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Option 2: ESP32

danger

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I've had two separate electronics implementations:

Pins used​

You need to attach each flex sensor to an ADC pin, by using a voltage divider.

Because of Wi-Fi I've had to use the ADC pins 36, 39, and 34:

adcAttachPin(36);
adcAttachPin(39);
adcAttachPin(34);

Libraries​

This uses the WiFi capabilities of the ESP32.

const char * ssid = "############MyWiFiNetworkSSID############";
const char * password = "############MyWiFiNetworkPassword############";

void setup()
{
// ...
    WiFi.mode(WIFI_STA);

    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(10);
    }
    if (WiFi.waitForConnectResult() != WL_CONNECTED) {
        while(1) {
            delay(1000);
        }
    }

OSC​

In platformio.ini, I've added the ArduinoOSC lib.

[env]
lib_deps =
    hideakitai/ArduinoOSC@^0.3.29

This lets the ESP32 communicate directly with VRChat through the default port 9000.

#include "ArduinoOSCWiFi.h"
#include "WiFi.h"

OscWiFiClient  client;
// ...
    client.send("192.168.1.99", 9000, "/avatar/parameters/Toe_1st_Down", ioAcomp);
    client.send("192.168.1.99", 9000, "/avatar/parameters/Toe_2nd_Down", ioBcomp);
    client.send("192.168.1.99", 9000, "/avatar/parameters/Toe_5th_Splay", ioCcomp);