Connecting power external power source of pump connected to relay shuts down sensors

Other Hardware General Electronics
21

This is my reaction to the schematics in post#1:

  1. Feed the board with +12V from the AC/DC adapter (barrel jack or VIN). Let the on board regulator deal with the voltage spikes, it can easily power the board itself.
  2. Feed all sensors, the display and the relay unit with +5V from the AC/DC adapter (redraw the relay unit to incorporate the +5V connection at the input side).
  3. MIND THE COMMON GROUND. Voltage spikes propagate through the ground connections as easily as through the positive connections.
  4. Add a fly-back diode to the pump motor.
22

We've moved on quite a bit since post #1

23

I tried setting up the system in this format, the system works just fine but the only problem now is that the pump has no power to draw the water it’s working but with no strength to draw water …. What could be causing that

24

Make sure you have the diode in the right direction.
Bad solder connections
Power supply doesn't have enough current
Pump not big enough
Water hoses too long
Wires too long
Pump damaged by running it dry

25

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