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GREAT! it works. because of 2 pull-ups of 10k and I didn't knew it. exactly by 4.09 volts comes 4095 in on exel. all the 8 AD in works great. i'm very pleased with it. thank you very much,Stefan for the pull-ups idees. and thanks to H.J.W. for the good explenation , and making the program. Greetings, Hans > Hello Hans, > Stefan Süßmann is absolutely correct, I missed it. > The SDA and SCL lines must have pull-ups otherwise the I2C Bus will fail. > Because the I2C Bus is a bidirectional bus, the master and slaves only pull the bus line(s) to GND for a “0” and lets go of the bus line(s) for a “1”. > > H.J.W. > > > > Thanks Stefan > > > > The connection is a sensor 4 - 20 mA > > so I have 1 to 5 volt or 1 to 4,095 volt 4095 > > I haven't pullups on the SDA and SCL > > is that necessary ?? > > > > Hans > > > > > > > Hi, > > > > > > the print of the drawing is not very clear. > > > > > > What i see is a missing 1K in the SDA line and for me it looks like all channels are on 16V. > > > Are ther pullups on SDA ans SCL? > > > > > > Bye > > > > > > Stefan |
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