Problem with connecting Arduino by battery

Development Tools IDE 1.x
1

I don't know if this belongs here, because I don't know what causes the problem

If I connect my Adafruit i2c soil moisture Sensor with the Arduino connected to my PC everything works fine. When I connect my relay with my Arduino connected to a battery everything works fine too. But it gets weird when I connect my Sensor. Somehow the sensor stops working. But when I touch any wire connected it works again. When I tested it, the sensor could still pick up about the value 600. I'm very confused and have no Idea, what the problem could be, because, when I touch a wire everything works fine.

Demonstration:
https://drive.google.com/file/d/19_Eb7ZxFbM3nJzQWNdU9s7nlC9u3liD_/view?usp=sharing

Schematic:

2847×1833 397 KB 

#include "Adafruit_seesaw.h"

Adafruit_seesaw ss;
int relais = 5;

 void setup() {
  ss.begin(0x36);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  if (ss.touchRead(0) > 1000){
    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    
    digitalWrite(LED_BUILTIN, LOW);
    delay(1000);
  }
}

Could it be, that there is a problem with ground?

I'm thankful for all answers and hope you can help me

2

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