I quickly confirmed the eight diodes were present to dump excess power into the +12V and GND planes. Then I started following copper traces and scribbling my notes.įortunately this was a relatively simple circuit that mostly followed data sheet recommendations. Once printed, I folded the paper in half while holding it up to a light source so I could line up the front and the back.

I scaled them to the same size, and printed them side by side on a sheet of paper leaving room for me to write notes.

I took photos that are as directly square-on as I could front and back. I could probably do it with the actual device in hand and a blank sheet of paper, but this time around I decided to create my own visual guide. And as much as I like to do things digitally, for projects like this I really appreciate the flexibility and immediacy of a sheet of paper to scribble on. The first step was to catalogue all the components mounted on board, and now I analyze the circuit board layout to see how they are connected together. From my understanding this difference is necessary to bias the internal transistors of the driver.As a learning exercise, I decided to generate my own documentation for commodity L298N motor driver modules available wherever hobbyist electronics are sold. The original setup was wrong because Vss of 5v is needed for logic and Vs for motor power must be at least Vss + 2.5V. My setup worked when I used this schematic: PS I have tried changing the L298N driver and I get the same result so it is not a case of the driver being fried. Bellow are pictures of the connections and the circuit. I have read forums related to this on LMR and have not found a solution.

I could appreciate some help as I do not know what I am doing wrong. I used an oscilloscope to measure all the voltages and everything is as it should be but for some reason the outputs always remain grounded. I made a recommended circuit from the data-sheet but for some reason when I pull one of the inputs high (by connecting it to 5V power rail) the motor driver does not activate the motor outputs. I have a simple breadboard robot and I am trying to run a Timya dual gearbox off the driver. For some reason I am really struggling with implementing a simple L298N motor driver.

L298n motor driver schematic