??? 02/28/08 16:02 Read: times |
#151604 - Paranoia medicine Responding to: ???'s previous message |
So, you could put a Schmitt trigger gate of 74HC14 directly at the sensor, using a pull-up of 4k7, unless the data sheet intervenes. At microcontroller side another 74HC14 gate could act as a receiver. Now you can also place some filtering in front of receiver in order to remove noise or to protect against ESD, etc.
Even better, you could put a RS-485 transmitter directly at the sensor, using a pull-up of 4k7, unless the data sheet intervenes. At microcontroller side a RS-485 receiver would be the receiver. Now, using modern 485 chips you will have "protection against ESD" and with differential signalling you will be virtually immune to noise. Erik |