•-165 d Bm sensitivity, 10 Hz updates, can track up to 22 satellites on 66 channels• Only 20m A current draw•RTC battery-compatible
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• Output voltage increases with light on the sensor• Logarithmic response not only gives more sensitivity in low light, its also almost impossible to ""max-out"" the sensor• Dynamic range of 3 to 55, 000 Lux• Use indoors & outdoors without needing to recalibrate! Upgrade a project that uses a photocell with the GA1A12S202 analogue light sensor. Like a Cd S photo-cell, the sensor does not require a microcontroller, the analog voltage output increases with the amount of light shining on the sensor face. This sensor has a lot of improvements that make it better for nearly any project. The biggest improvement over plain photocells is a true log-lin relationship with light levels. Most light sensors have a linear relationship with light levels, which means that they're not very sensitive to changes in darkened areas & 'max' out very easily when there's a lot of light. Sometimes you can tweak a resistor to make them better in dark or bright light but its hard to get good performance at both ends. This sensor is logarithmic over a large dynamic range of 3 to 55, 000 Lux, so it has a lot of sensitivity at low light levels but is also nearly impossible to ""max out"" so you can use it indoors or outdoors without changing code or calibration. Since the sensor is fabricated on a chip, there are also fewer manufacturing variations, so you won't have to calibrate the sensor from one board to another. Using the sensor is easy as pie: connect the Vin to 2.3-6VDC, Gnd to ground & measure the analogue output on OUT. It will range up to 3V (at extremely bright outdoor sunlight). On an Arduino, just use analog Read () with the OUT pin connected to an analogue pin. For more information including graphs, power consumption, etc check out the datasheet On this breakout there’s a 68KO resistor from OUT to ground to turn the current into a voltage. ...

• Super small, only 1.1"" / 28mm diameter & 0.28"" / 7mm thick• Easy-to-sew or solder pads for embedding in your wearable project• Low cost enough, you can use one for every weekend project•ATtiny 85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM• Internal oscillator runs at 8 M Hz• Ultra low power, draws only 9 m A while running•USB bootloader with a nice LED indicator looks just like a USBtiny ISP so you can program it with the Arduino IDE• Mini-USB jack for power and/or USB (Universal Serial Bus) uploading, you can put it in a box or tape it up & use any USB (Universal Serial Bus) cable for when you want to reprogram• We really worked hard on the bootloader process to make it rugged & foolproof•~5.25K bytes available for use (2.75K taken for the bootloader)• Power with either USB (Universal Serial Bus) or external output (such as a battery)
- it'll automatically switch over• On-board green power LED & red pin 1 LED• Reset button for entering the bootloader or restarting the program.•3 GPIO
- The 3 independent IO pins have 1 analog input & 2 PWM output as well.• Hardware I2C capability for breakout & sensor interfacing.GEMMA is a tiny wearable platform board with a lot of might in a 1"" diameter package. Powered by a Attiny 85 & programmable with an Arduino IDE over USB (Universal Serial Bus), you'll be able to realize any wearable project! The Attiny 85 is a fun processor because despite being so small, it has 8K of flash, & 5 I/O pins, including analog inputs & PWM 'analog' outputs. Adafruit have designed a USB (Universal Serial Bus) bootloader so you can plug it into any computer & reprogram it over a USB (Universal Serial Bus) port just like an Arduino (it uses 2 of the 5 I/O pins, leaving you with 3). In fact they even made some simple modifications to the Arduino IDE so that it works like a mini-Flora. Even though you can program GEMMA using the Arduino IDE, it's not a fully 100% Arduino-compatible. There are some things you trade off for such a small & low cost microcontroller!•GEMMA does not have a Serial port connection for debugging so the serial port monitor will not be able to send/receive data• Some computers' USB (Universal Serial Bus) v 3 ports don't recognize the GEMMAs bootloader. Simply use a USB (Universal Serial Bus) v 2 port or a USB (Universal Serial Bus) hub in between• We do not have full Windows 8 driver compatibility tested. At this time we only have it working with Mac, Linux or Windows 7/XPFor more information about GEMMA, check out Adafruits Learning guide please click here

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• Typical accuracy of ±2%• Operating range that's optimized from 5% to 95% RH• Operation outside this range is still possible
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•I2C-controlled• Works with both Raspberry Pi & Arduino• Great basic barometric pressure sensor at 1.5h Pa / 50m altitude resolution•500-1150 h Pa (up to 10km altitude)• Fully tested & assembled breakout board• All headers included (to solder yourself) This pressure sensor from Freescale is a great low-cost sensing solution for measuring barometric pressure. At 1.5 h Pa resolution it's great for basic barometric pressure sensing. The sensor is soldered onto a PCB with 10K pull-up resistors on the I2C pins. This chip is good for use with power & logic voltages ranging from 2.4V to 5.5V so you can use it with your 3V or 5V microcontroller. There's a basic temperature sensor inside but there's no specifications in the datasheet so we're not sure how accurate it is. Using the sensor is easy. For example, if you're using an Arduino, simply connect the VDD pin to the 5V voltage pin, GND to ground, SCL to I2C Clock (Analog 5 on an UNO) & SDA to I2C Data (Analog 4 on an UNO). Then download Adafruit's MPL115A2 Arduino library & example code for temperature, pressure & basic altitude calculation. Install the library, & load the example sketch. Immediately you'll have the temperature, pressure & altitude data printed in the serial console. The MPL3115A2 has a typical 1.5 Pascal resolution, which can resolve altitude at 0.3 meters (compare to the BMP180 which can do 0.17m). It has some upsides compared to the BMP180, such as interrupt outputs for ultra-low power usage, & its also a heck of a lot easier to read altitude with a built in altimeter calculation
- no calibration reading & calculating required. As a bonus, there's even a fairly good temperature sensor with ±1°C typical accuracy (±3°C max). This chip likes to be used with 2-3.6V power & logic voltages, so we placed it on a breakout with a 3V regulator & logic level shifting. Its easy to use with any Arduino or microcontroller that has i 2c capability. This chip looks & sounds a whole lot like the MPL115A2 but this is the precision version, which can act as an altitude-sensor as well as barometer Using the sensor is easy. For example, if you're using an Arduino, simply connect the VDD pin to the 5V voltage pin, GND to ground, SCL to I2C Clock (Analog 5 on an UNO) & SDA to I2C Data (Analog 4 on an UNO). Then download Adafruit's MPL3115A2 Arduino library & example code for temperature, pressure & basic altitude calculation. Install the library, & load the example sketch. Immediately you'll have the temperature, pressure & altitude data printed in the serial console.
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• Measure both the DC current draw & have a handy analog output that is with respect to ground• It can handle high side current measuring, up to +60VDC! •
Includes: 5-pin header to attach easily to a breadboard• Uses the INA169 chip, click here for datasheet This breakout board will solve all your current-monitoring problems. Instead of struggling with a multimeter, you can just use the handy INA169 chip on this breakout to both measure both the DC current draw & have a handy analogue output that is with respect to ground. The analogue output makes this an ideal breakout for feedback-loop control. Most current-measuring devices such as our current panel meter are only good for low side measuring. That means that unless you want to get a battery involved, you have to stick the measurement resistor between the target ground & true ground. This can cause problems with circuits since electronics tend to not like it when the ground references change & move with varying current draw. This chip is much smarter
- it can handle high side current measuring, up to +60VDC! A precision amplifier measures the voltage across the 0.1 ohm, 1% sense resistor. The resistor is rated for 2W continuous so you can measure up to +5A continuous. The output is a current that is drawn through the on-board 10K resistor so that the output voltage is 1V per Amp. So for 2A draw, the output will be 2V. You can change out the load resistor to be larger or smaller by cutting the traces next to it & soldering a thru hole resistor over. If you solder in a 20K resistor you'll get 2V per Amp, with a 5K resistor, 0.5V per Amp. We include a 5-pin header (so you can easily attach this sensor to a breadboard) as well as a 3.5mm terminal plug so you can easily attach & detach your load. Usage is simple. Power the sensor with 2.7-60V, & connect V+ to the high side of your power supply, then connect V- to your grounded load. Then use a multimeter to measure the voltage output, that's it!

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• Plugs in into any USB (Universal Serial Bus) A port & shows up as a USB (Universal Serial Bus) keyboard
- no drivers required
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• Sense twisting & turning motions• Three full axes of sensing• The chip can be set to ±250, ±500, or ±2000 degree-per-second scale for a large range of sensitivity• Supports both I2C & SPI•3.3V max device, but onboard level shifting allows a 5V interface A gyroscope is a type of sensor that can sense twisting & turning motions. Often paired with an accelerometer, you can use these to do 3D motion capture & inertial measurement (that is
- you can tell how an object is moving!) As these sensors become more popular & easier to manufacture, the prices for them have dropped to the point where you can easily afford a triple-axis gyro! Only a decade ago, this space-tech sensor would have been hundreds of dollars. This breakout board is based around the latest gyro technology, the L3GD20 from STMicro. It's the upgrade to the L3G4200 (see this app note on what to look for if upgrading an existing design to the L3GD20
- (http://www.st.com/internet/analog/product/252443.jsp) with three full axes of sensing. The chip can be set to ±250, ±500, or ±2000 degree-per-second scale for a large range of sensitivity. There's also built in high & low pass sensing to make data processing easier. The chip supports both I2C & SPI so you can interface with any microcontroller easily. Since this chip is a 3.3V max device, but many of our customers want to use it with an Arduino, Adafruit soldered it to a breakout board with level shifting circuitry so you can use the I2C or SPI interface safely using a 5V interface device. They also placed a 3.3V regulator on there so you can power it from 5V. Since we expect people will want to attach it firmly to their project, the PCB comes with four 2.1mm mounting holes. Use 2-56 imperial or M2 screws screws. Getting started is easy
- simply connect SDA to your Arduino I2C data pin (On the UNO this is A4), SCL to I2C clock (Uno: A5), GND to ground, & Vin to 3 or 5VDC. Then install & run Adafruits easy to use Arduino library, which will print out the XYZ sensor data to the serial terminal, click here for the library. Their library also supports SPI on any 4 digital I/O pins, see the example for wiring.


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• Simply connect 3 to 6VDC to the + pin & ground to the
- pin, & the LED on the board will light up• You can make the LEDs fade
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• Simply connect 3 to 6VDC to the + pin & ground to the
- pin, & the LED on the board will light up• You can make the LEDs fade
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