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Voltage to Pressure QA - please help


videovox

Question

Hello everybody. I am a begginer in LUA programming. I tried to make a QA which reads a voltage value from a Fibaro implant (which measures the voltage on a pressure sensor), use a formula which calculates the pressure from the voltage, displays it on the same QA device and make it available to other devices for use.. The voltage is read, the pressure is correctly calculated, but it is not displayed on the QA device. It stays always zero...

This is the QA I've done, please help:

 

-- Fibaro HC3 Quick App to simulate a device based on voltage sensor 
 
-- Device ID of the voltage sensor
local voltageSensorId = 934
 
-- Device ID for the simulated pressure device
local simulatedPressureDeviceId = 918
 
-- Function to calculate pressure based on voltage
function calculatePressure(voltage)
    return 1.75*voltage - 1.87
end
 
-- Function to update the simulated pressure device
function updateSimulatedPressureDevice(voltage)
    local pressure = calculatePressure(voltage)
    hub.debug("Voltage: " .. voltage .. "V, Simulated Pressure: " .. pressure .. "atm")
    hub.call(simulatedPressureDeviceId, "setProperty""ui.label.value", pressure .. "atm")
end
 
-- Main loop to continuously read voltage and update the simulated device
while true do
    local voltage = hub.getValue(voltageSensorId, "value")
    updateSimulatedPressureDevice(voltage)
     
    hub.sleep(10000-- Sleep for 10 seconds
end
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@videovox

 

Your signature shows that you have an HC2 but you are talking about the Quick App for HC3. Please change your signature status to avoid incorrect answers to your questions.

 

Regarding your question about converting voltage to pressure, you do that in the configuration of your SmartImplant.
Then you don't need to do your own calculation and the device will be displayed correctly.
See my example where I convert voltage to cm on a level gauge.

 

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  • Inquirer
  • Thanks a lot @RH_Dreambox for your answer. I updated my profile with HC3. I forgot to change it when I upgraded my system.

    I did not know the trick with setting limits for implant, it is a very useful setting that works well.

    3 hours ago, RH_Dreambox said:

    @videovox

     

    Your signature shows that you have an HC2 but you are talking about the Quick App for HC3. Please change your signature status to avoid incorrect answers to your questions.

     

    Regarding your question about converting voltage to pressure, you do that in the configuration of your SmartImplant.
    Then you don't need to do your own calculation and the device will be displayed correctly.
    See my example where I convert voltage to cm on a level gauge.

     

    Please login or register to see this link.

     

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