Hello, I have the following parts listed below. I was wondering why do I have to connect an external power source to the Liquid Pump (Motor) instead of using a Power Supply connected directly to the Arduino Uno.
1 x Arduino Uno
1 x Base Shield V2
1 x Relay Shield v3.0
1 x Temperature & Humidity Sensor v1.2
1 x Grove 16-2 LCD (White on Blue) V1.0
4 x Peristaltic Liquid Pump with Silicone Tubing - 5V to 6V DC Power
4 x Moisture Sensor v1.4
Hi
Because the Liquid Pump will draw more current so if you connect Power Supply connected directly to the Arduino Uno twill not Liquid Pump work properly because of Arduinoard output current is draw is limited to the maximum current draw of 40mA. So in the case, you need to use external power supply for the motor and Arduino will do the driving.
I didn’t know this information. I found more information about this <LINK_TEXT text=“https://www.electricrcaircraftguy.com/2 … ltage.html”>https://www.electricrcaircraftguy.com/2014/02/arduino-power-current-and-voltage.html</LINK_TEXT>. Is there an Arduino that supports more current?
You can use the VIN pin , VIN is the completely unaltered input power before the regulator.
The Relay Shield utilizes four high quality relays and provides NO/NC interfaces that control the load of high current. Which means it could be a nice solution for controlling devices that couldn’t be directly controlled by Arduino’s Digital I/Os. Standardized shield form factor enables smoothly connection with the Arduino. The shield also has four dynamic indicators show the on/off state of each relay.
We use a lithium battery as the power supply for the motor. Users can select other power sources as well. Of course, a power adapter will be essential when using high-current devices .