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Common Components and Their Functions

LED, tri-colour LED, IR LED, laser diode, resistor, LDR, potentiometer, capacitor, push button, tilt sensor, transistor, IR phototransistor, relay module, temperature sensor, IR receiver, piezo, speaker, servo motor, DC motor, ultrasonic transceiver, PIR motion sensor

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Get More Digital IO Pins Through Pins D0, D1, A0 to A5

USING PIN 0 and PIN 1 Pin 0 and pin 1 on the Arduino are usually used for communication between the Arduino and your computer. You can use these pins as digital input or output as long as you’ve completed troubleshooting your project because you cannot use Serial Monitor. Things to remember Do not use […]

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Sound Recording in App Inventor

OVERVIEW You can make a recording of your voice or a sound, and then you can play back your recording in App Inventor. You need two components: SoundRecorder and Player. PART 1: DESIGN THE INTERFACE PART 2: CREATE THE SCRIPTS STEP 1: Create these scripts for the Record button.   STEP 2: Create this script […]

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Using IR LED and IR Phototransistor

OVERVIEW IR LED and IR phototransistor can send and receive light in the infrared (IR) region. This light is not visible to the naked eye, but you might be able to see this light using the camera on your mobile phone. A pair of IR LED and IR phototransistor can be used as a proximity […]

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Control a Circuit with an IR Remote Control

OVERVIEW Adding an infrared (IR) receiver to a circuit lets you control the circuit with an IR remote control. PART 1: TESTING THE IR RECEIVER STEP 1: Assemble this circuit. STEP 2: Point a regular TV remote control at the IR receiver. Press any button on the TV remote control and the LED on the […]

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Making a Sound Meter with a Microphone

OVERVIEW A sound meter lets you measure how loud a sound is. PART 1: ASSEMBLE THE CIRCUIT The LM358 IC and the polarised capacitor need to be orientated correctly. See below for details. PART 2: VISUALISING DATA STEP 1: Open this file and upload it to Arduino. This sketch displays the value of A0 (microphone […]

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Soldering Technique

OVERVIEW Soldering is used today to make electrical connections. Modern electronic systems are formed from thousands of components connected by soldering. If any connection fails, the system could stop working, resulting in loss of time, money, or even lives. Therefore, good soldering technique is important to ensure reliable electrical connections. Solder melts at high temperature […]

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Non-Contact Voltage Detector

OVERVIEW A non-contact voltage detector is a useful tool to detect nearby electrical fields. It can detect the presence of AC power in cables, switches, outlets, and fixtures without touching them. It can even detect static electricity!   PART 1: ASSEMBLE THE CIRCUIT     PART 2: OPERATION OF THE CIRCUIT A transistor is normally […]

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Display Characters on an LCD

OVERVIEW An LCD display can replace your Serial Monitor as a display module. This is useful for standalone projects, where the Arduino runs on its own power supply and is not connected to a computer. PART 1: ASSEMBLE THE LCD NOTE: For proper soldering technique, see Guide: Soldering Technique.   Pin Name Function 1 Vss GND […]

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