Jetson Nano 2GB GPIO NO 3.3V output but 1.8V

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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1

I´m trying to control some DC motor drivers using the logic pins with the Jetson Nano 2GB, but the output Voltage is 1.5V-1.8V and does not work for my motor driver. How can this be fix?

3

hello jonadelsol,

are you working with 40-pin Header?
please refer to Jetson Nano 2GB Developer Kit User Guide, may I know which pin you’re used,
thanks

1 Like
4

Thanks for answered
yes, Im using the 40-pin Header

yes I have use multiple pins I try with
GPIO.BOARD pin 33 and 32 as PWM, same results of 1.5v-1.8v and comun gpio pins as 29, 15, 12 and as well, same results 1.5v-1.8v as True/Flase values

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There are some requests on the load of 40-pin head pins, please refer to the docs in DLC: https://developer.nvidia.com/jetson-nano-developer-kit-40-pin-expansion-header-gpio-usage-considerations-applications-note

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thanks for this document, I´ll read it
by the way I hada solution, it was to use a motor driver by the I2C port, but now I need to use servos so I check the 40 pinheader and found that there are 2 I2C ports the I2C0 and I2C1 but I havent found a way to use both of them at the same time, there is any way to do it?

9

hello jonadelsol,

there’s i2c utility to send commands via i2c bus.
for example, $ i2cset [-f] [-y] [-m MASK] [-r] I2CBUS CHIP-ADDRESS DATA-ADDRESS [VALUE] ... [MODE]

in addition,
may I know what’s the actual use-case to use these I2C ports at the same time?
thanks

1 Like
11

thanks for reply, I didn’t notice this response sorry
the fact is that I’m building a rover and I´m using a Featherwing i2c DC motor controller for the 4 dc motors
and I want to use an Waveshare i2c servo hat to control the servo in the camera, so I can point to any direction without moving the wheels
Here are some pictures of my setup
so that is the reason why I would like to use both of the i2c ports at the same time.

featherwing.jpeg
featherwing.jpeg1280×960 108 KB

servohat.jpeg
servohat.jpeg960×1280 69.2 KB

servocameraarm.jpeg
servocameraarm.jpeg960×1280 85.7 KB

Featherwing problem with pygame.mp4 (6.19 MB)

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hello jonadelsol,

what’s the timing precision you’re looking for at the same time?
it should be doable by using i2c_mux for your two i2c devices, since this is sharing the same i2c bus.
for example,

        cam_i2cmux {
                compatible = "i2c-mux-gpio";
                mux-gpios = <&gpio CAM_I2C_MUX GPIO_ACTIVE_HIGH>;
                i2c-parent = <&i2c7>;

                i2c@0 {};
                i2c@1 {};