LEAP: Little Electronic and Arduino Projects

All about the Raspberry Pi Pico 2, with a demonstration program created with the C/C++ Pico SDK and VS Code extension.

All about the Raspberry Pi Pico, demonstrated with a simple LED sequencing programmed using the C/C++ Pico SDK and VS Code extension.

Using MicroPython on an ESP-12E (4Mib ESP8266) to capture DS18S20 temperature measurements and log continuous readings to a cloud data collection service (Ubidots).

Using MicroPython on an ESP8266 (512kb ESP01) to capture DS18S20 temperature readings and log to a cloud data collection service (Ubidots).

A full-featured soldering practice board with a range of components (0603 , 0805, SO-8, SO-16) and a 64-LED matrix that displays a microcontroller-generated pattern when soldered correctly.

A full-featured soldering practice board with a wide range of components from 0402 to 1206 and SOP-8/16.

A basic soldering practice board with 0603, 0805, 1206, SOT-23 and SOP-16 components.

Demonstrating a free-running square wave oscillator circuit using an LM393 comparator.

Testing a common infrared obstacle avoidance sensor module, and reviewing the behaviour of the LM393-based comparator circuit when used directly or with a microcontroller (Arduino).

A quick review and test of the 3DU5C metal-encapsulated silicon phototransistor, used for light detection in the visible and infrared spectrum.

Taking a close look at the CD4029 Pre-settable Binary/Decade Up/Down Counter, and testing it out with a basic counter circuit.

Testing the LM339 when used as an inverting comparator, and the effect of positive feedback (hysteresis) to prevent oscillations at the crossing point.

Testing the LM339 when used as a non-inverting comparator, and the effect of positive feedback (hysteresis) to prevent oscillations at the crossing point.

Fixing a laser pointer and torch powered by a 3V coin cell.

Investigating and testing infrared (IR) transmission between IR LEDs and IR photodiodes.

Book notes: Make: More Electronics: Journey Deep Into the World of Logic Chips, Amplifiers, Sensors, and Randomicity by Charles Platt.

Build and understand the circuit used in this common Firefly DIY kit featuring light-activated vibration movement and a pulsating LED.

Using the laser cutting services available in Singapore's National Libraries - Brother ScanNCut SDX1200.

Building an hourglass animation that demonstrates some pretty claver multiplexing with the STC15W204S (8051-compatible) microprocessor.

Testing a common CD4011 touch switch circuit with single on/off toggle pad

Testing a common CD4011 touch switch circuit with separate on and off pads.

Driving a common-cathode 7-Segment LED with the AT89C2051

A simple PWM generator circuit using the 555 timer IC designed for use on a breadboard.

A 555 timer-based square wave generator designed for use on a breadboard.

All about using 8051 interrupts with the AT89C2051.

Set-Reset latch implemented with CD4011 NAND gates

Using an 8051 timer register as a counter with the AT89C2051.

All about using 8051 timer registers with the AT89C2051

How to turn a cheap quartz clock mechanism into perhaps the most annoying cuckoo clock ever: flashing LEDs, nodding snowman, and a tick-tock chime every second.

A 555/74LS73 circuit that generates a tick-tock sound sequence at distinct frequencies.

Another two-tone doorbell circuit using a 555 timer oscillator.

A simple 555 circuit that provides a power-on delay.

An unusual configuration of the 555 produces an astable oscillation with minimal, small components.

Demonstrating the MCP601 op-amp used in a light detection circuit with the 2CU84 photodiode.

Wiring up the reset and oscillator support circuits gets a little tired each time one wants to prototype an AT89C2051(8051/MCS-51) project.

Testing some 8x Red LED common-cathode modules, making breadboarding with LEDs much more fun!

Using the laser cutting services available in Singapore's National Libraries - xTool S1.

Examining a common crystal-disciplined quartz clock movement mechanism, figuring out how to tap a 1Hz timing signal.

All about HD44780-based LCDs, commonly used with microcontrollers to provide 16x1, 16x2, or 20x4 character display output (e.g.

Demonstrates HD44780-based LCD control using the AT89C2051 (8051) microprocessor, compiled with SDCC on macOS

Solving cassidoo's Fireworks Grand Finale challenge for Arduino and simulating the result with the BoldportClub Matrix

Using the NWDZ Rev-01-10 RF Test Board with the NanoVNA.

Introducing the CD4017 decade counter with the LED Chaser demo circuit.

Build a 4-bit shift register made with CD4027 J-K flip-flops, setup for both manual control and an Arduino-driven demonstration sequence.

Using the TextFinder library to extract fields from a string with an Arduino

Using serial commands to control and query information from an Arduino.

An unusual use of the unbuffered CD4069 inverter - as a high-impedance amplifier.

About the MLA-30+ Active Loop Antenna, designed to receive MW/SW/HF from 500kHz to 30MHz.

Building the SolderSmoke Direct Conversion Radio Receiver and successfully capturing CW, voice, and SW across the 40m and 41m bands in Singapore.

Testing the unity gain buffer performance of the MCP601 2.7V to 6.0V Single Supply CMOS Op Amp.