pic 18f4550 The Serial Peripheral Interface (SPI) is a high speed, synchronous, serial communication standard. This communication protocol is basically a Master Slave implementation where the master device controls the clock based on which the slave devices operates. The master can communicates with one or more slave in the system through SPI bus. The SPI is special because it is simple and easy to implement in the hardware.
Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android « Android Gadget Hacks Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android There are few sounds that actually make me cringe whenever I hear them: silverware scraping on a plate, nails scratching on a chalkboard, and piercing high-frequency tones. While the former two terrors require some physical hardware, sending out high-frequency sounds is as easy as downloading an app. Of course, since high-frequency sounds are terrible things to hear, this app is great for classroom and office pranks, or quite possibly fending off dogs and bugs. Step 2: Deploy Your Attack on Surrounding Eardrums Sounds are separated into two sections: Start and Repeller. Under the Start section, you'll find your basic frequencies ranging from "Light" to "Very Heavy," followed by locked options for the Platinum version. Under the Repeller section, you'll see just two options: "Mosquito repeller" and "Dog repeller."
Microchip Controller Area Network (CAN) Bit Timing Calculator - MCP2510, MCP2515, & PIC18F; Legacy & ECAN Controllers MB Time: Size: 1.94 MB Microchip Controller Area Network (CAN) Bit Timing Calculator Compatible with MCP2510, MCP2515, and PIC18F with both legacy and ECAN can controllers. The first step is to tell the software your oscillator frequency and target Controller Area Network (CAN) baud rate. Then the software will determine the potential Baud Rate Prescaler (BRP) and number of time quanta (Tq) required. The next step is to adjust the various parameters of the bit timing. The calculator will check your setup versus different rules for the various timing. The setup report includes your complete setup. This tool is free as long as you agree not to distribute it to others. Download (MB Time)
Types of Skills Everyone Should Know – Video – Top 100 Important Skills 3. Split Firewood Seasoned splitters use a maul, not an ax, to prep firewood. (With its slim taper, an ax head often gets stuck in the end grain.) Don't use a chopping block—it reduces the arc of the swing, which decreases power. Instead, place the log on the ground, 5 in. closer than the length of the maul handle. Michael Lewis USBPicprog Open Source programmer Starting Electronics - Electronics for Beginners and Beyond
Building a PIC18F USB device - WFFwiki Update I have updated this article to use the Microchip C18 compiler and to be based around my latest USB framework libraries for both the PIC and Windows (2011-10-19). This should provide a smoother path from this basic tutorial to more complex projects. As always I welcome your feedback and suggestions over in my forums. Introduction I get a number of emails every month asking about creating USB devices using the PIC18F microcontroller. In this article I will show how to breadboard a simple USB generic HID device, creating the PIC18F firmware and finally creating the Windows interface for the device which will allow you to control a LED from the PC and read the state of a push-button from the device. For this article we're going to stick to a fairly basic USB device. Although this article is based around the PIC18F4550 microcontroller you can easily substitute this for the smaller and cheaper PIC18F2550 which is code compatible with the larger 4550. Hardware Firmware Device enumeration
Fake TV - Burglar Deterrent I was shopping around on Amazon the other day and came across a product that I thought was genius. It is called Fake TV and it acts as a burglar deterrent while you are away from the house. At night, the Fake TV turns on and uses a series of LEDs to project random colors that looks as though someone is inside watching TV when viewed through curtains or shades. There are some videos of it in action on YouTube and I have to say it really does look like someone is inside watching TV. This should scare off the large majority of petty thieves that are just looking for the quick opportunity. In another language Another view that shows comparison to a real TV Anyway, they wanted $25+ for these things that are nothing more than a microcontroller and some LEDs. This solution is better than the commercial product in my eyes because it is fully customizable!