Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
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Human Sensing Circuits
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AC to DC & DC to DC
Solar Cell Circuits
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Switching Power Supplies
Light Laser LED
Digital to Analog
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Data Bus Circuits
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RF Converter Circuits
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Video Wall circuits
TV Video Circuits
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8051 / 8052
PCB CAD Software
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Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
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4 Band Resistor
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avr microcontroller circuit
Arduino Uno has a ATMEGA328P-PU microcontroller, and bunch of other stuff on the board. I`d like to program the chip without the Arduino software, and only the minimum of other components. I want to eventually create things without the cost of Arduino, and I want to learn about the other parts on the board and add them back as as needed. I`m...
Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller
A device which provides a USB port. If I attach it to a Windows PC it is recognized as a "CP2103 USB to UART Bridge Controller". According to the device documentation, it should communicate in serial format at 38400bps. Since the USB pinout is different from the serial UART of the uC, firstly I thought I would need a circuit to convert...
microcontroller driving a relay with transistor and Opto-isolator
Controlling a relay with stm32 micro controller. For the isolation I have used a 4N33 opto-isolator. As my relay coil needs around 250 mA, I used a mps222 transistor. I figured that the logic gets inverted when I used the gpio as the source voltage for the opto-isolator led. I just used a pull up instead and connected the other end of the led...
microcontroller Arduino 230v Light bulb dimming
Did you check if you actually see the zero crossings on your input pin You might want to write a sketch that toggles the pin13 LED every 50 or 60 or zerocrossings. You should see a visible 1Hz blink. jippie Mar 3 `13 at 11:41 Which input pin did you use for attaching the zero crossing detector Notice that interrupt number may not be the same as...
What transistor to use when building a simple MCU controlled LED blinking circuit
This is my conceptual schema to use a PIC12 to control the blinking of 3 LEDs with different blinking patterns. I have a few questions that would like to ask.
Protecting Microcontroller Input Pins from Soft Power Switch
Soft power switch for a microcontroller where a momentary switch can turn the circuit on (including microcontroller), and then when the switch is pushed a second time, the microcontroller can shut itself off after performing some clean up. I have the above circuit so far, but I`m not sure if it`ll be reliable. I`m using a lithium-
microcontroller Selectable Voltage Divider Optimal Switching Point
microcontroller Digital bargraph display driver circuit
For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver IC LM3914 uses analog input where as MCU produces a digital output. How can I display a value on bargraph using digital input instead of analog The bargra
mosfet Driving LED strip from microcontroller
A strip of LEDs from a microcontroller using PWM to control the brightness. The strip I have takes about 1. 5A at 12V. I`m only familiar with purely low power digital electronics so wanted to check if these assumptions are correct and get any advice :- However looking at the spec of the various MOSFETs I can buy it looks like any that can pass...
microcontroller PIR sensor triggered by itself when using timer works without timer
A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. I have a PIR sensor connected to an ATMega328p. The PIR sensor has three pins; VCC, GND and AL. The AL pin uses open collector to show that motion is detected. What I have done is th
microcontroller Can I cut off the 5v output of the IOIO to the Android
Project using Sparkfun`s IOIO for Android ( ) where power consumption is a concern. The IOIO board provides the phone with 500 mA charging if I`m correct, which is too much for continuous operation. There`s a trick I have in mind where I want to power the phone and the IOIO board separately from the same external power source (Of
microcontroller Why this transistor logic as switch is not working
I opened remote of a RC car and extended wires out of backward, forward, left and right switches. So when I ground anyone of then the circuit completes andit sends signal to the car. I wanted to close the circuit using one of the I/O pins of BeagleBone Black. The output voltage on these I/O pins is about 3. 3V. I found out that I can use...
circuit Making an obstruction avoiding device without microcontroller
Make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is correct or not [let`s assume we are driving our device in a bright room with uniform lighting] Any tips or suggestions for improvement (if it is correct)...
atmel driving LEDs directly from microcontroller pins
LED will turn on when PIO goes low - acting like GND - and current will be taken from power supply not from PIO like first method. So do I must take care of maximum current of PIO although it just act like GND not like a power supply -like method 1 -. when I make PIO low dose it really connect to GND or something else Did youtry what an LED...
How to implement a soft power switch controllable by microcontroller
A circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down. And when the user presses a momentary button, the power is brought back up again. The circuit is normally powered down. When the user presses the pushbutton, the battery is fed into the -SHDN pin, enabling the...
A microcontroller (MCU) is a small computer
A microcontroller (MCU) is a small computer in a single integrated circuit consisting of a CPU is relatively simple combined with support functions such as crystal oscillators, timers, sensors, serial and analog I / O etc. Microcontroller designed for small applications. Thus, in contrast to microprocessors used in personal computers and high perf
How to display text on 16x2 LCD using AVR microcontroller (ATmega16)
This article is in continuation to the articleSingle character LCD display using AVR. The aforesaid article shows how to display a single letter onLCD. Moving forward towards learning to work with LCD, this article explains how to display a string on LCD. Displaying string is occasionally used in many applications. The connection of the LCD with t
Stepper motor control using microcontroller AT89C51 circuit
Oscilloscope Xminilab-B on the microcontroller Atmel AVR ATXMEGA32A4
Oscilloscope Xminilab-B on the microcontroller Atmel AVR ATXMEGA32A4 electro suite in rlocman The Gabotronis company produces debug board Oscilloscope Xminilab-B on the microcontroller Atmel AVR ATXMEGA32A4 electro suite. As we found in rlocman.ru, The Gabotronis company produces debug board..
Sending SMS in PDU Mode though GSM modem connected with PC Serial Port and operated with PIC Microcontroller model in Proteus VSM
Some Voltage Regulator Ciruits for Microcontroller based Projects
a regulated and noise free power supply voltage for the microcntroller and other components like amplifiers, filters and GPS etc. , otherwise a voltage surge generated in the voltage being fed to the microcontroller and other components may permanently damage your embedded system. A voltage regulator should not let the voltage being delivered to...
New Microcontroller Chip
The PIC 16F917 is backward compatible with the PIC 16F84. That means if you write a code for PIC 16F84 in assembly or C or even compiled it to HEX file, you can still use it with the PIC 16F917 without a change in code or a recompilation.
Relay Timer with ATmega8 AVR MCU
A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 development board. The program was burned to the MCU`s flash memory using eXtreme Burner - AVR Software and Hardware. The Simple Device Timer project designed using ATmega8 AVR MVU.
Door Entry Detection for MCU Based Designs
This article discuss how you can detect the entry of a person in a room and get this signal inside your MCU. This is NOT a complete project but just an idea that can be implemented in many different projects. The technique is to use use an IR transmitter and a receiver pair. One side of door will have an IR Transmitter and the other side of door w
Servo Motor Control by Using AVR ATmega32 Microcontroller
This article is for complete beginners with servo motors. It teaches you the servo motor basic theory and gives detailed steps to use them with AVR Microcontrollers like ATmega32..
Interfacing LM35 Temperature Sensor with PIC Microcontroller
In present day, variety good sensors are available to measure almost anything. In this tutorial will explore the wonderful world of sensors, starting with a very simple analog temperature sensor LM35. We will learn how to interface it with PIC MCU and display the result in common 16x2 lcd module..
Thermometer with PIC Microcontroller
We will use them to show current room temperature using a LM35 temperature sensor. Please note that this schematic is slightly different from our previous schematic on multiplexed seven segment display. The display select i/o pins were RA0, RA1, RA2, RA3 on that schematic. But in this schematic the display lines are RA1, RA2, RA3, RA4 this is...
USB program loader for AVR microcontroller
Counter 0-9 Using Arduino Microcontroller
The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using a time delay of 1000ms (1s) after each digit. I ran through an error at some point...
How to handle digital input/output(I/O) in Avr Microcontroller
How to handle digital input/output(I/O) in Avr Microcontroller? Explained using basic programs and circuit to glow an LED,generate stepper motor sequence,read push button switch and key debouncing..
Heart rate monitor using 8051 microcontroller .measures the heart rate from finger tip
Heart rate monitor using 8051 microcontroller. Measures the heart rate from the finger tip using IR diode photo transistor pair (Photoplethysmography). AT89S51 is the microcontroller used here..
How to add 32K crystal/clock source to AVR Microcontroller (ATmega8)
This article explains how to add 32K external crystal/clock source to Atmel AVR micro controller Atmega8 with circuit diagram & C program..
Arduino Projects and Circuits
PIC Microcontroller Circuits
AVR Microcontroller Circuits
Microcontroller Programmer Circuits
68HC11 Microcontroller Circuits
8051 / 8052 Microcontroller Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial
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