Welcome to my next blog post, today a very short piece about cable colors. In electronics, it is crucial to always check the polarization of cables, especially when dealing with power connections. The color coding can often be misleading, leading to potential issues if not verified correctly. I want to write about why standard assumptions do not always hold true in practical applications. This post covers a specific case involving drone camera power supplies where battery depletion during long flights necessitates external power sources. Through micro USB connections on flight controllers, we supply five volts and ground. However, relying solely on color labels can be dangerous. I will demonstrate how unusual configurations exist compared to standard red and black pairings. Always verifying polarity is essential to prevent equipment damage.

Understanding Common Color Assumptions

You usually assume that if you have a red cable and black cable, the red one is always the positive, the black is always the negative, there can be some variations. Like maybe you have a red and white, then red still should be more likely five volts. The white one would be the GND. On the other hand when you have the pair of white and black, then the white is five volts, the black one is the zero volts so ground.

An image showing four cables connected to a flight controller setup.

The Reality Check

Now back to the picture, if you look closely I will let you guess which one is a different one. Basically which one does not fit the pattern. You can see that the first one from the left is actually different because it has a red color and something like a grayish one. When I initially created a connector for this I assumed that one must be the positive pinout. But I couldn’t be more wrong. The positive is the gray one, this one, grayish one cable.

Safety Precautions

Whenever you are trying to connect something and you are not familiar with the installation with the cables, don’t trust the colors. Always try to measure them before planning them in because you can plug them in reverse polarity and destroy your edge device.

In summary, this blog post highlights why cable colors in electronics can be misleading and why you should never rely on them blindly. While standard practices suggest red is positive and black is negative for five volts and ground outputs, variations exist that contradict these expectations. As demonstrated with the drone camera power supply setup, assuming a specific color coding without verification led to an incorrect pinout assumption regarding the positive and negative connections.

It is vital to understand that relying on visual cues alone can result in mixed polarization. This poses a significant risk when connecting power cables to sensitive equipment like flight controllers or cameras. If you are unfamiliar with a specific installation, always measure the voltage before connecting the wires. This simple step ensures you avoid reverse polarity issues which could otherwise destroy your edge device permanently. By verifying the actual output rather than guessing based on color, you ensure the safety and longevity of your electronic components during long flights and operations.