Close

c520d

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 […]

Read More

C520D Arduino Projects with Mobile Apps — A.01.01

INSTALLING CHROME EXTENSION 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 O3 Machine Learning. Perform the following procedure to install the Machine Learning extension. In the C520D Mentor Folder, unzip Machine-Learning.zip. If you can’t find this file, please […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More