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Arduino project housing help

zewail97

Hello everyone.

 

I'm new to the Arduino world and I need some help.

I've created my very first simple Arduino project [have a look]

image

It's really simple

 

It's using three sensors

1- MQ-5 for humidity sensing

2- LM35 for temperature sensing

3- BMP180 for pressure sensing

 

Let me explain the basic idea behind this project, every sensor has 2 leds, a green one and a red one, the greed led will be always on whenever the values of the sensors are in the right range

and the red led turns on when it over this range.

 

Now I want to cover this device to put it in the factory considering the following

1- It will be put in 100 degrees C

2- There will be dust

 

So here is what I need

 

1- A box to put the device in with lots of fans to keep the device cool in 100 degrees.

2- A cover for the wires to protect it from melting in 100 degrees.

3- A kind of texture to cover the LM35 and BMP180 sensors to prevent dust from going through them.

4- A kind of texture to cover the MQ-5 sensor to prevent dust but allow air to pass through.

 

Can you please suggest the best materials to get the job done perfectly?

Thanks!

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  • 0

    I'm not sure the sensors you are planning to use are suitable for your application.

    The LM35 will withstand 100C temperature, but definitely the BMP180 will not, as it is rated for the max temperature is 85C, and so the MQ-5 sensor, which is only rated at operating temperature of 50C. Trying to protect them, enclosing in any form of thermal protective cover, will likely result impairing the sensor sensitivity, giving you unreliable readings.

    You might get away with using the LM35 this way, but for the other two I'm afraid you will need industrial grade sensors, like for example this absolute pressure sensor.

    Unfortunately this will push up the costs for your project quite substantially.

    One question: MQ-5 is a Gas detector sensor, how are you going to use it as humidity sensor?

    Fabio.

     

    P.S: For the dust problem, as correctly pointed out, you need to know the dust particle size to make any informed decision.

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  • 0

    I'm not sure the sensors you are planning to use are suitable for your application.

    The LM35 will withstand 100C temperature, but definitely the BMP180 will not, as it is rated for the max temperature is 85C, and so the MQ-5 sensor, which is only rated at operating temperature of 50C. Trying to protect them, enclosing in any form of thermal protective cover, will likely result impairing the sensor sensitivity, giving you unreliable readings.

    You might get away with using the LM35 this way, but for the other two I'm afraid you will need industrial grade sensors, like for example this absolute pressure sensor.

    Unfortunately this will push up the costs for your project quite substantially.

    One question: MQ-5 is a Gas detector sensor, how are you going to use it as humidity sensor?

    Fabio.

     

    P.S: For the dust problem, as correctly pointed out, you need to know the dust particle size to make any informed decision.

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  • 0 in reply to gecoz

    Good point, I hadn't even considered questioning the sensor selection.

     

    I was thinking about the Temperature Sensor - I thought about how easy would it be to encapsulate it within a metal sleeve for protection - like a simple temperature probe uses.

    I realised that the sleeve would affect the response time of the probe though - it has thermal mass unfortunately - it needs to be heated to transfer that heat to the probe (and of course it retains heat once the source is removed).

    I had a little play to see how badly it was affected. Sticking one in a cup of hot water took around 35 seconds to climb from ambient (23 deg C) to the water temp (around 85 deg C), not ideal.

    Worse still, when removed it took around 1:30 mins to return to ambient (it does slow when nearing the actual temperature measured in both directions, but you get a general gist of the effect).

     

    So, exactly as says, it will seriously impair the sensitivity. How quick you need it to respond - if it is slow enough - may negate this issue, or reduce its negative effect.

     

    Regards