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Found 5 results

  1. This projects implements a custom function generator (FuncGen) implemented in VHDL on Nexys 4 DDR board using PmodDA4 and PmodAD2. Command signal to the function generator is supplied from Matlab through on-board UART bridge as a 16-bit long command word (unsigned integer). Digital command signal is converted into corresponding voltage signal by DAC (Pmod DA4), which can be used to drive external device. Feedback, implemented on the ADC (PmodAD2), allows user to read the actual level of the voltage signal. The feedback signal is sent back to the DTE (PC, Matlab), using the same UART bridge. No
  2. Hello, dear collegues! I work with Nexys Video board. I use VHDL. Now I try to create project with PmodDA4. I have 4 variables which I obtained inside the project and I want to obtain it like 4 analog signals. I have found an example, but when I tried to implement it for my board it does not work (code is bellow)... If it is some example code for this PmodDA4, please send it... I could not find it for this board. -- The four left-most switches (SW15-SW12) define the command, i.e. 0011 -- The four switches after (SW11-SW8) define the address, i.e. 1111
  3. Hello. I found similar question “Working with DA4 PMOD on Nexys 4” posted on 23 Oct. 2014 and answer from JColvin. I understand the hint about usage of internal voltage. Nevertheless I don’t see output voltages. It is not easy to me to follow applied code, because I have learned so far Verilog and example is given in VHDL. I am electrical engineer and programmer by education, but I am new to digital electronics and FPGAs. I have acquired some initial experience by learning book “Digital Design Using Digilent FPGA Boards. Verilog/ Active –HDL Edition” by Richard E.Haskell and Darrin M.Hann
  4. Hi, I was working with the PmodDA4 to get it up and running, but was having trouble to get it to work since I didn't know how the 32 bit Word the reference manual claimed I needed to send was supposed to look like.
  5. Hello! If you have ever used something that produced sound through a speaker, than you have indirectly used a Digital-to-Analog Converter, or DAC for short. Many tutorials on how to use a DAC will cover how to use a R-2R resistor ladder which is one of the popular ways that DACs are constructed. However, not very many explain how you might use a DAC that is already created in a small IC chip, such as the one present on the PmodDA4. But no more! You can learn more about DACs in general from the Digilent Blog as well as how to use an IC DAC from this Instructable.