Mackenzie Cox Posted August 10, 2022 Share Posted August 10, 2022 I have a pressure sensor that needs a positive and negative voltage in addition to the voltage output to the DAQ. How do I connect the wires to my USB 2416 so that this can function properly? Link to comment Share on other sites More sharing options...
0 DAQman Posted August 10, 2022 Share Posted August 10, 2022 Hello Mackenzie, The USB-2416 cannot be used to power sensors, instead you must provide it. Could you let me know the make and model of the pressure sensor? If it's of the type I believe it is, you may need only one supply, such as +12 volts. Best regards, Johhn Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted August 11, 2022 Author Share Posted August 11, 2022 I am using a 0-10VDC output, 4-pole micro M12 Plug, 0-100PSI pressure sensor. I have attached the link to product specs and wiring diagram.https://www.mcmaster.com/3196K327/ Link to comment Share on other sites More sharing options...
0 DAQman Posted August 11, 2022 Share Posted August 11, 2022 "DC voltage output transmitters connect using three wires—two wires into the power supply and a separate wire that sends a signal to the receiver. The receiver and the transmitter share a common ground wire back to the power supply." The question then becomes, do you connect the power supply to the (+) & (-) pins or between GND & (+). I believe you use the (+) & (-) for power. You cannot use anything less than +14 volts, but a +15, 18 or 24 volt power supply will work. Connect the (Output) pin to the USB-2416 CH0H and the (-) pin to CH0L. Add a 100k ohm resistor from CH0L to GND on the USB-2416. This is a differential connection and is preferred. You could also set the USB-2416 channel to single-ended mode. This may be easier because because all you must do is connect the Output to CH0H and the (-) to GND on the USB-2416. If you have long wires like six feet or more, use the first method because it will provide better noise rejection. To scale the voltage reading to PSI, simply multiply the voltage reading by 10. Best regards, John Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted August 11, 2022 Author Share Posted August 11, 2022 Okay, thank you that is very helpful. Do you have any insight on how to connect this soil moisture sensor as well? I may have to contact the supplier as the wiring diagram does not seem to match reality. There are two additional wires on mine that are not pictured here, but I would be curious to see if you knew how to connect this before I do that.https://www.seeedstudio.com/RS485-Soil-Moisture-Temperature-Sensor-S-Soil-MT-02-p-4634.html Link to comment Share on other sites More sharing options...
0 DAQman Posted August 11, 2022 Share Posted August 11, 2022 Your soil moisture sensor is not analog and instead it's a digital sensor that has a modbus RS485 interface. You will want to use something like this:https://www.amazon.com/Icstation-Resistive-Soil-Moisture-Sensor/dp/B076DDWDJK or this: https://wiki.dfrobot.com/Waterproof_Capacitive_Soil_Moisture_Sensor_SKU_SEN0308 both of which output an analog voltage for the moisture %. Best regards, John Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted August 29, 2022 Author Share Posted August 29, 2022 Do you have any insight on how to hook up these flow rate monitors?https://www.omega.com/en-us/flow-instruments/flow-meters/turbine-flow-meters/bv1000-2000-3000-series/p/BV2000TRN250A Link to comment Share on other sites More sharing options...
0 DAQman Posted August 29, 2022 Share Posted August 29, 2022 This sensor requires a device that can read the frequency of its square wave output. The USB-2416 does have a Counter input that could be used for this, but it would require the DASYLab software to measure frequency. Our basic software packages (DAQami & TracerDAQ) cannot. Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted August 30, 2022 Author Share Posted August 30, 2022 Okay, I am looking at other options. I need one that outputs either voltage or current, right? Link to comment Share on other sites More sharing options...
0 DAQman Posted August 30, 2022 Share Posted August 30, 2022 That would be best, but another option is to purchase DASYLab Lite ($499). It has the ability to convert the square wave flow sensor signal to a frequency measurement using the counter input. If you own LabVIEW you could use it too to make the measurement. best regards, John Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted August 31, 2022 Author Share Posted August 31, 2022 Going back to the set up of the pressure sensors, I have everything set up, but I am getting a reading that increases linearly with time. Any idea what could be going on here? Link to comment Share on other sites More sharing options...
0 DAQman Posted August 31, 2022 Share Posted August 31, 2022 The 2416 is isolated from ground and if the signal is also isolated, the measurement appears float - up in your case. So you need to provide it a reference point to make the measurement. Connect a 100k ohm resistor from the 2416 CH L input to GND. for example The resistor provides a little bit of current as a path to ground but maintains the benefits of a differential input. Link to comment Share on other sites More sharing options...
0 Mackenzie Cox Posted September 9, 2022 Author Share Posted September 9, 2022 I was able to connect this fine, but am still unclear as to where the output wire of the sensor needs to be connected. Link to comment Share on other sites More sharing options...
0 Fausto Posted September 9, 2022 Share Posted September 9, 2022 Hello @Mackenzie Cox. You have multiple posts for the same request. "Please adhere to the following rules and guidelines when posting on the Digilent forum." https://forum.digilent.com/forum/39-measurement-computing-mcc/#elForumRules Link to comment Share on other sites More sharing options...
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Mackenzie Cox
I have a pressure sensor that needs a positive and negative voltage in addition to the voltage output to the DAQ. How do I connect the wires to my USB 2416 so that this can function properly?
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