control high current devices from a low-power microcontroller, a MOSFET is what you need. The NDP6020P is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with most 5V and 3.3v microcontroller or mechanical switches. This allows you to control high-power devices with very low-power control mechanisms. Documents: Datasheet " ...

P-Channel MOSFET 60V 27A
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Price: $1.53
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Sparkfun Item #: COM-10349 -

"If you’ve ever wondered how to control the headlight of a car from a microcontroller, a MOSFET is what you need. The FQP27P06 is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with most 5V microcontroller or mechanical switches. This allows you to control high-power devices with very low-power control mechanisms. Documents: Datasheet " ...

Real Time Clock - DS3234
Price: $16.06
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Sparkfun Item #: COM-10079 -

"RTC stands for real time clock folks. The DS3234 is a low-cost, extremely accurate SPI bus RTC with an integrated temperature compensated crystal oscillator (TCXO) and crystal. And yes, a breakout board is coming soon. Features: Battery Backup Input for Continuous Timekeeping High-precision (±2ppm) Operating Temperature Range 0°C to +70°C Low-Power Consumption Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to...

Resonator 20MHz SMD (Strip of 10)
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Price: $5.04
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Sparkfun Item #: DD-14068 -

"This is a 10-pack of 20MHz resonators in a tiny SMD package. Resonators function like crystals but stick closer to their specified frequency over a full temperature range. These resonators possess an initial frequency tolerance of ±0.5% and a load capacity of 15pF. These specific resonators were once used in a multitude of our products but, sadly, are no longer needed. We have made them available at a drastically reduced price for anyone who could possibly use one (or 10) of these handy...

RS232 Converter SMD - MAX3232
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Price: $3.15
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Sparkfun Item #: COM-00589 -

"The ‘must have’ IC for 3V projects. This is the RS232 converter IC that is capable of running at 3V and communicating with 3V logic. Comes in an easy to solder 16-Pin SOIC SMD package. Requires four external 0.1uF ceramic capacitors - no more 10uF monsters! Operates from 2.7V to 6V. Documents: Datasheet (3232EB) "

Thermocouple Amplifier AD595-AQ
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Price: $29.25
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Sparkfun Item #: COM-00306 -

"Analog Devices Thermocouple Type-K Amplifier. Attach a thermocouple, 5V power, and a decoupling capacitor and you’ve got 10mV/C output! Perfect for high temperature application. The 10mV/C analog output interfaces nicely with 10-bit ADCs found on many types of microcontrollers. +/- 3C Accuracy 10mV per degree C Output Laser Trimmed 250mV Output at 25C 5V-15V Power Supply Requires only a decoupling capacitor Resources: AD595 Datasheet Easy Reflow Toaster Oven CNC Toaster Oven " ...

Transistor - NPN (2N3904)
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Price: $0.81
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Sparkfun Item #: COM-00521 -

"These are very common, high quality BJT NPN transistors made by ST Micro. Datasheet: 2N3904"

Transistor - PNP (2N3906)
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Price: $0.81
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Sparkfun Item #: COM-00522 -

"These are very common, high quality BJT, PNP transistors made by ST Micro. Datasheet: 2N3906"

Transistor Array - ULN2803 (3 Pack)
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Price: $3.15
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Sparkfun Item #: COM-13885 -

"This simple Transistor Array pack contains three SMD ULN2803 ICs from Texas Instruments. Each of these tiny ICs consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching a board’s inductive loads with a collector current of 500mA. Each ULN2803 can absolutely be connected in parallel to achieve higher current capability. The ULN2803 chips in the Transistor Array are ideal when used in applications like relay drivers, hammer...

Triple Axis Accelerometer - ADXL335
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Price: $16.06
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Sparkfun Item #: COM-09265 -

"The ADXL335 is a small, thin, low power, complete 3-axis MEMS accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum full-scale range of ±3 g. It can measure the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. The user selects the bandwidth of the accelerometer using the CX, CY, and CZ capacitors at the XOUT, YOUT, and ZOUT pins. Bandwidths can be...

Triple Axis Accelerometer - ADXL345
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Price: $16.06
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Sparkfun Item #: SEN-09045 -

"The ADXL345 is a small, thin, low power, three-axis MEMS accelerometer with high resolution (13-bit) measurement up to ±16g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface. The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution...

Triple Axis Accelerometer - LIS331HH
Price: $16.06
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Sparkfun Item #: COM-09755 -

"The LIS331HH is an ultra low-power full-scale three axis linear MEMS accelerometer. It has a digital I2C/SPI serial interface which makes it ideal for using in embedded applications. The device also features ultra low-power operational modes that allow advanced power saving and smart sleep to wake-up functions. The LIS331HH has dynamically user selectable full scales of +-6g/+-12g/+-24g and is capable of measuring accelerations with output data rates from 0.5 Hz to 1kHz. The self-test...