LEAP#312 Matrix Firecracker

I was a bit dubious about the possibility of creating a decent firecracker animation on the 24x5 Matrix display. The additional PWM settings create another dimension, so the simulacrum is perhaps not so far off the mark. To light the firecracker, I want to use a real fire of course;-) As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

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LEAP#311 The Boldport Club Juice

Juice is a battery replacement kit that uses a pretty nifty set of AA, AAA, A23 and CR2032 inserts to inject the required regulated power where a battery or two would normally be required. Power can be supplied via the micro USB connector, or any other power supply that can be clipped or screwed on to the body of the Juice. All the structural parts punch out from the classy PCB like a model plane (more...)

LEAP#310 TEA5767 FM Stereo Chip

A couple of TEA5767 Low-power FM stereo radio chips landed in my lap. They arrived mounted on a small module board with all the essential supporting circuitry, so they should be ready to run without much external hardware. This project is a simple test drive under Arduino control. It simply skips through a selection of local FM stations and works amazingly well! As always, all notes, schematics and code are in the Little Electronics & (more...)

LEAP#309 Audio Connectors

Audio signals can be carried by any kind of connection, but there are some more commonly used standard connectors for audio applications. I started this project folder to collect notes on the verious connectors I use or have encountered. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image

LEAP#308 Combinational Logic 7-segment LED Driver

Ben Eater published a fantastic video/tutorial on designing a 7-segment hex decoder as an adjunct to his 8-bit breadboard computer quest. The first thought was of course “that’s an awful lot of work just to drive a 7-segment display .. lucky we don’t have to do that these days!” My next thought was naturally: “OK, now let’s build it!”. It was in fact a great excuse to dust off some combinational logic methods. As (more...)

LEAP#307 Boldport Matrix Keypad Control

So… ways to get arbitrary messages onto the Boldport Club Matrix? I happen to have a KeyboardMatrixModule that is coincidentally 5 keys high by 4 wide .. a number that neatly fits into the 24x5 display port of the Matrix. So I’ve wired it up and enabled a couple of commands to edit a message and start it scrolling. It is somewhat tedious, but it works! As always, all notes, schematics and code are in the (more...)

LEAP#303 Keyboard Matrix Module

I picked up one of these 4x4 Independent Keyboard Matrix modules to see how useful it might be for arbitrary input with a microcontroller. I examine how it is constructed, and provide some examples of how to make it work: LedControl - controlling the LEDs; KeyMatrixInput - multiplexed key input; SwitchInterrupts - interrupt-driven switch input. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image

LEAP#302 Game of Life on the Boldport Club Matrix

This is a quick and dirty implementation of Conway’s Game of Life on the Boldport Matrix, mainly to learn a bit more about using the AS1130 LED driver. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

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LEAP#301 DHT11 Sensor Basics

The DHT11 sensor is a very cheap and common sensor that provides readings of relative humidity (20-80% ±5%) and temperature (0-50°C ±2°C). For a first test, I’m using a simple DHT11 library from the arduino playground. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image

LEAP#300 The Matrix LED Test

The LRAS1130 Arduino library from @luckyresistor is an easy way to get started with the BoldportClub Matrix and an Arduino. I’m using a slightly modified version of the LedTest sketch from the library here. LED test = all passing! As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image