MicroPython Forum (Archive)

Looking at your code (not totally understanding it) it seems the amount f RAM your using is simple math. Number of samples multiplied by the size of each sample (2 bytes or 4 bytes) packed in to a bytearray. looking at it you have 3 options: 1. choose a MCU with more RAM 2. either reduce the number ...

First why don't you use the hardware timer to toggle the pin? Why are you toggling the pin with software?? Python is a not real time system. It has an interrupter and that interrupter can be doing thing in the back ground like garbage collection. Don't confuse python software call backs and C hardwa...

@dhlands Have you looked at the the Robotis dynamixel SDK for both their protocol 1.0 and 2.0 it has implementations in many programming languages. I have used their python SDK on both PC and RPi and it has all the needed low level primitive functionality but could do with a high level API wrapper f...

I'd consider an external tri-state gate. The timing of trying to switch the tri-state logic gate using another GPIO pin is near impossile to do, other have tried that from the RPi UART. I did find this circuit for converting full duplex to half duplex on an AVR reference manual. You would also have...

Depending the MCU being used, sometimes you don't need any extra hardware. I have a driver, which you can find over here: https://github.com/dhylands/bioloid3/blob/master/bioloid/stm_uart_port.py Thanks # Set HDSEL (bit 3) in CR3 - which puts the UART in half-duplex # mode. This connects Rx to Tx i...

I thinking about using Dynamixels Servos on some of my micropython projects. The Dynamixel servos are what many would call a smart servo where the servo has an MCU on it that controls the servo including all PID speed and position and torque control and a master just tells the dynamixel what it want...

The cap needs to go between EN and ground. If the voltage on the EN pin dips at all it resets the MCU so you need a small cap on the EN to fill any dips.

From above https://imgur.com/a/YWYB2AO you can see on the left board there isn't a cap on bottom left EN so it becomes unstable

Can you provide a specification reference to the encoder? I am just interested to learn more about the encoder hardware that people are using. Also, how are you using the encoder? e.g. manual turning? other? I'm experimenting with a Taiss incremental rotary encoder with 600 pulses per revolution. I...

The schematic is now in my repo - I've reorganised things, as I plan to have a play with some other coding environments as well. I enabled discussions on GitHub in case anyone wants to chat about the board there, but I'll be here and on Slack as well. Thanks having a access to a schematic always ma...

Although we call then timers whats a timer really is is a hardware counter. It can count up or down and it will count 1 step every time the input clock ticks. These timers can have input clocks in the MHz. How the timer can be used to count encoders is that 2 encoder pins go through some logic circ...