Hi there, I hope all here are doing well.
This is my first post on this forum so if I'm making any mistakes or missing any usual forum etiquette please let me know.
So my project is relatively simple, I am controlling 2 UVC light LED strips with an Arduino Nano, two HC-SR04 ultrasonic sensors and a dual channel relay switch. The entire circuit is powered using a 6.4V battery supply with high capacity batteries (3200mAh). The way the circuit should work is that the sensors act as a motion detector, and if a person or any presence is detected by either sensor, the LED strips need to be turned off. The LED strips are designed in such a way that they are powered by a mini usb input but the circuit of the strip is naturally open and the two open points need to be closed for the LED's to turn on, hence the relay switch. The relay is connected to be normally open for both strips and closes when any of the sensors detects anything.
The problem that I'm having is that there doesn't seem to be enough power supplied to the circuit to power everything. When the LED strips are on (circuit shorted or closed) the sensors are not able to detect anything and the relay switch doesnt flip (I've also noticed the on LED of the arduino nano is dimmer as well as the LED's on the switch), however, when the LED strip circuits are open, the sensors and relay switch work just fine. I've also tested the circuit using a multimeter and found that the voltage supplied to the Arduino when the LED strips are on is only 2.5V, while it is about 4.7V when the LED strips are not powered and the sensors work with the relay.
So I think the obvious conclusion here is that the LED strips are drawing too much power when they are turned on. The problem is I don't know where to go from here, if the issue is related to current or voltage, if I need to use a more powerful battery or if my circuit is just poorly built. If anyone has any recommendations it would be greatly appreciated. The attached image shows my circuit (rough, not exact). Thank you to anyone who took the time to read through all this.