In the November 2010 issue of Nuts and Volts, we built a wireless device to alert us when the garage door was left open. Since then, I’ve had several readers suggest other uses for the ”Wireless Garage Door Transmitter”. The transmitter unit has the capability of inputting three signals on the terminals provided. The unit works such that any type of switch that connects to ground and to a terminal that is closed will cause a green light to display. When opened it will display a red light and if the alarm button is armed it will cause the alarm to sound. Here are three hacks to allow you to use the transmitter for other purposes.
How would you like to generate your own bitmaps to display on the 128x64 graphics kit that was introduced in the April 2010 issue of Nuts & Volts? Or even go the next step and produce animation with the same basic techniques? We’ll show you how easy it is to add this capability to your 16-bit Micro Experimenter using a cool tool from http://www.pavius.net.
In part 1 of this feature, we discussed how to use the MCP23S08 device to add digital I/O to the Experimenter. Now, we’ll discuss the associated software to make this work. The demo software is written in PIC24F C Compiler and is available here as a software downloadable project. The demo uses the MCP23S08 device to emulate an eight bit output port. All of the outputs are configured to drive their own individual LEDs through an external current limiting 100 ohm resistor. The microcontroller turns each LED on and off, one at a time, in sequence. In addition, the LCD on the Experimenter announces the demo.
Let’s jump right in with an overview of the software.
If you’ve been following the 16-Bit Micro Experimenter series in Nuts & Volts, you are already familiar with its solderless breadboard environment and the fully programmable 10 line I/O expansion bus that comes with the kit. The 10 lines can be assigned to be digital, analog or even connected to any of the PIC24F Microcontroller’s internal extensive peripheral set (i.e. dual UART, five CCP modules, ADC, Real time Clock Calendar, dual SPI, and dual I2C).
But, if you find this 10 line I/O capability constraining, there’s a really cool enhancement to add even more I/O to your kit…
Simple Step Motor Control
This project uses a PIC16F886 to drive a 5-wire step motor.
This project details how to build a Smart/SIM card reader/writer for experimentation and investigation of SIM & Smart cards.Once the reader design is built, the open source software can be used to read from and write to the card. Together they can be used to backup/restore stored SIM card data, recover deleted SMS’s and phone contacts, examine the last phone numbers dialed, etc.
If you are a beginning musician, it is often desirable to have a metronome to help keep cadence while playing. This circuit describes a variable rate metronome constructed with easy to find components.
A Custom 3D Printed Case for CHIPINO
Here’s an example of how to use your 3D printer to design a custom enclosure. Read More...
CubeSats — Part 2: The Basic Subassemblies.
Learn about some of the kits and basic subsystems that are now available for starting your own space program using CubeSats. Read More...
Numbats and Morays and Wi-Fi, Oh My!
Numbats and Morays and Wi-Fi, Oh My! Biologically, eels and anteaters are on the opposite ends of the animal world scale. Convert them to silicon and the combination of snouts, hair, teeth, and scales makes for a pretty good W-Fi sensor node development platform. This month's column takes the brand new Moray Wi-Fi development board and its Numbat networking module for a monitor and control spin on the Internet. Read More...
Load and Go!
Discover a way to selectively run multiple applications that wouldn’t normally fit into 32K of memory. Read More...
Reader Questions Answered Here (02.2015)
Questions about the size of satellite dishes and why there’s a lump in your power cable are answered. Read More...
January 08 - An Intro and Antennas
December 18 - Just in Time Parts vs. the Junkbox
October 28 - Save Time and Money Making CNC Halloween Decorations
October 22 - The Internet of Things
November 26 - Anwser for D Cell or Gell Cell Adapter for Nikon Cameras Use Nikon’s EP5 power supply connector. No camera modification or battery door removal is required. Now the remaining trick is…
August 23 - Anwser for Laser Power Supply Too bad I didn’t read your entry just a little more closely… I have not seen such a powerful diode…
January 28 - Anwser for Traffic Detector Robert beat me to the punch regarding the Doppler. My thought was to install both a Doppler sensor (like a…
November 07 - Tesla Coil Theory Thank’s for answering my question Bart, I was alway’s fascinated with Nikola Tesla inventions and what he did in Colorado…
August 02 - Diode Selection On Multimeter Thanks a lot! GFP.