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    • #2068 Reply
      Alistair Balharrie
      Guest

      I have built up a 6 solenoid version, but having difficulty in getting the correct voltages.I have 12v and 5.7v in the correct rails for the solenoids and into the Arduino. However when the program runs I am only getting 0.4v at pin B of each tip120…..
      Should the Arduino light when the usb is connected and no power switched on to the power supply on the board?
      The program seems to trigger each Tip120 ok as I have LED’s that light in the correct sequence, albeit faint due to low voltage.
      My Standby and active LEDS have 2.2v across them when active.
      My Solenoids are not triggering i feel due to the low voltage across the TIP.

      Note: I have just noticed that the small blue LED on the step down power supply is also lit when only the USB cable is connected and power is switched off to the board.

      Any advice much appreciated

    • #2069 Reply
      Alistair
      Guest

      Let me expand one question.
      When the program runs what voltage is expected at each pins a9-a4 when triggered.

    • #2070 Reply
      Alistair
      Guest

      Tracked everything back and sorted now.

    • #2071 Reply
      Martyn
      Keymaster

      Sorry for the late reply. Busy at work.

      What was the issue?

    • #2081 Reply
      Brian
      Guest

      Hi Martyn just a quick question on your diagram can you use a Arduino nano instead of a uno. if so do I need to change any code.

      Thanks in advance
      Brian

      • #2082 Reply
        Brian
        Guest

        sorry that should have been the other way round can you use a uno instead of a nano

    • #2083 Reply
      Martyn
      Keymaster

      You should be able to use the Uno without making any changes. Just use the same pin outs.

    • #2089 Reply
      Brian
      Guest

      Thank you for the reply Martyn parts on order so will give it a go

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