I'm trying to run this DC simulation, but I cannot connect the current measurement block to the circuit!
Thanks.
Few things:
The black coloured source block that you have added is from Simscape Specialised library. Consider adding something from Simscape-> Sources library (ensure that your network is blue in colour)
Your model is missing a solver configuration block
Connecting a display to the network doesn't measure current, you need to add appropriate sensors to measure the quantity you want. For ex you measure current using a Current sensor, a voltage using Voltage sensor and so on
Fixing the above 3 should get you your output.
Related
The clock configurator in STM32CubeMX does not allow the PLL divider DIVP1 frequency to exceed 300MHz so it is impossible to use it to achieve the board's maximum of 480MHz. To do this you must go into the code for the configurator and manually change the multipliers. Is this confusion on my part or an error with the data provided by ST for the board?
Checking CPU performance singing a hardcoded assembler timing loop the subtract and branch instructions of the timing circuit take two clock cycles. On my Nucleo-H723ZG board these two take a total of one cycle. Is DUAL ISSUING not available on H743?
Once again in the STM32CubeMX in the System RCC section Master_Clock_Output_1 is highlighted in RED. (Conflict with: USB_OTG_FS: Activate_SOF). What is this all about?
You need to have the correct voltage scale (VOS) which affects the maximum clock directly. To clock this device at 480MHz.
As for your pin conflict - the MCO pin is a clock output to use for clocking external devices. Pins in the STM32 chip can be multiplexed such that they can serve multiple functions, such as ADC1_CH4 GPIO_OUT etc... You have a conflict that 1 pin is trying to facilitate 2 functionalities, and such you have a conflict. rearrange the functionality or pin to fix the conflict.
I am trying to develop a MATLAB Simulink model that will help me study the load of my department.
The model works, however one of the blocks goes right over my head when it comes to understanding, as I used the internet to help me with it.
Here is the main block:
The Scope Displays the Voltage, Current & Power
The "dept01" block inputs the data from .csv file and contains only [Time,Power].
Here is what goes inside of the "Electrical Department" Block:
I have no problem understanding this part, I'm simply splitting the total power into three portions.
NOTE: I am also assuming that ultimately Q=0 so Total Power = Real Power
This is the Second Step of the "Electrical Department" block which I cannot understand in any way. Maybe my concepts are weak but this part makes no sense to me.
Can someone please explain it to me that how is the block calculating Voltage & Current using just the Power??? Also how does it imitate the function of a Load so that the Energy Meter sees it as a load?
Thanks!
Load can be emulated by connecting a current source in series with the voltage source as it is seen the diagram. In your case, the controlled current source has been used. It also looks like the dependent current source is derived from the voltage. I request you to give the details of relational operator used and the sigma block. Without which you can not derive the relation ship. If the current is dependent on the voltage like the case, voltage and current can be calculated simply from the power.
I am trying to drive EPD(ED060SD1) using STM32F429ZGT, and got datasheet from display vendor. But there is no specific explanation of how to drive EPD display or details of pin.
So I want to know what those pin does.. and any hint how to run this display..
Thank you
ED060SD1 Pin List
The stm32 series of microcontrollers do not support EPD displays directly. I think you would need a EPD controller in between to make it work.
You night be able to generate just the digital inputs, then use an external HV supply from a chip like HV850 and then step it down with inline Zener diodes. I used this approach to make a microflyer based on a piezo speaker!
The HV850 has on/off via digital line and needs +4.2V minimum, max Vout is +/-59V on alternate outputs which is ideal for this purpose.
Simply add a high value resistor on the output side to let it discharge when the panel isn't being driven.
I'd put it in extclk mode and run it at 10Hz to reduce power usage.
I need your help with the session based interface for the Matlab DAQ toolbox. I have not been able to find much help in the MathWorks tutorials or examples. I am currently using a USB-6003 DAQ from NI.
So basically in my system I have 2 analog output channels (ch1 and ch2) and 1 analog input channel (ch3), and what I am trying to do is to drive the output voltage in ch1 from 0V to 10V in steps of 1V, with ch2 constant and then repeat the loop in ch1 for a different voltage in ch2. As for the analog input ch3, I am triggering it some time after triggering the ch1. My triggers are being externally generated by a function generator.
What I have been struggling with is:
1) How to at each successive trigger event output a different value in the ch1.
2) And how after 11 triggers, can I change ch2 output's.
3) How to save the input in a different location between trigger events, so it does not get overwritten by the next event.
My main constraints are:
1) I cannot use an edge-counter channel to count the triggers because I only have two PFI channels and I need both, one to trigger ch1 and the other ch3 (I cannot use only one).
2) I cannot use wait or any other software time function, because I need a high speed acquisition system (it is for a laser microscope)
3) I need two have at least 2 sessions running in parallel because my DAQ does not allow simultaneous tasks in the same session.
I have attached a channel's time diagram of what I am trying to do.
Channels diagram
Caution
"I need a high speed acquisition system"
USB might not be the right option. Using USB as the control/data transport mechanism is slow compared to other computer I/O, like PCIe or EtherCAT. If, after you get this working, you determine that you need lower latency and jitter, my recommendation is to try CompactRIO and LabVIEW Real-Time.
Compounding the performance is the on-demand nature of the USB-6003. While both analong input and analog output are controlled by electrical signals (the start trigger and sample clock) and have their data automatically transferred by the driver, the digital input and counter are only software-timed, which means that reading data isn't automatic and must be prompted by you, the user, with a read command.
Since the only way you can get digital data from a USB-6003 is on-demand, your only option is to wait for it; there is no way to be notified that a new edge has arrived. Other devices (like the PCIe-63xx X Series or cDAQ-940x devices) support digital input change detection, which causes a software event to be sent to the program. If you had one of these devices, then you wouldn't have to wait.
Suggestion
However, if you change your triggering and data strategies a little, I still think you can achieve the kind of I/O you want. You'll then be able to evaluate its speed and reliability to decide if you need to upgrade DAQ hardware.
New triggering and data strategy
The core idea is: instead of keeping the channels on their own "time base", unify them to a single time base and use that to coordinate the voltage updates. By doubling the frequency of your external trigger, all three channels can share the same timing. In other words, both the analog input task and the analog output task use the same external signal as their sample clock.
Double the frequency of the FGEN's trigger signal.
Repeat an analog output sample if the level doesn't need to change.
Throw an analog input sample away if it coincides with an output level change.
The analog output samples would be:
ch1 ch2
0.0 0.0
0.0 0.0
1.0 0.0
1.0 0.0
2.0 0.0
2.0 0.0
0.0 1.0
0.0 1.0
New program strategy
Now that both the analog input and analog output are using the FGEN as their sample clock, the MATLAB routine only needs to prepare the operation and then monitor/feed it. The hardware will be able to generate and acquire without any intervention from the PC, but the PC will need to periodically read analog input data and write more analog output data to keep the driver satisfied.
I don't know how much of the DAQmx API MATLAB exposes, but you can ask the driver how many samples are left in the device's buffer
Analog input is DAQmxGetReadAvailSampPerChan (doc)
Analog output is DAQmxGetWriteSpaceAvail (doc)
Reference
NI USB-6003 Specifications
http://digital.ni.com/manuals.nsf/websearch/666A752FCC177B0186257CD8006C24C8
Is it possible to use the previous value of the time varying variable
for eg:
Suppose I have pipe whose inlet temperature is 298K with a specified uniform mass flow(m_flow), now suppose i am heating the pipe using a heater of 100 watts.
The outlet temperature will be attain a higher temperature of suppose 302K, now if i have to use this outlet temperature as my inlet temperature (in the sense i am recircuilating the water), how would i be doing it?
is it possible to update the value of the inlet temperature based on the outlet temperature at the previous timestep? so that for the next iteration the inlet temperature will be the same as the oulet temperature in the previous iteration (in other words the fluid would be recirculating).
Thanks
You cannot access the value in the previous time step. The closest you can get in Modelica is using delay(exp,T) to get the value T units of time ago.
The timestep does not enter into it at all. A model that uses information about timestep is just wrong. Nature doesn't know or care about integration time steps, the model should reflect that.
It seems to me what you want to capture is transport delay. Transport delay is the delay introduced by the time it takes for molecules, electrons, etc. through the system. So presumably what you wish to model is the time it takes the inlet fluid to reach the exit. Again, this has nothing to do with the integration timestep but rather the velocity of the fluid and the distance it must travel. Once you know how long that takes (by either a priori knowledge of the system of by looking at the simulation results themselves), you can follow Marco's suggestion of using the delay operator.
In order to setup a proper model for the system you described I suggest you to look at the example :
Modelica.Thermal.FluidHeatFlow.Examples.IndirectCooling
of the modelica standard library ver. 3.2. Instead of one pipe you can put an ambient or control volume component to better suit you needs. Moreover using continous and differentiable equations (the delay function is not) you will benefit from some of the advantages of the Modelica code, e.g. you will be able to reuse your models in a much wider range of cases, solve inverse problems, solve initial value problems, ...
I hope this helps,
Marco