BMP180 based USB atmospheric pressure monitor

Dilshan Jayakody published a new build: We initially developed this USB atmospheric pressure monitor to study some operating characteristics of Bosch BMP180 sensor. BMP180 is low cost sensor to measuring barometric pressure and temperature. According to the data sheet this sensor can use to measure pressure ranging between 300hPa to 1100hPa. This sensor is introduced […]

Arduino Tutorial: Adding sensors to your data logger

Edward Mallon writes: This post isn’t another How-To tutorial for a specific sensor because the Arduino community has already produced a considerable number of resources like that.  You’d be hard pressed to find any sensor in the DIY market that doesn’t give you a dozen cookbook recipes to follow after a simple Google search. In […]

How to configure I2C sensors with Arduino

Edward Mallon writes: I’ve spent the last year in the ‘uncanny valley’ of the Arduino. That’s the point where you understand the tutorials at Arduino.cc, but still don’t get much from the material on gitHub because trained programmers would never stoop to using the wire.h library when they could just roll their own in native […]

Build an open source laser reflection barrier

Boris Landoni from Open Electronics writes about an open source project laser reflection barrier: It allows us to detect the presence and passage of an object thanks to the combination of a laser diode which emits a light ray and a phototransistor which detects reflected light. Robotics applications and industrial control systems normally make use of optical […]

Adding a DHT22 temperature and humidity sensor to the Sonoff

Mikey writes: Just a few days ago I replaced the firmware on my Sonoff, and immediately after, I wanted more… After looking on their website, I found a version which also had a DHT11 sensor attached, and I then wanted to do something similar, just with a DHT22 for higher resolution (0.1C on a DHT22, […]

ZFM-20 fingerprint capture library

Dilshan Jayakody  writes: This ZFM-20 fingerprint library is developed to capture and retrieve fingerprint images from the above sensor module. The main purpose of this library is to use ZFM-20 sensor with PC as low cost fingerprint capture unit and because of that, in-module fingerprint processing and verification functions are not implemented in this library. […]

Simple pendulum tiltmeter

Jbeale shared his tiltmeter project in the forum: Apparently the most popular sensor for this purpose is an “electrolytic tilt sensor”, basically a bubble level with internal electrodes. These are not exactly consumer items. I tried building a simple pendulum tiltmeter using a split-photodiode, Optek OPR2100 (about $10 from Mouser) and LF411 opamp. The pendulum […]

Are my documents safe in the root cellar at ~80% humidity?

luckyresistor has been working on his Data Logger project: There is a large cellar where I could store unused items and documents, but the catch is the humidity there. It is a root cellar near a small brook and the humidity varies between 75% up to 90%. Archived material should never be exposed to humidity […]

DirtyPCBs: HDC1000 temperature and humidity sensor breakout, with Arduino library

Francesco Truzzi published a new build: a breakout board for the TI HDC1000, a tiny (8BGA) temperature and humidity sensor The boards were again fulfilled by DirtyPCBs, perfect for this kind of small projects. So here are the pictures of my board and here are the features: Address selection jumpers: ADR0 and ADR1 are tied to […]

App note: Infrared gesture sensing

An application note from Silicon Labs on Infrared gesture sensing (PDF!): Touchless user interfaces are an emerging trend in embedded electronics as product designers seek out innovative control methods and more intuitive ways for users to interact with electronics. Active infrared proximity motion sensing can solve this challenge. Silicon Labs Si114x proximity and ambient light sensor products […]

A Xively logger library for Spark Core

Davide Gironi writes: Xively (formerly Cosm and before that Pachube) is an on-line database service allowing developers to connect sensor-derived data (e.g. energy and environment data from objects, devices & buildings) to the Web and to build their own applications based on that data. This library is a modular and configurable Xively data logger, built […]

Classic NES played using a Kinect

Control your classic NES console with the Kinect V2 sensor by Paul DeCarlo: Ingredients: An NES console with game to test An NES controller OR some wiring skills and a CD4021BE 8-bit shift register 12 strands of wire, recommend Kynar 8 1k resistors (technically any value from 1k to 50k should suffice) 2 3.6k resistors (again […]

Measure brightness in Lux using BH1750 sensor on Spark core

Davide Gironi writes: A Spark.io library for the BH1750FVI IC. The BH1750 IC is a light intensity sensor module with built-in a 16 bit AD converter generating digital signal. With the BH1750 Light Sensor intensity can be directly measured by the luxmeter, without needing to make calculations. This library provides function to measure lux through […]

Thermostat remote temperature sensor hack

Alan Parekh of Hacked Gadgets writes: We all have thermostats in our houses but how often are they in a horrible place? You often want to place the temperature sensor in a different location than the control and display unit. There are lots of models that have remote sensor capability but they come with a […]

Hard disk drive clock with Arduino Uno

ACVoltage  wrote this instructable detailing his DIY POV clock using hard disk drive and Arduino Uno: This is a fun project that can be done easily and also cheaply. In this instructable we will explain step by step how to make this beautiful POV clock. Used material: -Arduino Uno, -Tiny RTC modul, -ULN 2003, -IR diode and IR transistor […]