The HMC5883L is a 3-axis magnetometer. The most common include usage of the chip is as a digital compass to sense direction or using them to detect ferrous metals. The Honeywell HMC5883L is a surface-mount, multi-chip module designed for low-field…

Arduino Clock In this example we will create a simple clock example using a DS1307 breakout, a keypad/LCD shield and an Arduino Uno The DS1307 real-time clock is a low-power, full binary-coded decimal clock/calendar. Address and data are transferred over…

The HC-SR04 Ultrasonic Sensor uses sonar to determine distance to an object like bats or dolphins do. It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package. From 2cm to 400 cm or 1” to…

This example switches on all the LEDs on a 8×8 LED matrix, the matrix is controlled by a MAX7219   Typically you will get these in kit format or they may be assembled, here is a picture of a typical…

In the following example we will demonstrate the HC-SR501 PIR sensor, this sensor has many nice features including the ability to be driven by 5v, low cost (£2 to £3), it has a decent range (7 metres) and a fairly small size. These…

A reed switch is a small device that when the device is exposed to a magnetic field, the two materials inside the switch pull together and the switch closes. When the magnetic field is removed, the two materials then separate…

The Colour LCD Shield provides an easy method of connecting the popular Nokia 6100 LCD to your Arduino. The board comes as shown with the 128×128 mini colour LCD, as well as a backlight driver circuit (boosts to 7V), and three momentary push-buttons (tied…

The LoL Shield is a charlieplexed LED matrix for the Arduino. The LEDs are individually addressable, so you can use it to display anything in a 9×14 grid. Scroll text, play games, display images, or anything else you want to…

A common anode RGB LED is three one colour LEDs (one red, one green, and one blue) housed in a single package. A common anode RGB LED is the most popular type but you can also get common cathode types…

In this example we will show a basic example of connecting a DHT11 Temperature and Humidity Sensor to your Arduino. This is a very nice little, low cost sensor which requires only a pull up resistor to VDD. This can…

In this example we will connect a Piezo buzzer to our arduino and play some basic sounds, this uses the PWM functionality of the Arduino. Schematic Layout Code [codesyntax lang=”cpp”] void setup() { // declare pin 9 to be an…

The DS18B20 is a  temperature sensor that can be used in various simple projects.  This part uses the 1 wire (I2C) bus and you can connect multiple sensors up to your Arduino. The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius…

This was another shield that grabbed my attention, this LCD was used on some older nokia phones. You can find it on the internet  at very reasonable rates , I have purchased this as a shield for an Arduino but you can…

In this next example we will connect multiple LEDs to our Arduino and create an effect called the Knight rider effect (after the TV show) or the Larsson effect (named after the creator of the TV show Battlestar Galactica). In…