Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
BJT H-bridge Circuit Details
You should notice that the opto-isolator LEDs are connected to three wires labeled "FWD", "REV", and "ENA*. " These wires deserve a bit of explanation. The FWD, REV, and ENA* lines are the interface between the bridge and the microprocessor. You will notice their is no "ground" signal. When you connect these pins to a BASIC stamp or a 68HC11 or...
BJT H-bridge Implementation
Because these transistors are a complementary pair, the circuit using them is very symmetrical. The upper right and upper left corners of the H-bridge are called "sources. " This name originates from their function which is to be a source of current for the load (in our case the motor). Referring to the schematic on the right, you can see that...
line follower robot Project
line following robot sensor
For any robot to perform the tasks it is assigned, a controller is required. The controller may be mechanical, electrical, electronic or a combination of these. It is the brain of the entire system and gives the robot its intelligence. Additional functionalities that a controller may possess will indicate a higher level of intelligence exhibited b
A robot that dances to music. G‚ Wouldn`t it be wicked cool to have a cute little robot on your desk dancing to Fatboy Slim Winamp provides a nice API for writing music visualization plug-ins. G‚ I wrote a plug-in that sends signals to the parallelport that correspond to the waveform data in the song being played. G‚ By setting the pins of the...
Fire Fighting Robot
When deciding how to move the robot through the house, the designers realized that precision movement would be necessary in order to avoid touching the walls and receiving penalties. In order to achieve the required precision in movement, it was decided that the robot would utilize stepper motors. The main benefit of stepper motors is that they...
The Follow-Me Rover robot circuit
It uses body heat to locate and track its human master. At heart of this heat seeking capability is the Devantech TPA81 Thermal Sensor Array. The TPA81 consists of an array of eight detectors mounted horizontally. Each of the detectors is capable of detecting infrared at radiant heat wavelengths. The array also provides the current ambient air...
Electronic robot wiring schematic
The wiring schematic played a big roll on the robot. This diagram is used to graphically display all the wiring of the motor controlling micro-components that gave the robot the ability to physically move forward, backward, left, right, and stop. (This diagram was designed in Circuit Maker 2000)
Small 3-wheel ROBOT with PIC16F84 brain & InfraRed eyes
When the 36 kHz infrared light from the LEDs is reflected by an object, one of the receiver modules will be triggered, and the PIC16F84 µController will steer the ROBOT away from the objects by reversing one of the motors.
Robot shield for Arduino
The idea behind this post is to bring together some robot designs and trasform them in a new device with new hardware and standard software (arduino of course) and so easier to use. These robots have three things in common: a mechanical structure, the hardware and the software. While the mechanical part is necessarily different, we wanted to under
Simple Light Seeking Robot
This robot was designed as a project for secondary school pupils to build on an activity day. The chassis was provided to the pupils pre cut. The entire cost of the components per robot was just under GBP5 including the batteries. The robot is built on a small aluminium chassis and has two motors to move the robot left or right and two light depen
Simple MCU-less Differential Motor Drive Circuit
Originally, the tank cost around Php400 but then it was sold at around a hundred less. Without thinking twice I know I had a great offer so I decided to buy the toy. Opening the toy was quite a bit tricky. The track belt needs to be removed first and the middle wheels must be pulled out to reveal the two screws joining the tank`s upper body to...
Light following robot
One of the motors always seem to hesitate and be on or off randomly. Also the motors are just very unpredictable in general (with this setup that is). When I use them independently they work fine without any hesitation or anything. Regarding your GPS unit, it does have a Low Voltage TTL serial output on the connector. I can`t find a decent...
Encoder circuit for servos
Remember that the circuit will fit tightly, so you will not have to glue it. Try several times to put it inside. Modify it bit by bit, and when it enters with a little effort but does not move you have the right size. put the whole circuit inside the servo, trying to adapt it just to let it fit while pushing out the sensors on their holes (they...
The Wooden Menace Circuit
The hardware schematic for the wooden menace (robotic arm) is fairly straight forward. The PIC microcontroller has one control line feeding to each servo and it also connects to the RJ45 connecter. The RJ45 connector is used for getting input from the controller. The power circuit is just a 9v Battery hooked up to the LM7805 with a 1uF capacitor
Robot Motor Control Schematic
The schematic for controlling the motors is split up into three main parts, with each part having a unique functionality. The main parts used and seen in the schematic below are the 18F252, SN754410 and 2N2222 Transistors. Seen at the very top, the microcontroller circuit consists of the PIC 18F252, its 40 MHz crystal, a few LEDs, the enable l
Robot Proximity Sensor Schematic
The Proximity Sensor circuit can be seen below. Three red boxes show the additions to the circuit that we already built in Part 2: Motor Control. The new parts used and seen in the schematic below are the GP2Y0A21YK IR Sensor, Headphone Speaker and some LEDs. The analog voltage (between +3. 5v to +0. 0v) is input into the PIC`s
Robotic Eyebrows Circuit
Make Programmable Line Follower Robot Based Microcontroller Atmega8535
Electronic Schematic Diagram of Light Detector Robot using Light Dependent Resistor (LDR)
To describe the performance or work of electronic schematic of Light Detector Robot as like in figure 1 above we can divide into three parts. In sensor, Microcontroller, and driver dc motor. In this part we use LDR as light detector or sensor. LDR will change the resistance when this component detect the light. With the circuit above LDR connected
Edge Avoider Robot without microcontroller
Edge Avoider Robot (EAR) is a mobile device, which senses and avoids the absence of surface below it..
Mobile Controlled Robot without microcontroller
A Mobile Controlled Robot is a mobile device, which provides wide-range of wireless control ability to your robot unless your cell phone gets out of signal..
Obstacle Avoiding Robot without microcontroller
An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just understand the circuit diagram and start doing this robot. This simple technique can be inc
Using Motor Bridges
Bridges allow your robot to control high current motors. They literally "bridge" between the low-current logic circuitry of your robot`s brain to the high current demanded from the motors. Many, but not all, use the common "H" arrangement of control circuitry (usually power transistors) to provide on/off and directional controls to the motors - h
AMP Hexadecimal Rotary Switch
Pictures and a sample schematic (including pinouts) of an AMP hexadecimal (16-position) switch with screw slot actuator..
Appetizer Solar-Powered BEAM Robot
A light-seeking solar-powered tiny robot based on a BEAM design. Article includes pictures, links, a video, and a schematic..
DIY ATtiny STK505 Programming Board Replacement
Do-it-yourself Atmel STK505 replacement board allows programming of ATtiny84 and ATtiny861 (14-pin and 20-pin) AVR microcontrollers with the STK500 development kit. Article also describes an ATtiny 8-pin quick setup connector board..
Wiring Diagram for a Back-And-Forth Robot
A schematic that details the connections to the Clare IXDI404PI chip that is both the brains and the brawn of the Back-And-Forth robot that you can make yourself..
Stepper Motor Circuits
Remote Control Circuits
Direction Finder Circuits
Power Control Circuits
Motor Control 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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