my group and I have been trying to build a cocktail-mixer for a school project. We looked at this project as a general guide: Cheap portable Cocktail maker Barbot with App! - Arduino Project Hub (however with not the same parts or wiring etc)
The goal of the mixer would be connecting to the ESP with an app over bluetooth and selecting from a list of predetermined drinks, but at this point we'd be happy just to get the pumps working correctly.
We've progressed to the point where we have an ESP32 hooked up to two relays, each with four outputs connected to 24V pumps and when trying to run a simple test code to individually run the pumps it just activates some of the pumps for a random amount of time. This leads me to highly suspect that it's some kind of a hardware problem or the shitty relays with no documentation that our teacher provided us. Also, a quirky issue we discovered is that once we turn the power on, the ESP32 just completely stops responding in the IDE-software. If the power isn't on, we can connect to it via bluetooth and send commands etc.
Here's an imgur album with some photos of the wiring, parts etc: Cocktail thingy - Album on Imgur
The project is supposed to be done soon and we've hit a deadend, and even the teacher doesn't know where the problem is haha. Any help or pointers would be appreciated! Please let me know if you need any more details.