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  • CraigDubya commented on CraigDubya's instructable Home Automation with Arduino6 months ago
    Home Automation with Arduino

    Hi,If you check the top of these relays they are printed with their current ratings, however, I decided to look at the data sheet and found that they are rated for 7 Amps at 240 Volts AC with a purely resistive load. If there is an inductance in the load (motors, transformers etc) you should probably lower this again to around 5 or 6 Amps. Most household electrical items (TV's, Blu-Ray players, lights and such will all be drawing less current than this). It may be that you have been looking at the current rating of the 5V coil within the relay which I guess could be rated at around 1A.I have used this home automation system for over a year now with such things as desk lamps, security lights, LED strip transformers, Christmas tree lights, fluorescent tube lighting, computer monitors (don...see more »Hi,If you check the top of these relays they are printed with their current ratings, however, I decided to look at the data sheet and found that they are rated for 7 Amps at 240 Volts AC with a purely resistive load. If there is an inductance in the load (motors, transformers etc) you should probably lower this again to around 5 or 6 Amps. Most household electrical items (TV's, Blu-Ray players, lights and such will all be drawing less current than this). It may be that you have been looking at the current rating of the 5V coil within the relay which I guess could be rated at around 1A.I have used this home automation system for over a year now with such things as desk lamps, security lights, LED strip transformers, Christmas tree lights, fluorescent tube lighting, computer monitors (don't use it for the main desktop as they can be quite power hungry) :)

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  • CraigDubya commented on CraigDubya's instructable Home Automation with Arduino6 months ago
    Home Automation with Arduino

    Thanks for your kind comment :)

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  • CraigDubya commented on CraigDubya's instructable MotorBike/PushBike Alarm System7 months ago
    MotorBike/PushBike Alarm System

    Oops!! You're absolutely right!I had forgotten to re-label the voltage regulators in the Proteus diagram and was using it to write this Instructable. The device used was actually a LM1117T for the 3.3V supply, I have edited the Instructable description and modified the circuit diagram to show this.I'm not sure of the legalities of shocking someone, even if they are a thief!I haven't tested the idle current draw thoroughly, however, a 9V 250mAh PP3 battery lasted approximately 5 hours which would indicate an approximate current draw of 50mA. There are ways to reduce the current consumption, a great tutorial on this can be found here.

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