To trigger circuit from phone flash light
button = du30 photoelectric transistor (just provide open wire)
relay x 3= find smallest relay module (3.3v/5v trigger)
source 1= 1 battery lipo (12v) for load ( sensor rs485 milivolt)
source 2= 1 powerbank (5v) for load ( microusb charger port included short cable)
source 3 = 1 powerbank (5v) for load , port usb type A female ( usb wifi modem - LTE 4G Wifi Dongle usb )
https://shopee.com.my/Unlocked-4G-LTE-WiFi-Hotspot-Wireless-USB-Dongle-150Mbps-Modem-Stick-Card-i.89116489.3531096574
source 4 = power to trigger all 3 relay, can tap from source 3
