I am an absolute beginner and would like some help and guidance with my project.
I have experience in programming back-end servers and websites, but not much in electronics.
I have a coffee machine I would like to alter, because some settings are weird.
For example, 1) default sugar setting is 3 spoons, I want to change it to 0.
2) Change order of making cappuccino. So instead of making espresso first, and pour milk over it,
I want the machine to pour milk first and espresso later.
3) Eliminate front screen with menu buttons and be able to remotely make coffee with my phone.
So there are 2 PCBs in the machine.
Front PCB is the menu board where it stores all data of each coffee selection
Back PCB is the controller board where it controls all motors, valves, etc.
As shown below, these 2 boards communicate in Rx Tx wires only.
I have been fiddling around and my first try was to try read analog Data, and immediately pass through arduino and write analog data to the PCB. But the machine is saying there is a comms error.
The wiring are as shown below.
The wiring is right, but there must be something I don't understand that cause the 'comms error'.
Could it be that the data is out of sync? Am I suppose to use analog read and write? Baudrate?
I'm clueless on how electronics really work, so please use beginner words
Any help or guidance would be greatly appreciated.