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You can use Arduino with a Proximity Sensor for detection of Ferrous Only Materials. In the following project – engineersgarage.com/contribution/speedometer-using-arduino-and-can-protocol, proximity sensor is used to detect RPM of DC motor. You can use a proximity sensor with desired range for detection of Ferrous only materials and indicate positive detection by glowing an LED. It is as simple as detecting a digital input and setting a digital output high or low to glow LED.November 27, 2018 at 8:47 am in reply to: PROGRAMABLE ENERGY METER FOR ELECTRICAL LOAD SURVEY #14927
there is a project on EG for Prepaid Energy Meter – engineersgarage.com/contribution/using-arduino-build-prepaid-energy-meters
You can check it out.
Please tell how you want your project to work. There is a similar project on EG for prepaid energy meter – engineersgarage.com/contribution/using-arduino-build-prepaid-energy-meters. If you intend to make something different from this, please clear how your project should work and where you are facing problem. In the EG's Project, user can buy a prepaid recharge of electricity, a smart device attached to regular energy meter monitors power consumption and when the recharged power is about to consume, SMS alert is sent to the user to make a recharge again.
You can use Lilypad Arduino Mainboard. It has 14 Digital I/O. Being size constraint, you can use 4 seven segment display to show time for which 8 GPIOs will be used in multiplexing. Now left with 6 GPIOs, 4 can be used to interface LEDs and two can be interfaced to switches for setting alarms. Of the two switches, one can be used to increament hours or minutes in loops and use other switch to transit to minutes from hours and then confirm alarm. On pressing the second switch only, the set alarms can be navigated otherwise the current time will be displayed on 7-segments by default. The board has 6 PWM pins of which 1 can be used to control motor.
You can go for Arduino Yun as slave device for each house. Arduino Yun has 20 digital I/O, so 10 of them can be used to control relay circuits to control 10 GPOs. Yun has 12 Analog I/O pins of which 10 can be used with ACS712 current sensors to measure power consumption at each GPO. The MODBUS communication with each Arduino board can be done via RS485 for which RS422/RS485 Shield can be used. The master device on Modbus can be a PC or Raspberry Pi 3. Both Arduino Yun and Raspberry Pi 3 are IoT enabled so they can be used to connect with internet either through Wi-Fi or Ethernet cables. Raspberry Pi 3 can be connected to a remote server via Wi-Fi or Ethernet cable to a router and also Modbus protocol can be implemented on it.