![electronics - How to check if all pins are connected on my board to make sure Arduino sends the correct pattern number on my tool - Arduino Stack Exchange electronics - How to check if all pins are connected on my board to make sure Arduino sends the correct pattern number on my tool - Arduino Stack Exchange](https://i.stack.imgur.com/VoSVn.jpg)
electronics - How to check if all pins are connected on my board to make sure Arduino sends the correct pattern number on my tool - Arduino Stack Exchange
![Any idea why my relay (pin 2 is switching on when set to LOW and off when set to HIGH?) it is not the if statement as I have taken the HIGH Any idea why my relay (pin 2 is switching on when set to LOW and off when set to HIGH?) it is not the if statement as I have taken the HIGH](https://preview.redd.it/xh2e5ak8ho271.jpg?auto=webp&s=acd9adedec6f11d348c07c17620beeef19503cc4)
Any idea why my relay (pin 2 is switching on when set to LOW and off when set to HIGH?) it is not the if statement as I have taken the HIGH
![Pin Change Interrupts - Difference in PORT Read & DigitalRead - Programming Questions - Arduino Forum Pin Change Interrupts - Difference in PORT Read & DigitalRead - Programming Questions - Arduino Forum](https://aws1.discourse-cdn.com/arduino/optimized/4X/7/6/6/766f6680270655b0392b2f43329bfa1ac7b48f97_2_677x500.png)