JY-9XX multi coin selector coin acceptor programming

 Features

   Intelligent CPU software control, and high accuracy.

  Self-programming without PC, and automatic self-test for problem

  Accept different kinds of coins at the same time. Free to set up pulses' output.

  Prevent not only electric shock but also electromagnetic interference.

  Support multi coins with only 1 signal output.

  Capable of accepting all worldwide Coins and Tokens

HC-05 Bluetooth module Set in AT command mode

HC-05 embedded Bluetooth serial communication module (can be short for module) has two work modes: order-response work mode and automatic connection work mode. And there are three work roles (Master, Slave and Loopback)

Laser/ LED Audio transmitter and Reciever

            

                      This laser/LED transmitter receiver circuit use light from a laser/led  to transmit an receive signal from a distance. This laser transmitter receiver use a laser/led beam as the carrier in the circuit  .This laser transmitter receiver circuit 

Solve USB to TTL converter Windows driver compatibility issues (Yellow Mark Error Code 10 in Device Manager)

Windows 8/8.1/10 are NOT supported in PL-2303HXA and PL-2303X EOL chip versions. If you are facing this issue when you connect your USB to TTL converter you can do the following steps to fix the issue.

Repair HC-05 Bluetooth module

Some days ago  one of my friend unknowingly connected 12V to  HC- 05 bluetooth module!! :(   no doubt as we know module has stopped working no power LED blink everything has gone and he put it in waste bin.

Convert Float in to String in C

There is a very useful function called dtostrf() which will convert Float in to String

The syntax is 

LED current limiting resistor calculation

To calculate resistor value needed for a simple led circuit use ohms law


R=Vcc−VfIf

Rubiks cube

Programming Arduino mini pro using USB to TTL converter

Here in this post i'm going to tell you how to program your arduino mini pro using a USB to TTL converter.

Requires:

1.USB to TTL converter( I used D-SUN)
2.Arduino mini pro
3.Connecting wires

Connect ESP8266 to internet(Hotspot) using AT commands

 If your hardware setup is not ready then see my post ESP8266 hardware setup

Now you are ready to send your first Command!
.
The updated firmware versions require Carriage-Return-and-New-Line line endings and
there appears to be no way to configure screen to send both with one key press. Instead, you need
to press <enter> or Ctrl-M then follow that with Ctrl-J.

1. Open your Hyper terminal

2.Configure Hyper terminal

Update the Firmware in Your ESP8266 Wi-Fi Module

 ESP8266 is low cost WiFi module suitable for adding WiFi functionality to an
existing microcontroller project via a UART serial connection. The module can even be reprogrammed to act as a standalone WiFi connected device–just add power. Here this tutorial will help you to update the firmware of your ESP8266.

Free RTOS inter task communication

Inter Task Communication

q  Queue management

q  Resources management

Interrupt and Polling

What is interrupt?

In an embedded system we use many sensors, serial communication, ADC and much more Microcontroller communicates

FreeRTOS Task

         A task is a user define function with a given priorityTask must return void and take a void pointer parameter.

void ATaskFunction( void *pvParameters );

Each task is a small program in its own right normally

What is FreeRTOS

 

FreeRTOS is a market leading RTOS from Real Time Engineers Ltd and it supports more than 35 architectures and received greater than 113000 downloads during 2014.

Display Image on GLCD

Hi, Do you want to display image on GLCD ?? Just follow these steps :)

Graphic LCD

Graphic  LCD

Character LCD                                                     

GraphicLCD

The character LCD can display only

Finding Value of Capacitors

Finding Value of Capacitors

Electrolytic capacitor

Electrolytic capacitors are polarized capacitor (+ve and –ve) and

Ternary Operator in C

In C programming we often use ternary operator (? :). The ternary operator is a conditional operator similar to the way conditional expression if-else.

Real time Operating System

Real Time Operating System

A real Time Operating System is designed for real time applications, intended to serve real time application requests such applications include embedded systems, industrial robots, scientific research equipment etc.  The operating systems appear to allow multiple programs to execute simultaneously.