schematic • Page 19 of 19 • Tech Projects

AT89C51 KEYPAD CONTROLLED SCROLLING LED DOT MATRIX TEXT USING ATMEGA

Leave a Comment / LED Projects / By Tech Master

AT89C51 Scrolling LED Circuit Operation: Keypad’t the values entered the program through is continually monitored, “*” key is pressed unless the display of the first letter that section required all letters appear, but the… Electronics Projects, AT89C51 Keypad Controlled Scrolling LED Dot Matrix Text “8051 example, avr project, keil example, microcontroller projects, “ AT89C51 Scrolling LED Circuit Operation: Keypad’t …

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How to Read Your First Autodesk EAGLE Schematic

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How to Read Your First Autodesk EAGLE Schematic Like a Pro in 3 Easy Steps The schematic forms the building block of every electrical circuit, and even if you aren’t designing one yourself, knowing how to read one is invaluable. And with some schematic reading knowledge in hand, you’ll be able to design, build and …

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Microcontroller Based Smart Battery Charger Using Atmega

Leave a Comment / Using Atmega / By Tech Master

The circuit what you are about to see is a smart battery charger based on ATMEGA8A with auto cut off.Different parameters are shown via a LCD during different charge states.Also the circuit will make sound via a buzzer upon charge completion. I built the …

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400VA AC Light Dimmer

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This is a simple TRIAC AC load dimmer used to control the power of a resistive load such as incandescent lamp or heater element. The max load it can handle is 400VA. Such a circuit is often found on cheap commercial light dimmers and is proven to work reliable for the rated power. The circuit …

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Synchronous Step-Down Switching Regulator

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Description The LT3690 is an adjustable frequency monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 90mΩ switch is included on the device along with the boost diode and the necessary oscillator, control, and logic circuitry. The internal synchronous power switch of 30mΩ increases efficiency and eliminates the need for …

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GTP USB PIC PROGRAMMER

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This work includes, GTP USB (not plus or lite) . The schematic, photos and PCB have been developed by PICMASTERS based on some valuable works done before. This programmer supports pic10F, 12F, 16C, 16F, 18F,24Cxx Eeprom. Unfortunately, it works with only Winpic800 v.355. We have successfully tried it with some pics; PIC18F252, 18F2455, 18F2550, 18F2520, …

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How to interface 8 LCD displays and 24 leds with only two wires

Leave a Comment / Blog, Tech News Updates / By TechExpert

A couple of weeks ago, I just post a review of my MCP23017 breakout board. As the board configuration allows to connect up to 8 of these boards, I decided to do it and see that it really works. My goal is interface 8 LCD displays with two wires: SDA and SCL from an I2C bus. …

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Allegro A4988 and Arduino (3)

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In the last part of my tutorial about the A4988 driver, I’m going to explain how to build a controller to adjust speed and rotation direction of a stepper motor. Schematics I used the same setup introduced in a previous post: an Arduino Uno; a LCD Keypad shield; a Pololu A4988 driver mounted on a breadboard; a NEMA17 stepper …

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Minimalist AVR programmer

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I always like a challenge, so when I saw [simpleavr]s vusbtiny programmer, I started to wonder how small I could make an AVR programmer. All in all I’m pretty pleased with the result. The schematic is almost the same as the original one. I only added a LED an resistor to indicate a proper power …

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