Ujjdwiurgh Weevil Eye Electronic DIY Kit Welding Machine for Beginner Learn for Student Experiment Interaction

Put the 20mm coin cell battery into the battery holder, positive side up. Once the Weevil Eye is soldered, test the board's functionality. If it's dark, you should see the LEDs light up. If not, cover the sensor with your finger to test. If your Weevil's eyes aren't lighting up, don't worry! with some simple troubleshooting. Check your solder joints to make sure your components have a good connection to your board - solder should into the board and not ball up around the component's pins. Also check to make sure your transistor and LEDs are correctly oriented!