Control of a syringe pump for a behavioral chamber -

Community Projects
1

Hi all - Making a custom behavior apparatus and want to control a syringe pump that delivers a sugar solution with an arduino.

As supplied from manufacturer, it uses a 28v control circuit for the 115v motor.

can see innards below:

SyringPumpControl.jpg
SyringPumpControl.jpg453×559 92.4 KB

SyringPumpControl_boardchip.jpg

details here:

https://www.med-associates.com/product/ … to-20-rpm/

So two options

  1. Using a 28v source, is there a controller/switch that will run from the Arduino and do the 28 volt switching, preferable solid state? (There is the beefcake (KIT-1333815 ROHS), but mechanical relay making may be too audible to animals).

  2. Is it easier to find a motor controller shield that will just replace the control circuitry and directly work this motor? And perchance a suggestion to which one?

Thanks in advance

2

Is your 28 volt trigger AC or DC? There’s not much information on the page you linked so it’s hard to determine what you might use.

If it’s AC, a solid state relay like [COM-13015 should work. (Although it’s way bigger than necessary.)

If it’s DC and you want to avoid making any noise, you could get a solid state relay made for DC, but we don’t carry one. An alternative might be to use a transistor to switch the 28 volts or even a [ULN2803 transistor array.](Darlington Driver 8-Channel ULN2803 DIP - COM-00312 - SparkFun Electronics)](Solid State Relay - 40A (3-32V DC Input) - COM-13015 - SparkFun Electronics)

3

Sorry! it is a 28v DC control.

No idea why they are still using 28v (have since the company started - like their Pascal based control software)

4

Looks like the manufacturer is using a super simple SSR setup, and since you already have the pump opened up, you could just replace their circuit board with something the Arduino could drive directly, like a 5V triggered SSR to control 115V to the motor.