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Remote control of a relay switch

Gregory Papas
Prodigy 20 points
Other Parts Discussed in Thread: MSP430FR6989, MSP430FR5994, MSP430FR5969, MSP-EXP430FR6989

Hi all 

I need some help and advise please. To start it should be noted that I am in no way familiar with anything technical so please speak to me in lamens terms. All I have is an idea of what I want to achieve but have no idea how it would work or if its feasible from a business point of view. 

Here in Cyprus during the winter we need to switch on our hot water boilers and wait 30 min - 1hr to have hot water before we can shower. The installation for the water boilers is simple. The water boiler is connected to the main Distribution board and then the power from the DB goes to the relay switch on the wall inside the house which you need to switch on and off like a light switch. the power we use here is 240V

I would like to be able to control this remotely via an app. The IT guys I have here have pointed me in the direction of the MSP430 Launchpad and say they can develop the software to control the device if needed. 

Would this be the correct product for me to use?

If so how would the install work? 

Thank you for your help 

  • 0
    TI__Guru 56685 points

    Hello Gregory,

    What you are describing a need for is a PID controller application. I would recommend either the MSP430FR5969 , MSP430FR5994, or MSP430FR6989 (if LCD is needed) Launchpads for evaluation. The Launchpads are great evaluation tools to get you started with rapid prototyping of your application. Once you have a demo or feasibility of your application, then you can scale to the appropriate device not featured on a launchpad and build a custom board for further development. For the above, all of these chips are similar, but offer different features. the MSP430FR6989 has an LCD module if that's needed. The MSP430FR5994 has LEA (Low Energy Accelerator) that is great for intensive algorithms which could be useful in this situation. All of the features of the MSP430FR5969 are covered in the previous two but this part doesn't include LEA or an LCD.

    In regards tot eh PID application, not sure of all that you would need, but you will need some kind of power conditioning to get that line power voltage down to 3V for the MSP430. And you will need some kind of relay switch that can be controlled by the MSP430 via 3V GPIO or PWM or some kind of other interface.

    http://www.ti.com/tool/msp-exp430fr6989

  • 0 in reply to Jace H
    Prodigy 20 points
    Hi JH

    Thanks for the reply. We are currently looking into what you have said and I will come back to you if needed.

    Thanks again you have been a big help

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