I want to run my Arduino Mega on a single 240v to 12v DC supply that I have.
The 12v DC output is rated at 1a
My circuit will be quite simple:
* Power Arduino Mega - it will run Ethernet, RTC Clock, and a Relay board used to turn on and off the solenoid
* Power a 12v solenoid - seems to pull about 300m-500ma (not sure of the startup current) - see http://nicegear.co.nz/robotics/12v-solenoid-valve-34/
The relay board is from EBAY - see http://www.ebay.com/itm/1-Channel-5V-Relay-Module-for-Arduino-8051-AVR-PIC-DSP-ARM-/180982430549?pt=LH_DefaultDomain_0&hash=item2a2364bb55
Directly wiring up the solenoid to the transformer seems to work fine turning it on an off.
I am planning on just splitting the 12v between the Solenoid and Arduino.
My question is how much of a drain does this put on the Arduino? Could it cause it to lockup while switching on/off?
Should I add any sort of "protection" to the Arduino side of the power supply? If so what?