I have to find a solution to a current situation. I have a sensor which puts out an analogue signal varying between 1.5 and 5 volts. I want to send it to a device but somehow drop the voltage so that it appears 1v lower than the signal sent. i.e. if it is actually sending 2.5v I want it to be converted to 1.5v, 3.5v to 2.5v etc.
I thought of using an arduino - sending the original signal to an analogue input pin - reading the value and converting it with a couple of lines of code - then putting it out to a PWM pin as the desired value.
I suspect this is a dumb way of doing it and there is a much simpler method that does not involve using a microprocessor.
Can anyone tell me what that method is
thanks in advance