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IDAC conversion to VDAC (enabling two IDACs)

juanes.pazj

to convert a current source to a voltage source I used a voltage follower OPAMP that would not consume current so if that current was redirected through a Resistance then this Resistance would generate the requiered voltage for my signal

image

When routing the OPAMPS make sure to pick the right pins (this ones are dedicated) you can find them on the Pioneer Kit Guide (apendixes.- Pin layout)

The commands requiered on the firmware are this ones:

->Initialization

 

IDACP_Start();

IDACP_SetValue(motP);//67

OpampP_Start();

 

///IDAC YAW   

IDACY_Start();

IDACY_SetValue(motY);//118

OpampY_Start();

 

Command (Change value)

IDACY_SetValue(motY);//118

IDACP_SetValue(motP);//67

 

this project will be part of a twin rotor control system once It's finished I'll try to post some info about it. for those who havent heard of it it is some how a helicopter fixed on a hinge and the goal of the project is to create a control system that can work with multiple input sensors and finally stabilize the helicopter automatically.In order

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  • Hi Juan,

     

    Very interesting project you have in the making. Would love to see how you progress with this!

     

    For the IDACs -

    There are 2 CapSense IDACs on the PSoC 4, but only one of them is 8-bit. The 2nd IDAC is a 7-bit resolution. Using the Component Configuration Tool you can select the resolution setting, and then use both IDACs in a single design. See my screenshot below.

    image

     

    P.S: An alternate solution could be using PSoC 5LP - it  has the two IDACs, but also 8-bit VDACs that you can use to generate voltages (remember you have a PSoC 5LP on this Pioneer kit as well!)

     

     

    For the Quad_Decoder -

    We have two of these included with PSoC Creator. "Quadrature Decoder [v2.30]" which is UDB hardware-based, and the "Quadrature Decoder (TCPWM mode)" which is using the 4xTCPWM hardware blocks (no UDBs used, but you'll lose one of your Timers). Refer to the datasheets of these to see how they're slightly different from each other.

     

    Good luck with your design and hope to see more from you!

  • in reply to cy.gul

    Thanks for your reply Gagan!

    I'll try to update it as often as I can...

     

    as for the PSoC 5LP I would need a programmer right?

    JE

  • in reply to cy.gul

    I can't seem to find the right pin for the IDAC I know one of them is the P3[0] how can i tell which one will work there??

  • in reply to juanes.pazj

    You can either 'program' the PSoC 5LP using an external programmer, the MiniProg3

     

    Or you could simply 'bootload' firmware into it over USB, no extra hardware required! See our example posted here Project#36

     

    For the IDACs, you can use any pins! P3[0] and any other pin on Port 3 should work just fine to the two IDACs. Let me know if that works out ok.

  • in reply to cy.gul

    finally got it to work! thanks for your feedbak Gagan! I updated the post