what is the output and voltage on an 18a chip with 5v goin in. I am planning on putting a 12v solenoid on it n i need to know how many volts it gives out so that i can up it for the solenoid. If you need any more info please say. thanks.
To drive a solenoid, you will need a transistor or other form of current amplifier.
The current requirement of your solenoid will determine the transistor required.
The transistor will determine how to drive it from the PICAXE outptu.