Hello, i have working setup based on Arduino UNO + ethernet shield sensors: 2x DHT22, BMP180,LDR,1x relay. Its is working while powered by USB from my PC. But if i try to switch power supply to other source like 12V adapter or 5V adapter (from USB) it LEDs light up but wont start script seems like.
What i try.
- https://www.arduino.cc/en/Guide/Troubleshooting#toc6 i try short TX and RX and also trick with 10k resistor no luck
is something wrong in my code that need PC to start?
Any help please? if so then detailed please im a bit newbee