Obstacle sensing walking stick for visually impaired persons

Avinash Gupta wrote an article detailing his smart walking stick project for visually impaired persons This project is designed to guide a visually impaired person to walk and avoid bumping into obstacles. Low cost ultrasonic rangefinders along with a microcontroller is used to measure the distance to obstacles and if they are close enough provide a feedback […]

DIY Internet connected smart humidifier

Martin’s DIY Internet connected smart humidifier project: The project uses a DHT22 temperature sensor mounted to the side of the enclosure for better ventilation and reliable reading: I threw in a ultra-cheap I2C OLED status display to get a visual reading. Milling the box so that the OLED shows was pretty nasty, hated it. I […]

Arduino equipped inline sensor skates

Anurag Mishra writes, Recently I bought a new pair of Inline Skates. So an idea struck my mind. I modified my skates to give me some results. I wanted to measure the speed with which I am skating and if I get to know the surrounding conditions, that would be awesome. So, I brought an […]

Flir Lepton thermal imaging sensor + gameduino 2

Andrew Rossignol of The Resistor Network writes: I have successfully implemented a driver for the Lepton module and displayed frames on an LCD. This is all running on an STM32F4 processor on a Nucleo board. Attached to it is a Gameduino 2 which incorporates the FT800 graphics processor. I have implemented my own colorization and […]

Reverse engineering a Verisure wireless alarm

Here’s an informative two-part series of posts over at FunOverIP detailing how to reverse engineer a Verisure wireless alarm. Part 1 details the beginning steps such as finding the modules radio frequency and modulation type, analyzing the chipset datasheet and using GNU Radio.

OV7670 image sensor data capture with Atxmega32E5 without using external FIFO

Kehribar has interfaced a OV7670 camera module with Xmegae5 microcontroller without external FIFO: With current configuration, this system sends 20FPS 80×60 grayscale image data over 3Mbaud serial stream. There is 3 byte preamble {0xAA,0x55,0xAA} to indicate the start of a new image frame. Computer software / other MCU can use those bytes to sync with […]

Automatic plant watering system using AVR(Atmega16) Microcontroller

Here’s an automatic watering system using AVR from Gadgetronicx: Primitive irrigation systems possess many drawbacks as it fails to conserve water and human energy. So introducing Automation in it can help us to overcome these drawbacks and pave way to conserve water. This can be done with a simple Soil moisture sensor and a Microcontroller, AVR […]

American pro football using RFID

With the start of the USA’s pro football season the NFL has announced the use of RFID technology to enhance reporting of player performance data. The NFL partnered with Zebra Technologies, which is applying the same radio-frequency identification (RFID) technology that it has used the past 15 years to monitor everything from supplies on automotive […]

Sound activated switch

A sound activated switch project by Rajkumar Sharma of Electronics Lab: Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp. 555 timer IC […]

Reverse engineering a wireless soil moisture sensor

Ray Wang at Rayshobby has been working on reverse engineering a wireless soil moisture sensor. He writes, “At the Maker Faire this year I got lots of questions about soil moisture, which I knew little about. Recently I started learning about how to build my own soil sensor, and came across this cheap 433MHz wirelss […]

Temperature and humidity measurement with DHT11

  Ondrej Karas of DoItWireless writes: This article describes temperature and humidity measurement with DHT11 sensor connected to TR module. Circuit diagram is very simple. You need only power supply for sensor and one wire for data line. This line has to be “pull-uped” – sensor has open colector output.