Using internal pull-up resistor in arduino

In this post, we will discuss how to use internal pull-up resistor in arduino uno. It's quite simple.

No need of using external pull-up resistor.

What is pull-up resistor?

First, we will find what pull-up resistor is and why it is used.

In many microcontroller, there are no internal pull-up resistor. For example: In 8051, there are four IO ports. Port0 has no internal pull-up resistor. Therefore, it requires external pull-up resistor.

In arduino, the moment we define any pin as input it will attain tri-state. Tri-state is  a state between logic low and logic high. We must remove this condition. Some microcontrollers have built-in internal pull up resistor while some has not.

Interfacing accelerometer with arduino uno

Interfacing accelerometer with arduino uno

Introduction:

In this post, we are going to interface accelerometer with arduino. Accelerometer is a sensor used for detecting motion or change in coordinates. We have three coordinates i.e X, Y and Z axis. It's a five-pin device out of which are for power supply Vcc and Ground. The output of the sensor is in analog.
This sensor required three analog pins. We can provide Vcc and ground directly from the analog pins.
So, we are using five analog pins. Three for axis and two for providing power to the module.

Components required:

1. Arduino Uno
2. ADXL335 (accelerometer)
3. USB type B cable for interfacing with computer.

Connections:

Make connections as follows:

ADXL335                                    Arduino

Vcc                                               A0

X                                                  A1

Y                                                  A2

Z                                                  A3

Gnd                                              A4

Smart street light using arduino

Introduction:

This project is about smart street light using arduino. This project consists of 3 analog IR (infrared) sensors. By default, the intensity of street light is set to 50 percent. We are using high intensity led as they have extra brightness. This project also features harnessing the solar and wind energy.

We are using a solar panel of  9 Volt, 2.5 watts and for wind mill, we are simply using a 12 volt dc motor.

Components required:

1. Atmega 8a (based on arduino ng board)
2. 8 high-intensity led
3. Relay
4. Perfboard
5. 7805
6. connecting wires
7. solar panel (9 volt, 2.5 watt)
8. Relay
9. 12 volt DC motor.

Temperature on GUI using visual studio and arduino

In this post, first we will interface LM35 with arduino uno and then  upload this data through serial communication. With the help of visual studio we can make computer gui application and though this gui application, we can do lot of stuffs like temperature logger, humidity monitoring. The

Stuff we require:

1. Arduino uno with usb cable
2. LM35
3. Jumper wires
4. Visual Studio (I had used VS 2012)

Make connections as follows:

LM35 interfacing with arduino

Simply provide, Vcc and GND to temperature sensor (LM35) and it's output should be connected to A0 of arduino. You can connect it to any channel from A0 to A5.