This is my first REAL project and i need some help.
I'm working on a project where I am trying to design a PCB for controlling the environment inside an enclosed cabinet to grow a tomato plant using hydroponics (cannot use the arduino dev board). I plan to use the atmega2561 as the MCU, with multiple sensors to read information, and relays to trigger on fans and lights. Here is where I run into problems, I need 12volts, 5volts and 3.3 volts coming from the same board to power these components. I will be using an AC-DC converter to provide 12volts to the board, but how do I distribute these required voltages to the other components?? here is a list of what i plan to use
- 12Volts : 3 peristaltic pumps and 3 relays(will be using ULN2803 to connect these relays to the MCU.
- 5Volts : MCU, EC sensor, water level sensor, pH sensor
- 3.3 volts : temperature sensor, xbee module
I used TIwebench and exported the designs into eagle but still confused on how to implement them to my design.