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[Solved] Power supply querries on/from the UniShield

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(@dav4122)
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Joined: 11 months ago
Posts: 10
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I am thinking about how the power supplies are wired up to/from the base board and riser board of the UniShield

 

I am reading that a 12V power supply is preferred and I should wire it to the base boards VA screw terminal (leaving VB alone for now) Is there power from VA up to the riser board? or would I just wire another connection from the 12V power supply to VS? Or up from one of the VA terminal blocks?

 

Similar to that query if I want to give 5V to the RTD amplifier would you suggest wiring a 5V power supply directly to it, or through the VB screw terminal?
I think you say in this video that
the VR switch selection isn't able to power both the Arduino board and the RTD amplifier with 5V at the same time through the riser board?


   
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(@pbruno3)
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Joined: 6 years ago
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Hi, depends on which UniShield. The MEGA does not have any power pass-through from the base board to the riser board. The ESP32 does from base VA to riser VS through a jumper (connected by default) on the base board. For the ESP32, do not wire VS and VA simultaneously without removing the jumper, and do not wire just VS, as the connection between the riser and base cannot handle the current for the driver outputs.

VA and VB should be considered inputs - do not draw power from them. If you want 5V for the amplifiers, you can use the VR pin, which will have 5V on it (assuming that is what the onboard power supply is set for). That said, if the ESP32 is used, that is a 3.3V board - so you should not power the amplifier with 5V, you should match it with 3.3V. These don't draw much, so you can use the 3.3V from the ESP32's regulator.


   
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(@dav4122)
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Joined: 11 months ago
Posts: 10
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Thanks! That answers those questions perfectly


   
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