Myoware 2.0 Wireless Shield not reading data

Other
1

I recently got a Myo Air 2.0 wireless shield kit ..

it contains :
1x Myoware 2.0 sensor

1x wireless shield
1 x Esp 32 WROOM 32E

1x Myoware cable and a bunch of wires

I connected the Myoware 2.0 with the wireless shield and then I connected the ESP32 WROOM with my PC using type C..

1st problem: if i connect it wirelessly, the serial plotter does not give me any spikes .. even though it can still detect the ESP32..
2nd problem: if i connect the type C directly to the wireless shield thats connected to the Sesnor i get spikes, but i have to hold down the sensor tighly against my muscle to get any spikes at all.. if i release the pressure then nothing shows.. i tried with fresh electrodes on different muscles..all same results..

Uploaded the screenshots of plotter via wireless connection

WhatsApp Image 2026-02-16 at 8.35.34 PM
WhatsApp Image 2026-02-16 at 8.35.34 PM1200×1600 170 KB

2

void setup() {
Serial.begin(115200);
delay(200);
Serial.println(“ADC debug start”);
}

void loop() {
int pENV = 34;
int pRAW = 35;
int pREF = 32;
int pRECT = 33;

int vENV = analogRead(pENV);
int vRAW = analogRead(pRAW);
int vREF = analogRead(pREF);
int vRECT = analogRead(pRECT);

float fENV = vENV / 4095.0 * 3.3;
float fRAW = vRAW / 4095.0 * 3.3;
float fREF = vREF / 4095.0 * 3.3;
float fRECT = vRECT / 4095.0 * 3.3;

Serial.print(“ENV:”); Serial.print(vENV); Serial.print(" ("); Serial.print(fENV,3); Serial.print(“V) “);
Serial.print(“RAW:”); Serial.print(vRAW); Serial.print(” (”); Serial.print(fRAW,3); Serial.print(“V) “);
Serial.print(“REF:”); Serial.print(vREF); Serial.print(” (”); Serial.print(fREF,3); Serial.print(“V) “);
Serial.print(“RECT:”); Serial.println(vRECT); Serial.print(” (”); Serial.print(fRECT,3); Serial.println(“V)”);

delay(250);
}

this is the code i am uploading.. this code gives spike for wired connection.. but not for wireless.. also i have to press down really hard to get any spikes ..thats not going to work for my project

3

You might need to hit the reset one esp32 and wait for them to pair…or try starting them in opposite order?

As for the pressure thing, based on the photo I’m guessing there’s a bit too much hair in the way…you can try shaving an area, although I’d note that it should be a few cm more proximal to become more centered on the forearm’s muscle belly

4

I tried resetting in both other still not working .. Can you please give me the sender esp32 and receiver esp32 code for Wireless configuration?

5

It’s example3, see Getting Started with the MyoWare® 2.0 Muscle Sensor Ecosystem - SparkFun Learn