Category Archives: Arduino Tutorials

Bluetooth Module Serial Communication AT command set

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Ref: www.linotux.ch/arduino/

HC-05 embedded Bluetooth serial communication module has two work modes: order-response work mode and automatic connection work mode . And there are three work roles (Master, Slave and Loopback) at the automatic connection work mode. When the module is at the automatic connection work mode, it will follow the default way set lastly to transmit the data automatically. When the module is at the order-response work mode, user can send the AT command to the module to set the control parameters and sent control order. The work mode of module can be switched by controlling the module PIN (PIO11) input level. Continue reading Bluetooth Module Serial Communication AT command set →

GSM Modem Interfacing With Arduino

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In this tutorial we will learn how to interface GSM Modem and send SMS. GSM Modems are easy long range interface where we need to read sensor data or control electrical equipment. We will start with selection of GSM modem, AT commands and connection of GSM Module with Arduino. A GSM modem is a specialized type of modem or phone hardware on small PCB which accepts a SIM card, and operates over a subscription to a mobile operator, just like a mobile phone. Continue reading GSM Modem Interfacing With Arduino →

GSM modem interfacing

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The GSM modem, phones provides a low cost, long range, wireless communication channel for embedded, microcontroller based applications that need connectivity rather than high data rates. Machinery such as industrial refrigerators, freezers, HVAC, monitoring and vending machines, vehicle service, warning system, security system, remote control etc. could benefit from being connected to a GSM modem.

This tutorial describes how to use an AVR to control a GSM modem using AT commands. The interface between modem and host is a textual protocol called AT-Commands. These commands enable GSM modem setup, dialing, text messaging etc. This particular application connects an AVR ATmega8 and SIM300, SIM900 module using a RS232 connection. Most GSM modems have same AT commands. Continue reading GSM modem interfacing →

MAX7219 7-segment display-Arduino

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MAX7219 Display Driver

The MAX7219/MAX7221 are compact, serial input/output common-cathode display drivers that interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each Continue reading MAX7219 7-segment display-Arduino →

LED Bar-graph Display

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Introduction

LED bar-graph displays are much popular in battery level indication, water level indicator applications. Most of the inverter units have LED bar-graph display on its front panel. As we have seen in previous application we used only one LED to indicate battery level. With reference to above application we are showing voltage level on LED bar-graph display. Continue reading LED Bar-graph Display →