I am just about to start a PICAXE solar (heating) controller for water / pumps.
This is just a query on the temerature sensing.
Assuming:
A) The temp sensor will be encapsulated.
B) Any maths for temp conversion is sorted.
C) Everything is sorted (hopefully).
For cheapness vs longevity and trust/reliability, would you go for a DS18xx or Thermistor?
I only ask this as Rapid sell some neat pipe-clip-on thermistors.
PS. Has anyone come across reasonably priced flow sensors? Paddle or turbine magnetic pref. I'e been hunting high and low and can only find sutiable jobbies in excess of £80.
Note: internal optical type not really suitable as the water will have anti-corrosion (e.g. Fernox) and anti-freeze which tends to be a bit opaque.
[Needs to be connectable to standard copper 'central heating' pipe with/without adaptors and have a pulse o/p]
PPS. I'm in UK.
PPPS. Please don't spend ages searching, it was just if anyone knows of a source from memory. Just a casual enquiry.
This is just a query on the temerature sensing.
Assuming:
A) The temp sensor will be encapsulated.
B) Any maths for temp conversion is sorted.
C) Everything is sorted (hopefully).
For cheapness vs longevity and trust/reliability, would you go for a DS18xx or Thermistor?
I only ask this as Rapid sell some neat pipe-clip-on thermistors.
PS. Has anyone come across reasonably priced flow sensors? Paddle or turbine magnetic pref. I'e been hunting high and low and can only find sutiable jobbies in excess of £80.
Note: internal optical type not really suitable as the water will have anti-corrosion (e.g. Fernox) and anti-freeze which tends to be a bit opaque.
[Needs to be connectable to standard copper 'central heating' pipe with/without adaptors and have a pulse o/p]
PPS. I'm in UK.
PPPS. Please don't spend ages searching, it was just if anyone knows of a source from memory. Just a casual enquiry.