USB Game-pad and Mouse With Accelerometer
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Interfacing seven segment to microcontroller
The Tutorial shows how to interface 7-segment display to a microcontroller. Also explains how do display more than one 7-segment on same data lines using scanning method. 7 Seg displays are are basically 7 LED's. It will be much easier...
mosfet Turning a microcontroller on with a flip flop
The objective is to control the power to a load, specifically an 8051-based microcontroller (uC), using two switches. When the uC is powered on, it sets the PWR pin high. Upon pressing the switches again, pin 4 of the flip-flop...
Secure USB Time-Stamp for Data-Logging
This project implements a USB device that provides a real-time clock for time-stamping events in a non-networked embedded computer environment. For embedded applications requiring periodic time-stamping (such as entry-system logs and configuration audit logs), an accurate real-time clock is necessary,...
lf286 Linux USB LCD display with watchdog and buttons
This article is the result of positive feedback on previous hardware articles. Readers of LinuxFocus expressed interest in interfacing with the USB bus. This solution utilizes the LCD display from a May 2002 article and connects it to the USB...
usb pow
The USB standard limits the current consumption of all USB devices to either 100mA or 500mA, depending on the specifications of the USB hub or host controller (e.g., a computer) supplying the power. Ideally, no USB device should draw more...
Microcontroller-based: Electric fan switching relay or triac
A project is underway to control the speed of an electric fan (220Vac, 60W, 5A max.) automatically using a microcontroller based on certain parameters.
The circuit design for controlling the speed of an electric fan involves several key components to ensure...
DIAL ALARM-1
This is the lowest cost dialing alarm on the market and shows what can be done with an 8-pin microcontroller. The complete circuit is shown below. You cannot see all the features of this project by looking at the circuit...
Controlling high-current circuits
Digital output from a microcontroller is typically a low-amperage signal. For example, when a pin is set HIGH on the microcontroller (in Wiring/Arduino, it is digitalWrite(somePin, HIGH);), the voltage from that pin is usually +3.3V or +5V, with the current...
Driving circuit schematic
The driving circuit depicted in Figure 18-12 consists of a connection between the driving portion, the microcontroller, and the air conditioning operation components of the bridge. The microcontroller's digital signal levels from ports P4.0 to P4.3 (approximately 12 feet) and...