• 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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•FRAM allows for a lower power usage & a faster write performance• It's excellent for low-power or inconsistent-power datalogging• Data buffering where you want to stream data fast while also keeping the data when there's no power• Unlike Flash or EEPROM there's no pages to worry about• Each byte can be read/written 10, 000, 000, 000, 000 times so you don't have to worry too much about wear leveling FRAM, or Ferroelectric Ram, is similar to Dynamic random-access memory, only with a ferroelectric layer instead of a dielectric layer. This gives it stable handling (the bytes you write are non-volatile) with dynamic responsiveness (you can write them very fast!) With this I2C FRAM breakout board you can add some FRAM storage to your next DIY project. This particular FRAM chip has 256 Kbits (32 KBytes) of storage, interfaces using I2C, & can run at up to 1 M Hz I2C rates. Each byte can be read & written instantaneously (like SRAM) but will keep the memory for 95 years at room temperature. Adafruit chose the largest chip that has I2C & is also 5V compliant. You can use this chip with either 3V or 5V power & logic. It comes in a breadboard-friendly breakout & a spare stick of 0.1"" male header for soldering on. Anything else you need, check out the datasheet ...

• 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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• 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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• 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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• Comes assembled & tested with a free bonus JST cable!•5V input via PCB-style USB (Universal Serial Bus) connector• For charging single Lithium Ion/ Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)•100m A charge current, adjustable to 500m A by soldering a jumper closed• Free 2-pin JST cable included!• For more details please click here for the datasheet Oh so adorable, this is the tiniest little lipo charger, so handy you can keep it any project box! Its also easy to use. Simply plug in the gold plated contacts into any USB (Universal Serial Bus) port & a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. There are two LEDs
- one red & one green. While charging, the red LED is lit. When the battery is fully charged & ready for use, the green LED turns on. Seriously, it could not get more easy. Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge & finally a constant-voltage trickle charge to keep the battery topped-up. The charge current is 100m A by default, so it will work with any size battery & USB (Universal Serial Bus) port. If you want you can easily change it over to 500m A mode by soldering closed the jumper on the back, for when you'll only be charging batteries with 500m Ah size or larger. For use with Adafruit Li Poly/ Li Ion batteries only! Other batteries may have different voltage, chemistry, polarity or pinout.
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