The project aim design a prepaid energy meter using GSM technology which is used to recharge the card by sending a simple SMS and also this system send the low balance alerts to the user from GSM. The GSM modem provides the communication mechanism between the user and the energy meter by means of SMS messages. ESP 8266 WI-FI module is used to upload the data in to the thingspeak cloud. GSM based prepaid electricity is a unique and new concept which saves lot of time and power for electricity department. User can recharge the card by sending a predefine SMS to the GSM whenever the power is required. If the sufficient amount is recharged, then the electrical power department can send the message through GSM with unique identification number. So, the power is delivered to user. Depending upon the user usage of power, money will be decreased from card. Whenever the card balance gets low the system sends the SMS to the user mobile through GSM. Microcontroller is interfaced with GSM modem. “GSM based pre-paid energy meter” is a modern era automation system where we can save the power. Here the devices to be controlled are interfaced with a GSM modem unit, which is capable of receiving instructions in the form of short message service and performs the necessary tasks. A dedicated GSM modem with SIM card is required for each energy meter. The status of the project will display on the LCD screen. This system can switch OFF the power if the consumer doesn’t pay the bill automatically. Here relay works as a switch to on /off the load. Arduino NANO Microcontroller will monitor the energy meter readings will be upload in to the thingspeak cloud along with date and time. To achieve this task microcontroller Loaded program written in embedded C language.      

Features:

1. Provides user friendly remote supply to energy meter.
2. Supports controlling of meter.
3. Non-volatile memory-based energy-reading storing.
4. Auto connect feature.
5. Using THINGSPEAK CLOUD to upload the data into the Thingspeak.

    The major building blocks of this project are:

1. Regulated Power Supply.
2. ARDUINO NANO.
3. GSM Modem.
4. Digital Energy Meter.
5. Optocoupler.
6. ESP8266 WI-FI module.
7. Relay with driver.
8. LCD with driver.

      Software’s used:  

1. Arduino IDE Studio compiler for Embedded C programming.
2. Express SCH for Circuit design.

    Regulated Power Supply:

                 

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