DS2423 going crazy
Posted: Fri Sep 08, 2006 12:22 pm
Robert,
The 741 opamp is a very good amplifier that is best driven by a dual powersupply, +5, 0, -5. However a single supply 0, +5 is also possible. But it depends on the use. Used with a single supply in some cases you have to take precautions to get the output nice in the middle for AC use and need to use a capacitor to stop the DC current flow through the output. But that is not the case here, we use this amplifier for DC switching and amplifying.
I use the LM324 because this opamp is designed for a single powersupply and can switch from 0 to almost 5V when driven by a single 5V supply. There are 4 opamps in this case so when you need a buffer amplifier just use 'm.
Still the signals you get from the 741 looks very good, so maybe it is not as worse as it looks. If you made a serious mistake the 741 would have explode [:D]
Draw the schema again and publish it.
What do you use as busmaster for the DS2423? Check if this busmaster has already the pull-up resitor on the 1-wire bus line. This resistor 1k5 .. 5k is important. The devices which pull down the line must get enough sink current otherwise you get strange results.
Regards,
Marcel
The 741 opamp is a very good amplifier that is best driven by a dual powersupply, +5, 0, -5. However a single supply 0, +5 is also possible. But it depends on the use. Used with a single supply in some cases you have to take precautions to get the output nice in the middle for AC use and need to use a capacitor to stop the DC current flow through the output. But that is not the case here, we use this amplifier for DC switching and amplifying.
I use the LM324 because this opamp is designed for a single powersupply and can switch from 0 to almost 5V when driven by a single 5V supply. There are 4 opamps in this case so when you need a buffer amplifier just use 'm.
Still the signals you get from the 741 looks very good, so maybe it is not as worse as it looks. If you made a serious mistake the 741 would have explode [:D]
Draw the schema again and publish it.
What do you use as busmaster for the DS2423? Check if this busmaster has already the pull-up resitor on the 1-wire bus line. This resistor 1k5 .. 5k is important. The devices which pull down the line must get enough sink current otherwise you get strange results.
Regards,
Marcel