Hello, In this demo, we needed a transistor that could provide more current to drive the fan, since the analog output channel on this USB DAQ device can only drive up to 2mA. Using the TIP120 darlington pair transistor, you can increase that to several Amps so it works well for this applications which involves driving a DC motor.
@Gg180789 Vineet is using a Hall Effect Sensor. This is a come transducer that measures a magnetic field. As the deflector moves, the magnet attached to the bottom moves through the magnetic field produced by the Hall Effect Sensor and the sensor varies its voltage output proportionally. From this you can determine how far away an magnet is from the Hall Effect Sensor just by monitoring the output voltage.
Amazing I think i will go with the cheap $150 NI 6008 12 bit only but will do the trick,i it's a perfect DAQ module for education purposes. I think it can also be done with an arduino usb module coz it has integrated ADC, but the trick is you have to do coding with c++ the cost in this case will be around $ 40.
@alpha001ful You can buy a Hall Effect sensor from a lot of vendors. I suggest Googling it to find a vendor if your area and price range. What NI card you need is dependent on which Hall Effect sensor you get. Each sensor has different current or voltage ranges that would determine which card could work and which one would be cheapest. Once you have your sensor, please call our sales team (ni dot com slash global) and they can advise on the best card for your application. Cheers!
Hello, The analog output channel is connected to the base input of the transistor. When looking at the transistor with the metal shield in the back, the base input is the pin on the left. (Not all TIP120's are the same, so be sure to check the documentation) The next pin on this particular transistor is the collector and the last is the emitter. The battery high goes into the collector and the output current comes out the emitter to the fan motor. I hope this is helpful.
In your waveform graph the data records in real time which allows you to see the graph change. When I try to use a waveform chart or graph, the data just flies by and you can't see any of the actual changes, they just appear as flat lines. How do I change this?
Great! I want to build that device, but I don't understand the way he controls the motor speed. He outputs 5V, but fan is 3V. What's in between? Are there any schematics? Any help is appreciated
Also could you tell me what make of displacement sensor did you use? Although I am decent at programming in general I dont have much practise in communicating with equipment and I want to make sure I get something that is compatible with national instruments data gathering devices.
Hi Vaneet, It was a very good tutorial.Can you please tell how can we get the values of the PID controller that you wrote in labview.I am making a Burner Management System so I want to control the temperature of the boiler using a stepper motor connected to butterfly valve which will control the flow of fuel gas.Its very much similar to your project.The difference is just that you are using fan to control something but I am using stepper motor.
The engineers in our forums should be able to answer this. Try posting your question at forums.ni.com and someone will get back to you shortly! Make sure to include a link to this video for context.
he said in the video -- Trial and error.. Or you could model your plant as a transfer function in MATLAB and apply trial and error in software, as opposed to long real experiments. Since this was 8 years age, Im sure you probably already have an answer now
Where can we buy Hall effect sensor ? what type? what kind of Daq card we need ? Will the cheap one ($150) works or we need 6211($800) ?i need help ...
