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If it is an automotive application, you should use J1939. Even if you are an experienced programmer, it will take at least several months to implement it. Also you must verify the operation of it for a while. If you are using Microchip products, Microchip provides a J1939 stack with limited...
Hi,
Answers to your questions:
1- In CANopen, the main role of the master is to manage communication states (reset, start/stop) of each node in the network. Exchange of data is carried out using PDOs for realtime data and can be done without a master if startup conditions of nodes are set...
For introduction to SAE J1939, I highly recommend you to read following presentations.
https://www.esd-electronics-usa.com/Shared/Library/J1939/SAE%20J1939%20Extended.pdf
https://www.simmasoftware.com/j1939-presentation.pdf
For more information you should get SAE J1939 specifications...
Is 1 ms periodic timer sufficient for this purpose? I think the calculation of next value of PID should be less than a few hundred us with my MCU. Could you show me a piece of pseudo code to achieve it?
Hi again,
I would like to learn that how I can superimpose PWM and dither. I had a look at a valve controller. It doesn't have additional circuit for dither.
Hello,
Make sure that you choose correct chip in settings. Device ID 0x9a0 corresponds to PIC16F877 but your chip is PIC16F887 (ID = 0x2080). It's correctly identified by your PK3.
@FvM
How can I implement it?
@WinRFP
Indeed low frequency PWM might be sufficient.
I have investigated some of commercial valve drivers. The following parameters are sw configurable: Imax, Imin, ramp times in ms (up-down), dither freq. and amplitude. I will try to do the same thing. I am not...
Hi all,
I want to design a proportional valve controller using closed loop (current feedback) method. I have found some documents regarding it. Please see the links below. As you know a dither signal is used to reduce the effect of stiction and hysteresis.
**broken link removed**...
I forgot to say that I use a single supply rail to rail opamp (TS9222).
@chuckey
I have already tried it (with 10M resistor). But I couldn't get a good result.
%1 accuracy over whole range (0-10 kHz) is sufficient. I will use capture mode of a timer to measure frequency of square wave.
@FvM...
Hi all,
I need to design a circuit to measure the frequency of sinusodial input signal. The max. input voltage is 50V RMS. The max. frequency of signal is 10 kHz.
In the schematic shown below there are two circuits for frequency measurement. I tried 2nd circuit with a sine wave over whole...
Thanks for your reply.
Indeed any voltage above the schmitt trigger high input level should be interpreted as logic high. The 4 to 40V range is guranteed to be logic high.
I designed a similar circuit to your suggestion to measure frequency even in an amplitude level 50mV. But the circuit...
Hi all,
I am designing a digital input circuit. It should accept the input state as logic high from 4V to 40V. I will also use the same circuit to measure the frequency of input signal (PWM). The frequency to be measured is up to 25kHz. The input will have a pull down or pull up resistor...
Hi everyone,
I am intented to design a universal input to interface a 3v3 MCU for a generic I/O module. I investigated some of commercially available modules. Each of universal inputs can be configured (user selectable) any of the following options :
Voltage input = 0-5V, 0-10V
Current input =...
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