How to read your wiring diagram
The board is in the middle. Lines are wires. D9 and A0 are pin names, not part names.
The problem
The generated wiring picture looks like a map you were never taught to read. You are not sure which hole on the board a line is pointing at.
Words used here
- Pin
- A numbered hole or metal strip on the board. Digital pins are labelled D2, D9, and so on. Analog pins are labelled A0, A1. They read sensors that vary, like light or a colour sensor.
- GND and 5V
- GND is ground, the return path for electricity. 5V is the five-volt power pin on an Uno. Most of our QA parts take 5V. Do not wire a 5V part to VIN unless the package says so.
Fix, in order
- 1
Find the board block first. In Overhaul diagrams it is usually labelled UNO. Everything else (servo, sensor, motor, button) is a satellite connected by a line.
- 2
Each line is one jumper wire. Match the pin name on the diagram (for example “Span servo D9”) to the same label printed on the physical board. Count the pins if the print is small.
- 3
A servo usually needs three wires: signal (the numbered pin, often D9), power (5V), and ground (GND). If only the signal pin is labelled, still add 5V and GND. A servo with only the signal wire will not move.
- 4
Wire colour in the picture is a hint. On your pack of jumpers, red often means power and black or brown means ground, but the board only cares which hole you land in.
- 5
If a labelled pin does not exist on your board, you have a parts mismatch. See “The wiring diagram pin is not on my board.” Do not guess a nearby pin without changing the code to match.
Also useful
Still stuck?
If you walked the steps and the mechanism still does not move, write to us. This is the fallback, not the first stop.
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