HackerSpaceTech

I received a message on twitter asking if I knew how to test if a GSM Sim900 module was working.  I have not worked with that module hands on but did recall a great write up on it from a trusted source, John Boxall of http://tronixstuff.com. I learned ...

Debugging interrupt service routines can be very tricky.  It's not like you can print out variabes to the serial port as you might when debugging code outside the interrupt.  One way you can can get some idea of what your code is doing in the ISR is to pulse ...

3x4 Matrix keypad connected to an arduino. Displaying results of key pressed on a 7 segment led display via 74HC595 shift register which reduces the required pins of the 7seg display from 8 to 3.

Learn More about about Matrix Keyboards on Arduiino Playground

Learn More about using the 74HC595 ...

Here is a shield for Arduino that makes adding quality sound to your products easy.

It can play up to 22KHz, 12bit uncompressed audio files of any length. 

It's low cost, available as an easy-to-make kit. 

It has an onboard DAC, filter and op-amp for high quality output. 

Audio ...

TheLCD Button Shield from Sparkfun Electronics provides a 16x2 LCD screens along with a keypad consisting of 5 keys — select, up, right, down and left. With this shield you will be able to move through menus and make selections straight from one board attached to your Arduino without requiring ...

Added a second joystick to the shield and use one for forward/back motion and the other for turning.  I find this setup gives better control.

Jeff Branson, from Sparkfun, saw my project on facebook and suggested I submit it to Sparkfun to be added to their project section.  I ...

This shield provides the necessary connections between the joystick and the Arduino so that it can read the joysticks X, Y and Switch readings on it's analog inputs.  I chose to mount the joystick on it's own proto shield instead of mounting it to the prototype area of ...

Video explaining what multiplexing is, why we do it and how it is done.  Covers using the Arduino to handle the multiplexing and using a 7219.  Using the 7219 we can control up to 8 seven segment displays while using only 3 pins from the Arduino.  The 7219 also handles ...

Made use of The Forge makerspace at North Branch library to construct my first Arduino Shield. This shield adds 7 Status LEDs, an Infra Red LED, an Infra Red Receiver and a piezo buzzer.

Signal processing is handled by a great Arduino library written by Ken Shirriff and allows you ...

Expanding on my experiment with the MAX7219 controlling an 8x8 LED Matrix I added a second one. Both of the 8x8 displays and controllers were part of kits that couldn't fit neatly side by side, but the concept can still be demonstrated.

Using the circuit layout of the MAX7219 ...