On the Arduino side I have 3 floats comming in. When reading in the floats I send the value received back to the python console that sent them for a sanity check. They are then constrained & then I use the ramp library to interpolate a trajectory to the position given by the 3 floats. After the mo…

[image] DrBwts: while (Serial.available()) { that's not a great way to receive the payload, you are likely to empty the incoming buffer and exit the while loop because some bytes are still coming through. and then you exit this while loop and attempt to do something with "half baked" roll…

Thanks, that has cleared up the syncing on the Arduino side. Unfortunately the Python side is missing the "x" getting sent so just hangs waiting. Works fine if I take out the blocking code thats waiting on the acknowledge from the Arduino.

Full Arduino code, #include "neck_platform.h" #include <Ramp.h> #include <Wire.h> #include <Adafruit_PWMServoDriver.h> #define DURATION 4000 // in ms #define SERVOMAX 2500 #define SERVOMID 1500 #define SERVOMIN 500 rampFloat x_rot; rampFloat y_rot; rampFloat z_rot; uint8_t b…

On the python side, do you see those prints ? [image] DrBwts: if len(received) == 3: print(f"Yaw: {received[0]:.2f}, Pitch: {received[1]:.2f}, Roll: {received[2]:.2f}") print(" ") print("Waiting for move to complete...") In [image] DrBwts: while(!(x_ro…

The Python code hangs after printing “Waiting on move to complete…” `.isFinished()` …returns a bool so didn’t think that bitwise would be a issue in C++ The ramp objects are all interpolated over the same time duration. As the step size’s for each are in general different then, one of them may fi…

But do you see the other print confirming the 3 values ? [image] DrBwts: …returns a bool so didn’t think that bitwise would be a issue in C++ In that case it will work indeed as the implicit promotion to int 0 and 1 will make the bitwise maths work. Ok as well then if stopping when any on…

Yes the 3 values are printed correctly.

Are you sure they are correct ? Could you print what you send and what you get back ? There is a conflict somewhere but your logic seems fine My experience has been (as I said in my tutorial) that it’s more stable if you have a task dedicated to handling the serial line and a task handling the ass…

Serial comms issue

Projects Programming

J-M-L November 24, 2025, 6:42pm 5

post your full new code

BTW - I've written a small tutorial on interfacing with Python. See Two ways communication between Python3 and Arduino

Topic		Replies	Views
Control loop Issues Python Arduino communication General Guidance	10	179	October 24, 2025
Unusual characters returned to Python via serial Programming	22	458	September 10, 2025
Two ways communication between Python3 and Arduino Tutorials	14	6945	October 4, 2024
pySerialTransfer Two Way Communication Issues Programming	16	383	July 16, 2024
Arduino Nano to Python Serial Communication Missing Data Programming	13	3004	August 5, 2020

Serial comms issue

Related topics