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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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C525A AI and IoT with Arduino — A.01.03

A change in Chrome to protect users from malicious extensions requires a workaround to install the Machine Learning extension. This affects the procedure described in Part I1 Machine Learning. Perform the following procedure to install the Machine Learning extension. In the C525A Mentor Folder, unzip Machine-Learning.zip. If you can’t find this file, please download the latest […]

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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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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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Capacitive Touch Switch

OVERVIEW A capacitive touch switch is a switch that works by touch. It even works when your hand is close to it. This means you can conceal your switch under plastic, wood, or other insulating material and still trigger the switch by touch. PART 1: ASSEMBLE THE CIRCUIT     PART 2: PROGRAM THE ARDUINO […]

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Switch a High-Power Circuit with a Relay

OVERVIEW WARNING: Do not construct circuits involving mains supply without close expert supervision. You risk electrical shock which can be fatal. A relay is normally used to switch a high-power circuit such as mains power. The relay is controlled with a low-power circuit. Inside the relay is a coil that is energised by a low-power […]

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Motion Sensor with a PIR Switch

OVERVIEW A PIR (passive infrared) motion sensor is used to sense movements by people, animals, or other objects that emit IR or heat. The PIR can be used in your projects such as an alarm or an automatic light switch that requires the detection of people. PART 1: OPERATION OF THE PIR SWITCH When the […]

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Difference Between a Common Anode and Common Cathode Tri-Colour LED

OVERVIEW A tri-colour LED can be either common anode (the longer pin is positive) or common anode (the longer pin is negative). The best way to identify which tri-colour LED you have is to set up a circuit to test it.     PART 1: IDENTIFYING THE TRI-COLOUR LED Checking common cathode: Connect the tri-colour […]

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