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Maxim > Design Support > Technical Documents > Reference Designs > 1-Wire® Devices > APP 3297
Maxim > Design Support > Technical Documents > Reference Designs > A/D and D/A Conversion/Sampling Circuits > APP 3297
Maxim > Design Support > Technical Documents > Reference Designs > Temperature Sensors and Thermal Management > APP 3297
Keywords: sms, remote monitor, remote monitoring, remote e-mail, standalone, stand-alone, stand alone,
remote temperature, brightness, gsm, network, telemetry
REFERENCE DESIGN 3297 INCLUDES: Tested Circuit Schematic Description Software
Remote Monitoring System Sends Email via SMS
Aug 09, 2004
Abstract: This application note demonstrates how to make a simple system that monitors temperature and
analog voltages remotely. On meeting certain alarm conditions, the system can send SMS messages, which
are then converted to email and forwarded to the designated email address.
A similar version of this article appeared in the August 2004 issue of EPD's (UK).
This article has also appeared in the August 2004 issues of Selezione's (Italy) and Electronics Update's (Japan).
System components:
1. PIC® microcontroller (PIC 16F877)
2. 1-Wire® temperature sensor (DS18S20)
3. 8-channel 12-bit, serial A/D converter (MAX127)
4. GSM modem.
5. SMS to email conversion service provided by TynTec.
Download source code for this project:
Remote_Monitor_EPD_Ver1.0.bas
Project Objective and Advantages
The project objective is to send email messages automatically when programmed thresholds are met. A user
programs alarm thresholds for temperature and analog input. When any of the alarm conditions are met, the
system will send a standard SMS message using the GSM module. The SMS message must be sent to the
mobile number designated by TynTec. The SMS message is then converted into an email message and
forwarded to the designated email address by TynTec's 2 Way SMS messaging service. Figure 1 outlines the
project concept.
There are several advantages to this system setup.
This is an easy way to send email that is automatically generated without human intervention.
It is simple way to monitor temperature and voltages remotely.
The system can send both email and SMS messages.
NO PC intervention is required to achieve the above operations.
The system avoids complex TCP/IP connectivity issues, which can be particularly problematic in areas
where GPRS coverage is not present.
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