SparkFun Forums

[wmaalouli]

Hi.
Are all the analog inputs on the weather shield used? I'm trying to use a TIP36 temperature sensor with it using one of the analog pins but I'm getting wrong values. I tried all 6 pins with similar results. This is not an issue when the shield is not in place.

[wmaalouli]

I'll answer my own question. The weather shield utilizes all 6 analog inputs on the Arduino, so that precludes using anything else with these pins unless one forgoes some sensor availability.
I opted instead to use a single wire temperature sensor (DS18B20) with one of the free digital pins.
It might help to have that kind of information in the description page for the future.

[darrellg]

You could also have used a multiplexer to select between multiple analog inputs using one analog input and some digital outputs. The article at http://playground.arduino.cc/Learning/4051 describes how to do so.

[wmaalouli]

You could also have used a multiplexer to select between multiple analog inputs using one analog input and some digital outputs. The article at http://playground.arduino.cc/Learning/4051 describes how to do so.

Thanks for the tip. That actually might come in real handy in the future. It certainly would work with the Sparkfun weather shield, but I will need to rewire one of the sensors analog input to the multiplexer (or more if I needed more anolog inputs) and cut some traces on the shield.

[DocWu]

If you don't need the power/voltage input you could cut a trace and use A3.

Or you could find an I2C temperature sensor.