PT100 Signal Conditioning , LED's and Arduino Uno

Other Hardware Sensors
1

Hello all

Just started working with the Arduino Uno. I have completed most of the basic projects so I thought I'd be a little more adventurous...

I have a PT100 which I have designed a signal conditioning circuit for which consists of a Wheatstone bridge, Instrumentation Amplifier and low-pass filter.

I have a supply voltage of 5 volts DC going into the circuit. I am getting a voltage range of 0.5 volts to 4 volts output.

Is it just a case of connecting this to the analogue pin of the Arduino board and writing a programme?

I would then like to design code for the Arduino that would turn on/off LED's at certain temperatures.

Any advice would be much appreciated

Thanks Robert

2

The analogue inputs can handle up to 5v so this is ok to connect directly. (Make sure the Gnd is also common.)

A full circuit may help us to advise on the program.

Weedpharma

3

Hello

I have attached a copy of my circuit.

Thanks for the advice

circuit.pdf (17 KB)

4

Seems like a complicated circuit for temperature sensing!

If the output varies with a peak of less than 5v, simply read the analogue input and check the value. If the value is what you want, then turn on a LED. If not, then turn it off.

When you check the value use > a value, not an exact value as the reading will vary around a point.

Weedpharma