I'm not the parent but I'm a fan of WeAct's modules. https://www.aliexpress.us/item/3256803150519042.html https://www.aliexpress.us/item/3256803150519042.html

I'm not the parent but I'm a fan of WeAct's modules. https://www.aliexpress.us/item/3256803150519042.html https://www.aliexpress.us/item/3256803150519042.html Fairly cheap but easy to configure with the dip switches and the boards I've been sent have been high quality with good solder joints.