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As transducer itself is not referenced to any other voltage, You don't need diferential aplifier. You can use operational amplifier and connect one electrode of transducer to GND and the other to + input. If You use diferential amplifier connect transducer directly to amplifier inputs and also...
RS485 is half duplex line (2 wire) and RS422 is full duplex line (4 wire). On RS485 also Y-A and Z-B pins are joned together. So it depends on what You have on the other side of the communication line.
You can not transmit and receive at the sime time on half duplex lines (that is why it is...
As You can see it from circuit diagram, feedback resistor is not connected internaly to output pin. You have to connect it externaly. This gives You flexibility to wire output and sense pin separately to load and join them there. This can improve accuracy of the circuit.
Sensor should not be directly under IR lamp, it should be in the "shadow". It is like measuring outside air temperature: You do not put thermometer on direct sunlight.
It is not about the LED power, You can not beat the sun light with power. There are other things:
- Front plate between LED's should be special nonreflective black colour
- You should prevent reflection of sunlight from LED itself, basically they should be in the shade. There are several ways to...
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