Esp32 Simple Osc Receiver

Mon, 09 Nov 2020 16:29:19 +0100

Lately I have started experimenting with the very cheap and powerful ESP32 microcontrollers.

Today I made a simple example of a firmware which receives OSC from a computer and then blinks the on-board LED according to the incoming message and I packaged it all as an easy to clone/copy/use platformio project (mostly for myself).

The firmware uses CNMAT’s OSC library:

#include "Arduino.h"
#include "WiFi.h"
#include <OSCMessage.h>

WiFiUDP Udp; // A UDP instance to let us send and receive packets over UDP
int LED_BUILTIN = 2;

// Options
int update_rate = 16;

// Network settings
char ssid[] = "wifiname"; // your network SSID (name)
char pass[] = "wifipassword"; // your network password
unsigned int localPort = 8888; // local port to listen for OSC packets

void setup() {
 pinMode(LED_BUILTIN, OUTPUT);

 /* setup wifi */
 WiFi.begin(ssid, pass);
 while (WiFi.status() != WL_CONNECTED) {
 delay(500);
 }

 Udp.begin(localPort);
}

void ledtoggle(OSCMessage &msg) {
 switch (msg.getInt(0)) {
 case 0:
 digitalWrite(LED_BUILTIN, LOW);
 break;
 case 1:
 digitalWrite(LED_BUILTIN, HIGH);
 break;
 }
}

void receiveMessage() {
 OSCMessage inmsg;
 int size = Udp.parsePacket();

 if (size > 0) {
 while (size--) {
 inmsg.fill(Udp.read());
 }
 if (!inmsg.hasError()) {
 inmsg.dispatch("/led", ledtoggle);
 } 
 //else { auto error = inmsg.getError(); }
 }
}

void loop() {
 receiveMessage();
 delay(update_rate);
}

And here is some SuperCollider code to play around with:

Raspberry Pi 4: Simple Button to OSC example in Rust

Thu, 11 Jun 2020 16:49:29 +0200

Today I did a small experiment with my Raspberry Pi 4: I wanted to poll the GPIO data pins and use data from them in SuperCollider. This is best done by polling the pins in a separate program and then sending that data to SuperCollider via OSC.

I have done this in Python before but I much prefer doing this kind of thing in Rust since the latter is fast and safe (and just generally: I love Rust!).

Osc on Mads Kjeldgaard — Composer and Sound Artist

Esp32 Simple Osc Receiver

Raspberry Pi 4: Simple Button to OSC example in Rust