Projects

Adafruit – ChronoDot – Ultra-precise Real Time Clock – v2.1

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Adafruit 255 Mk01

Adafruit 255 Mk02

Adafruit 255 Mk03

Adafruit 255 Mk04

Adafruit: 255

Description

The ChronoDot RTC is an extremely accurate real time clock module, based on the DS3231 temperature compensated RTC (TCXO). It includes a CR1632 battery (not shown, but included in the product) which should last at least 8 years if the I2C interface is only used while the device has 5V power available. No external crystal or tuning capacitors are required.

The top side of the Chronodot now features a battery holder for 16mm 3V lithium coin cells. It should work fine for CR1620 – CR1632 batteries.

The DS3231 has an internal crystal and a switched bank of tuning capacitors. The temperature of the crystal is continously monitored, and the capacitors are adjusted to maintain a stable frequency. Other RTC solutions may drift minutes per month, especially in extreme temperature ranges…the ChronoDot will drift less than a minute per year. This makes the ChronoDot very well suited for time critical applications that cannot be regularly synchronized to an external clock.

The ChronoDot will plug into a standard solderless breadboard and also has mounting holes for chassis installation.

The I2C interface is very straightforward and virtually identical to the register addresses of the popular DS1337 and DS1307 RTCs, which means that existing code for the Arduino, Basic Stamp, Cubloc, and other controllers should work with no modification.

Technical Details

Dimensions (without battery):

  • Length: 30.4mm/1.2in diameter
  • Height: 14.1mm/0.55in
  • Weight: 4 g
  • This board/chip uses I2C 7-bit address 0x68

Don Luc

Adafruit – Panel Mount 100K potentiometer (Breadboard Friendly) – 100KB

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Adafruit 1831 Mk01

Adafruit 1831 Mk02

Adafruit 1831 Mk03

Adafruit: 1831

Description

This potentiometer is a two-in-one, good in a breadboard or with a panel. Its a fairly standard linear taper 100K ohm potentiometer, with a grippy shaft. Its smooth and easy to turn, but not so loose that it will shift on its own. We like this one because the legs are 0.2″ apart with pin-points, so you can plug it into a breadboard or perfboard. Once you’re done prototyping, you can drill a hole into your project box and mount the potentiometer that way.

Technical Details

Dimensions:

  • Body: 16mm / 0.6″
  • Body Circumference: 50mm / 2″
  • Shaft Length: 15mm / 0.6″
  • Weight: 6g
  • 100K ohm potentiometer, linear taper
  • 100,000 Cycle Life
  • Rotational Travel: 300 °
  • Static Stop Strength: 90 oz-in
  • Rotational Torque: 0.5 to 1.25 oz-in

Don Luc

Adafruit – Panel Mount 1K potentiometer (Breadboard Friendly) – 1K Linear

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Adafruit 1789 Mk01

Adafruit 1789 Mk02

Adafruit 1789 Mk03

Adafruit: 1789

Description

This 1K potentiometer is a two-in-one, good in a breadboard or with a panel. Its a fairly standard linear taper 1K ohm potentiometer, with a grippy shaft. Its smooth and easy to turn, but not so loose that it will shift on its own. We like this one because the legs are 0.2″ apart with pin-points, so you can plug it into a breadboard or perfboard. Once you’re done prototyping, you can drill a hole into your project box and mount the potentiometer that way.

Technical Details

  • 1K ohm potentiometer, linear taper
  • 100,000 Cycle Life
  • Power: 0.2W
  • Rotational travel: 300 °
  • Static Stop Strength: 90 oz-in
  • Rotational Torque: 0.5 to 1.25 oz-in

Don Luc

SparkFun – Voltage Regulator – 3.3V

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SparkFun COM-00526 Mk01

SparkFun COM-00526 Mk02

SparkFun COM-00526 Mk03

SparkFun COM-00526 Mk04

SparkFun: COM-00526

Description: This is the basic LD33V voltage regulator, a low drop positive regulator with a 3.3V fixed output voltage. This fixed regulator provides a great amount of stability and protection for your project and with its on ship trimming this regulator is able to reach an output voltage tolerance within ±1%. Each one of these voltage regulators can output a max current of 800mA.

Features:

  • Output Voltage: 3.3V
  • Output Current: 800mA
  • Dropout Voltage: 1V
  • Internal Current and Thermal Limit

Don Luc

SparkFun – Voltage Regulator – 5V

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SparkFun COM-00107 Mk01

SparkFun COM-00107 Mk02

SparkFun COM-00107 Mk03

SparkFun: COM-00107

Description: 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

Don Luc

SparkFun – Voltage Regulator – Adjustable

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SparkFun COM-00527 Mk01

SparkFun COM-00527 Mk02

SparkFun: COM-00527

Description: 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 Adjustable
  • Output Current: 1.5A
  • Thermal Overload Protection
  • Short Circuit Protection
  • Output Transistor Safe
  • Floating Operation for High Voltage Applications

Don Luc

SparkFun – Electrolytic Decoupling Capacitors – 100uF/25V

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SparkFun COM-00096 Mk01

SparkFun COM-00096 Mk02

SparkFun COM-00096 Mk03

SparkFun: COM-00096

Description: Electrolytic decoupling capacitors 100uF/25V. These capacitors are great transient/surge suppressors. Attach one between the power and ground of your project to ensure smooth power delivery. High quality radial electrolytic capacitors.

Don Luc

SparkFun – Electrolytic Decoupling Capacitors – 10uF/25V

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SparkFun COM-00523 Mk01

SparkFun COM-00523 Mk02

SparkFun COM-00523 Mk03

SparkFun: COM-00523

Description: Low-profile electrolytic decoupling capacitors 10uF/25V. These capacitors are great transient/surge suppressors and work well as charge pump caps for MAX232 circuits. High quality radial electrolytic capacitors.

Don Luc