Honeywell micro

Hello!

I need to read state of a microphone, I have the following model:

http://sensing.Honeywell.com/micro-switch-914ce-limit-switch-914ce1-3A-HighRes.jpg

I have a card cDAQ NI 9209, V +-10. If I get a block of POWER 10 Vcc and connect this special microswitch with PSU and the NI9209, would that work? Do I need to use resistors to protect the DAQ module? Sorry for the stupid question, I'm not an electrical engineer

Thank you!

It should work, but a few comments:

First of all, I would not use a 10V power source. All you really need is enough to see a voltage change when the switch changes state.

Second, you will need a resistance. Try Googling "pullup resistance." You will find info on how the size of the resistance and he wire upward. The purpose of resistance is not to protect the DAQ of entry, it is to protect the power supply and the switch. Depending on how sophisticated the power supply is, matching its production directly to the mass can cause it (or switch) for FRY - or at least crowbar power.

Third, for later use, the way preferred to read a closing the switch as it is with a digital input. With an analog input, the latency (how long it will take to detect that the switch has changed state) is based on the analog sampling frequency. For example sampling at a frequency of 1 Hz only allow you to see the changes once per second, while sampling at a rate of 1 kHz will allow you to see the state changes every millisecond.

Fourth, there is something which is called "indirect contact". Basically, when a pair of contacts nearby they don't components snap together and that's it. Rather than if the contacts are "wet" (a thin layer of mercury is current) contacts will bounce for a few milliseconds before the closure of decanting.

Mike...

Tags: NI Software

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