Hi Guys…
I want to connect my Jetson Nano with a rotary encoder that has a voltage of 5V. I have an E40S6-5000-3-N-5 encoder model by Autonics. I have confusion to connect the encoder to Jetson Nano because I am afraid that the wrong connection will cause damage to my Jetson Nano. Can someone show me how to make the connection…
Please help me guys…
Hope someone has such experience can be shared. For custom design and carrier board interface, please refer to the Nano design guide and Nano carrier board spec docs in DLC.
I definitely can’t answer, but I did notice some spec sheet items of interest.
The input itself of 5V could possibly come from the Nano’s 5V rail on the header. It just depends.
The output of this is open collector bipolar transistor, NPN. That means the output does not have a predetermined voltage. The output could be a pull up resistor to 3.3V as an example, and much of the Nano’s I/O is 3.3V. However, depending on the pull up, the current draw on “0” will go up more or less, and this might change (A) the current draw to become excessive (or not), and (B) alter the quality of regulation to the Nano. You could avoid most issues by supplying the 5V to the encoder via Jetson, but supplying the I/O side to the open collector via a separate regulated 3.3V supply. You could in fact at least test powering the separate 3.3V regulator via the 5V of the Jetson, and if it is unstable, switch to a second isolated power source (the same regulator would be useful, but you’d feed it from something independent of the Jetson). I doubt the 5V side needs a separate regulator since it is open collector, but you’d have to test.
As for the three phases, maybe GPIO could be used (which is 3.3V). The problem there is that GPIO is slow at response, so if this encoder is turned at any significant rate, then it would probably start dropping bits. I can’t say how to get around that, but if it is turning slowly, then perhaps you don’t have to get around it. There might be alternatives such as an encoder-to-i2c adapter.
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