Powering Arduino and it Sensors And Motor Shield

[system]

Hello Guys ! I am new to Arduino. I am using

• Arduino MEGA2560 R3 http://www.duino.lk/Mother-Board/Arduino-Mega-2560/Product-Code-965318

• Three Water Level Sensor http://www.duino.lk/Arduino-sensors/Water-Level-Sensor/Product-Code-9653121

• Two x Load Cell Weighing Sensor Load Cell Sensor 1KG – Microchip.lk

• Two x HX711 Weighing Sensor Module HX711 Weighing Sensor Module for Load Cell – Microchip.lk

• One L293D Motor Driver Shield : http://www.duino.lk/Arduino-Shields/Motor-Driver-Shields/L293D-Product-Code-965353
  With this motor shield I am using

• High Speed Servo Motor : http://www.duino.lk/Arduino-Components/Servo-motors?product_id=112

• Normal Servo Motor : http://www.duino.lk/Arduino-Components/Servo-motors?product_id=129

• Stepper Motor Nema 17: 4-lead Nema 17 Stepper Motor – Microchip.lk

• Two x Submersible Pumps DC Motor Pump : http://www.duino.lk/Arduino-Components/Water-Pump-DC/Mini-Micro-Submersible-Pumps-DC-%202.5-6V

How much voltage, Amp do I need and how can I find a suitable power source . Please help me out !!!

I am very frighten to power up this things

[DrDiettrich]

You need a separate power supply for each required voltage, and each supply must provide at least as much current as required by the devices (motors...) connected to it.

Stepper motors typically are used with higher than their nominal (minimum) voltage, depending on the required motor speed and torque. Use a separate power supply for the motors, and connect it directly to the driver board. The driver must limit the motor current when the stepper motor halts or turns slowly, that's why you should get a modern dedicated stepper motor driver board, the old L293 is really useful only with ordinary DC motors.