Instructables user Slomi posted this useful project on how to build a wireless indoor and outdoor thermometer using an Arduino! Via Embedded Lab.
This Arduino-based wireless thermometer uses two Arduino boards to measure indoor and outdoor temperatures. The outdoor Arduino board sends out the outdoor temperature measured by DS18B20 sensor to the indoor Arduino board using inexpensive 433MHz RF transmitter and receiver modules. The indoor Arduino board then displays the indoor and outdoor temperatures on a character LCD display.
Indoor/outdoor wireless thermometer using Arduino - [Link]
This article is about a simple 3 digit voltmeter using arduino. The circuit can measure anything between 0 to 5V at an accuracy of 50mV. The circuit uses minimum number of external components and can be easily modified for different voltage ranges. The display device is a common anode multiplexed seven segment LED display module (Type No:E1-3056ASR1). Let’s have a look at the display device first.
Voltmeter using arduino - [Link]
I’ve been looking for ways to control my Service droid robot, my Service droid robot has an ATmega2560 (with Arduino bootloader) and a Raspberry Pi. My goal is to control it over wifi. But I wanted to start with some more simpler things first. I’ve recently found some python code on letsmakerobots.com that lets me sent data over I2C from a Raspberry Pi to a micro controller.
Before getting this to work you need to configure I2C on the Raspberry Pi. Adafruit has written a nice guide how to do this. I also installed the python-SMBus package: sudo apt-get install python-smbus.
Controlling an Arduino through a Rapsberry Pi webserver - [Link]
Bajdi blogged about his Arduino pro mini undershield:
I’ve designed another PCB This time it’s a simple undershield for the Arduino pro mini. I received the PCB’s from Electrodragon (12$ for 10PCB’s) last week. The PCB has a schottky diode and a 5V linear regulator, I’m using an LM2940 5V regulator. For the rest there are just 2 rows of female headers to plug the pro mini in and 3 rows of male pins on each side.
The reason I’ve had this PCB made is that pro mini’s are dirt cheap these days, you can find them on Ebay or Chinese shops for mess then 4$. That makes them the cheapest Arduino on the internet. It’s cheaper and easier to buy a pro mini and integrate it in to your own project then to design your own PCB with an ATmega328.
Arduino pro mini undershield - [Link]
ASCAS @ instructables.com writes:
Control your Arduino with voice commands using an Android smartphone! Before we make a voice activated home automation system, we must first learn the basic principles of the experiment. This guide will let you command the Arduino using your Android smartphone and a HC-05 Bluetooth module.
The designer of the app did not include a sample code. I looked for alternatives in Google’s PlayStore but none was as good as the app that I’ve found. Luckily, I was able to figure it out although it took me a while to program it. Sorry IOS users, this app isn’t available in Apple’s app store :/
Voice Activated Arduino (Bluetooth + Android) - [Link]
Digispark Pro – The tiny Arduino IDE ready, usb and mobile dev board and ecosystem – cheap enough to leave in any project! Wi-fi, BLE, and 25+ shields!
Serial over USB debugging, USB programmable, 14 i/o, SPI, I2C, UART, USB Device Emulation, Mobile Development Ready, Optional BT, BLE, Mesh, and Wi-Fi.
The super small, dirt cheap, always open source, Arduino compatible, USB (and Mobile and Wireless!) development (and production) platform, and follow-up to the original Digispark.
Easier to use, more pins, more program space, more features, more reliable – supporting the entire existing Digispark ecosystem of 25+ shields and adding Wi-Fi, Bluetooth, BLE shields and more! Ready for all your projects – including mobile hardware development! All still super affordable!
The Digispark Pro Ecosystem is the cheapest, Arduino compatible development platform for Mobile and Wireless hardware development.
Digispark Pro – tiny, Arduino ready, mobile & usb dev board! - [Link]
by Kalle Hyvönen:
I bought a small aquarium (54l) as an impulse buy and I needed some lights for it, so naturally I wanted to use LEDs. I also needed a timer for the lights. I also wanted the lights to fade in and out when they were going on or off as a cool effect.
I ordered four Cree XP-G R5 LEDs (cool white, apparently too warm of a light will cause algae growth) and a one amp (switching) constant current supply (with PWM support) from LED-tech.de. I had some Maxim DS3234 real-time clocks with a serial bus (SPI) which looked easy to implement so I decided to use one. I also had one spare Arduino board so that was going to be my microcontroller of choice. I used a laptop power supply as the power source.
LED aquarium lighting with an Arduino based PWM timer - [Link]
Raj @ embedded-lab.com writes:
A group of students at Indiana university has built an Arduino-based distance measuring tool as their class project. It is a handheld device that measures the distance between any two points using the latitude and longitude coordinates (received from GPS satellite) of the points. It provides distance output in Yards and is useful for sports applications, such as in golfing to compute the distance between where a ball is hit and where it ends up.
Distance meter using GPS and Arduino - [Link]
Here’s Oscar Liang another Arduino GPS project, he writes:
Garlow stands for GPS Arduino Rechargeable Logger OLED Watch. The device gives GPS information which is logged on SD card and shown on a OLED display. It can be carried as a watch or simply used as a GPS data logger. The whole system is based on Arduino Nano, with a Lipo power management module which enables USB battery recharge.
A small GPS Arduino watch/clock - [Link]
Heinz Pieren writes:
ArdaSol is the project name for my solar energy and Arduino based monitoring system. This description shows how the system is built and how it works. The energy production of a photovoltaic plant is monitored and also the consumption or feeding to grid of the energy. Data acquisition during a solar day and publishing on the internet is also a function of this system.
ArdaSol – Photovoltaic Energy Monitoring System - [Link]