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Author Archives: akash gaikar

Overview It's summer and you're sweating and your hair's all frizzy and all you really want to know is why the weatherman said this morning that today's relative humidity would max out at a perfectly reasonable 52% when it feels more like 77%. Enter the HTU21D-F Temperature + Humidity Sensor - the best way to prove the weatherman wrong! This I2C digital humidity sensor is an accurate and intelligent alternative to the much simplerHumidity and Temperature Sensor - SHT15 Breakout...
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Overview Fans of the BMP085/BMP180 will want to take a look at the new BMP183 - an SPI spin on the old familiar classic. This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The BMP183 is the next-generation of sensors from Bosch, and is the fraternal twin of the BMP180 - with a low altitude noise of 0.25m and...
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Overview https://youtu.be/DpZGDTNEA8I UFO Drones This summer light up the night sky and fly safe with your drone. In this project, we'll show you how you can upgrade the IRIS quad copper with LED NeoPixel rings and 3d printed prop guards. These parts provide extra protection to your propellers and are extremely light weight. What do I need to know? If you've soldered a battery or wired up your own drone, you'll be surprised just how easy this project is! If...
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Overview When the future is dazzlingly-bright, this ultra-high-range luminosity sensor will help you measure it. The TSL2591 luminosity sensor is an advanced digital light sensor, ideal for use in a wide range of light situations. Compared to low cost CdS cells, this sensor is more precise, allowing for exact lux calculations and can be configured for different gain/timing ranges to detect light ranges from up to 188uLux up to 88,000 Lux on the fly. The best part of this sensor...
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Overview Add lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121. This chip can handle up to 12 individual touch pads. The MPR121 has support for only I2C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I2C 2-wire bus. Using this chip is a lot easier than...
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Overview Unlike most of the other temperature sensors we have, this breakout has a really cool IR sensor from TI that can measure the temperature of an object without touching it. The TMP007 is the latest thermopile sensor from TI, and is an update of the TMP006. The internal math engine does all the temperature calculations so its easier to integrate - you can read the die and target temperatures directly over I2C. The TMP007 also has better transient management,...
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Overview Add motion, direction and orientation sensing to your Arduino project with this all-in-one 9-DOF sensor. Inside the chip are three sensors, one is a classic 3-axis accelerometer, which can tell you which direction is down towards the Earth (by measuring gravity) or how fast the board is accelerating in 3D space. The other is a 3-axis magnetometer that can sense where the strongest magnetic force is coming from, generally used to detect magnetic north. The third is a 3-axis...
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Overview You can detect motion, tilt and basic orientation with a digital accelerometer - and the MMA8451 is a great accelerometer to start with. It's low cost, but high precision with 14-bit ADC. It has a wide usage range, from +-2g up to +-8g yet is easy to use with Arduino or another microcontroller The MMA8451 is a miniature little accelerometer from Freescale, who are (by this point) masters at the accelerometer-design game. It's designed for use in phones, tablets,...
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Overview https://youtu.be/qVmKOM2Outg   GEMMA and Trinket are great when you want a tiny, low cost microcontroller to embed in your projects. One of the tradeoffs, however, is that they can’t send data back to the computer for debugging sensor values. For instance, you want to make a pair of Firewalker sneakers with Gemma instead of Flora, but there’s no easy way to calibrate your Velostat step sensor since you can’t see the numerical value of the reading. I recommend keeping a...
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Overview In this project, we are going to build an open-source version of WiFi power switches that you can buy in many stores. These switches can usually be controlled from a smartphone or tablet, and give you the ability to switch on or off any device that is connected to the switch. We are going to use Arduino, the CC3000 WiFi chip, and a powerswitch module to make an open-source version of such WiFi power switches. With the project we are...
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Overview Getting touchy performance with your screen's touch screen? Resistive touch screens are incredibly popular as overlays to TFT and LCD displays. If you want to connect one to a computer you need something to handle the analog to digital conversion. Most converters we've found are not very easy to use, and are 'fixed' - making them difficult to calibrate. The AR1100 is a nice chip that solves this problem by acting as a touch->USB converter and also comes with...
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Overview Reach out and touch someone, or something, with the MPR121 capacitive touch sensor and a Raspberry Pi or BeagleBone Black!  This breakout provides 12 capacitive touch inputs and all the logic to read them over a simple I2C communication bus.  For example you can make your own buttons, detect if someone touched a device, create a fun plush game controller, or even a wacky devices like a banana piano! With the MPR121 python library you can now easily use...
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Overview Infrared (IR) break-beam sensors are a simple way to detect motion. They work by having an emitter side that sends out a beam of human-invisible IR light, then a receiver across the way which is sensitive to that same light. When something passes between the two, and its not transparent to IR, then the 'beam is broken' and the receiver will let you know. Compared to PIR sensors, breakbeams are faster and allow better control of where you want...
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Overview It's 10PM, do you know where your Pi is? If you had this Pi HAT, you would! This new HAT from Adafruit adds our celebrated Ultimate GPS on it, so you can add precision time and location to your Pi 1 Model A+ or B+, or Pi 2 Here's the low-down on the GPS module: -165 dBm sensitivity, 10 Hz updates, 66 channels Only 20mA current draw Built in Real Time Clock (RTC) - slot in a CR1220 backup...
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Overview Most consumer electronic devices such as TV, cable box, DVD players and other devices use infrared signals for remote control. Each manufacturer has its own protocols for encoding the data so that signals intended for one device do not interfere with another. In an earlier tutorial by LadyAda she describes the inner working of reading IR signals from a remote and creating your own IR signals using an IR LED. Her tutorial gives you a behind-the-scenes peek at how IR works...
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