NJ Roadmap
New Member
I am planning to interface a temperature sensor but am yet to choose one because of a question which I still can't seem to answer:
Analog sensor or digital?
The reason why I am straying away from getting an analog one is because the sensor will be connected to a PIC via a fairly long wire (about 15 metres), and am worried that this length can introduce a fair amount of noise and hence reduce accuracy. I could go for a sensor with a variable current output (like the AD590) which would reduce noise problems, but the only ones I've found are too expensive for my project (>£5).
The reason why I am not sure about a digital sensor is because it would have to work over I2C interface (which my PIC supports), but I've heard that the I2C interface is a bit of a pain to get working? The advantage of a digital sensor on the other hand is that signal noise won't affect the readings much because its only 2 widely-spaced voltage levels being read (i.e. it's digital)
Can anyone help?
Happy Holidays!
p.s. the other option is wireless, but again my prototype should demonstrate complete cost-effectiveness, and I'm sure wireless Rx and Tx circuits will bring the cost up by a fair amount? If not, can someone point me in the right direction for wireless Rx and Tx circuits for digital use? I'm a n00b when it comes to wireless stuff!
Analog sensor or digital?
The reason why I am straying away from getting an analog one is because the sensor will be connected to a PIC via a fairly long wire (about 15 metres), and am worried that this length can introduce a fair amount of noise and hence reduce accuracy. I could go for a sensor with a variable current output (like the AD590) which would reduce noise problems, but the only ones I've found are too expensive for my project (>£5).
The reason why I am not sure about a digital sensor is because it would have to work over I2C interface (which my PIC supports), but I've heard that the I2C interface is a bit of a pain to get working? The advantage of a digital sensor on the other hand is that signal noise won't affect the readings much because its only 2 widely-spaced voltage levels being read (i.e. it's digital)
Can anyone help?
Happy Holidays!
p.s. the other option is wireless, but again my prototype should demonstrate complete cost-effectiveness, and I'm sure wireless Rx and Tx circuits will bring the cost up by a fair amount? If not, can someone point me in the right direction for wireless Rx and Tx circuits for digital use? I'm a n00b when it comes to wireless stuff!