First i'd like to apologize for this post, there are propably several hundres of answers.
I need to be able to calculate the PSU needed for my projects.
My project consists of: 1 x Arduino Uno http://arduino.cc/en/Main/ArduinoBoardUno 1 x TC35 ver. 3 http://www.ebay.com/itm/270829600250?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 1 x 8 relays board http://www.ebay.com/itm/260932697713?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 1 x Smoke sensor http://www.ebay.com/itm/170633163112?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Setup: 1 x 12v 2.5a psu 1 x 12v 1a psu Uno and TC35 shares the 2.5a psu The 8 relays uses the 1a with a LM7805 voltage regulator for power only. Uses 8 Uno pins to control. This setup seems only to run 5 relays HIGH, stable. Would like all 8.
Is there a formula or application that i can use? Please notice that i'm very new to electricity.
Any help would be greatly appreciated.