PCBPT - a Compact Desktop System that Helps with Automatic PCB Debugging

What is it about?

PCBPT is a DIY probe system designed to simplify the process of testing PCBs, by automatically probing desired signals. A custom-designed GUI can parse EAGLE PCB design files and list all networks in the design. The user can just choose the desired signal to be measured, then the software will choose the proper pads for the selected signals, and control the PCBPT probe machine to probe the pads. With the probes connected to a USB oscilloscope, the user can immediately check the measurement of the desired signals. With the help of the PCBPT, when debugging PCBs, all that needs to be done is just selecting signals and checking the outputs.

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Photo by Pim Chu on Unsplash

Photo by Pim Chu on Unsplash

Why is it important?

PCB debugging can be tricky. For example, if we want to use an oscilloscope to measure signals of interest in the PCB, we need to locate them in the schematic and select the appropriate pad for each signal on the PCB layout on which to put the oscilloscope probes. This process hence requires frequent switching between the schematics and the PCB layouts. Moreover, our hands may not be precise and stable enough to accurately place the probes on the pads without causing short circuits with adjacent pins, which can lead to further issues. Additionally, if multiple signals need to be tested, two hands will not be enough. Probe hook clips can be used, but this often necessitates the use of extension wires that must be soldered onto the targeted pads.

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