I’ve searched high and low for this, and only found partial data. There are at least two defined sizes, standard (1x1 inch) and micro (0.75x0.30 in), but clearly others exists. Some boards’ mechanical interface drawings can be found by doing a web image search, but not all Qwiic modules have such a drawing. For example, the I2C strain gauge module I just got (Qwiic Scale, P/N SEN-15242) seems to be 1x1-3/8 inches, and no mechanical drawing.
It sure seems like all these modules have been designed with SOME standard in mind, even an informal one. Is this documented somewhere? Things like board sizes, mounting hole locations, recommended connector locations, etc.
At the minimum, is there a drawing of the Qwiic Scale module somewhere (short of loading up the PCB files, since I don’t have Eagle).
I just imported the Eagle files into Altium. The board is 1000x1400 mil, and the mounting holes are 800x1200 mil on centers. Pin 1 on the connector is 250 mil over and 50 mil up from the lower left corner of the board.
Mike, yeah, I’m with you. I did the same myself. But, my question remains, is there a standard somewhere describing the format in general? There seems to at least be the concept of a standard, when you see terms like Qwiic Standard and Micro form factors. I found a group of mechanical board drawings in this SparkFun GitHub repository (see link below), but that hasn’t been updated this decade. As well, that is just a collection of mechanical drawings, and doesn’t include a top-level Qwicc module dimension guideline document. For example, AdaFruit has such guidelines for their Feather and Wing modules.
I suppose one could download the mechanical drawings for all existing Qwiic modules, do a comparison of them, and reverse-engineer the standard. But that’s a lot of effort – surely such a document, even if only in someone’s head, already exists. Maybe it is proprietary, and that’s the reason it isn’t available on the website?
For the Qwiic Scale (SEN-15242), while a mechanical drawing is not directly provided in the search results, SparkFun usually includes dimensions and other relevant details in their product descriptions and hookup guides. If the mechanical drawing is not available on the product page, it might be included in the resources section or within the documentation linked on the page. If you still cannot find the mechanical drawing, reaching out to SparkFun’s customer support or community forum could be a helpful next step to obtain this information.
Remember, when designing your project or integrating various Qwiic modules, it’s always best to refer to the specific documentation for each module to ensure compatibility and correct placement.
