Timer1

I am trying to use timer1 with no prescaler.

I tried this.
TCCR1A = 0; // clear control register A
TCCR1B|=(1<<CS10);

Testing indicates that the divide by 64 prescaler is operating though.

You haven't set TCCR1B to the correct value, you've just ORed in one bit.

Overwrite the whole resister to a known state. Or at least overwrite the whole prescaler field.

Overwrite the whole resister to a known state.

Resister? Like 330Ohms?

PaulS: Resister? Like 330Ohms?

Whoops, register, yes, my fingers sometimes type completely the wrong word all by themselves if I don't check up on them(!)

Thank you, it will teach me not to read instructables.