rda
Newbie level 6
Re: humidity sensor
Hi friends,
i have to do a small project to measure the humidity. using the HS1101 which have this characteristics at 1% ===>C=177pf
99%====>C=183pf
my question is how to transform the variation of the capacitance to variation of tension.
sorry for my english.
Added after 10 minutes:
i try this short simulation with isis pro and i obtain this.
1- astable which generate the rectangular signal.
2-monostable to modulate the width of the impulsion.
3-low pass filter to extract the DC tension.
for C=177pf ==>V=2.17 volts
and C=183pf==>V=2.2 volts
the variation is too short!!! how can i increase it
Hi friends,
i have to do a small project to measure the humidity. using the HS1101 which have this characteristics at 1% ===>C=177pf
99%====>C=183pf
my question is how to transform the variation of the capacitance to variation of tension.
sorry for my english.
Added after 10 minutes:
i try this short simulation with isis pro and i obtain this.
1- astable which generate the rectangular signal.
2-monostable to modulate the width of the impulsion.
3-low pass filter to extract the DC tension.
for C=177pf ==>V=2.17 volts
and C=183pf==>V=2.2 volts
the variation is too short!!! how can i increase it