UART - Common ground
#1
Posted 21 January 2012 - 04:47 PM
#2
Posted 21 January 2012 - 11:03 PM
#3
Posted 09 August 2012 - 03:28 AM
Sorry for refloating this thread... I've a similar (but inverse) case.As long as the device uses TTL levels(~0 and ~5V) you are fine since the uart pins on the netduino are 5V tolerant and that resistor is not required
I need to send TX commands from my N+ to a device's RX that only supports TTL input at 5v. Having in mind that N+ only delivers 3.3v on TX, will I need to boost TX voltage up to 5v? How?
Here's the device's specs: Pololu Maestro Servo Controller.
The RX line is used to receive non-inverted TTL (0–5 V) serial bytes, such as those from microcontroller UARTs. These bytes can either be serial commands for the Maestro, arbitrary bytes to send back to the computer via the USB connection, or both. For more information about the Maestro’s serial interface, see Section 5.a. Note that the Maestro will probably be able to receive 3.3V TTL serial bytes, but it is not guaranteed to read 3.3V as high on the RX pin, so you should boost 3.3V TTL serial signals to above 4V if you want to ensure reliable operation.
I'll really appreciate your thoughts about this.
Thanks!!!
"Ver como el tiempo pasa a través de tus pacientes ojos no tiene sentido. Ve y hazlo..."
#4
Posted 09 August 2012 - 05:52 AM
#5
Posted 09 August 2012 - 11:34 AM
The MacGyver-way sounds pretty good to me at least for starting point.
I also did my research and I've found a Logic Level Converter in SparkFun that seems to meet my needs.
Thank you very much for your prompt reply!
Nico.
"Ver como el tiempo pasa a través de tus pacientes ojos no tiene sentido. Ve y hazlo..."
#6
Posted 09 August 2012 - 12:38 PM
- Nico likes this
#7
Posted 10 August 2012 - 12:07 PM
"Ver como el tiempo pasa a través de tus pacientes ojos no tiene sentido. Ve y hazlo..."
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