Can somebody tell me what this filter do?
Thanks
Thanks
Attachments
-
3 KB Views: 1,445
That circuit is an adjustable amplifier, not an active filter. LM35 output is probably not going to go high enough to drive PIC input. You should amplify so that highest expected temperature reading is close to 5V and lowest is close to 0V - given that you are powering your PIC with +5V and ground. This will allow you to convert the voltage into temperature with a higher sensitivity.I found this LM35 interface circuit in erics blog.
My question is why eric uses a opamp circuit, why not directly connecting LM35 to PIC.
If I use this circuit what gain do I need to adjust?
Suraj,I found this LM35 interface circuit in erics blog.
My question is why eric uses a opamp circuit, why not directly connecting LM35 to PIC.
If I use this circuit what gain do I need to adjust?
Hi ericgibbs I use 10bit right justify.Suraj,
Is the PIC's adc set to 8bit or 10bit.??
hi,Hi ericgibbs I use 10bit right justify.
The maximum LM35 goes to 1V.That means maximum AD steps that can go 204.6.So I use only ADRESL all the time in 10bit result![]()