Trouble with Myoware sensor 2.0

Robotics
1

Hello,

I have been trying to get to my myoware 2.0 sensor to receive muscle inputs but I am unable to do so. After connecting my LED shield to the Myoware 2.0 sensor and turning it on, the LED shield lights up. When I place the myoware sensor and the led shield stack on my muscle, the LED bar instantly drops and turns off.

Things I have tried so far:

  1. Placing the LEDshield/myoware 2.0 sensor stack across a variety of different arm, bicep and leg locations.

  2. Performing the continuity test on the Cable Shield and TRS Cables (They work)

When I tried it on the Myoware 2.0 sensor, there was a high resistance value between the “MID” and “END” (1526), I’m not sure if that’s what is supposed to happen

I connected the board correctly to the arduino and to my laptop to get the analog readings. The serial monitors gave me a stream of “0”.

Is there a manufacturing issue with the myoware 2.0 sensor? Can you please help me debug this issue?

https://drive.google.com/file/d/1WMtkwp … sp=sharing

2

Hi,

A technical support representative brought this case up to my attention.

Hmm, it looks like you are placing the sensor correctly on the your forearm. The LED shield should react to your forearm and you are not connected to a power outlet, so I find it odd with your readings. I will need a little bit more information to understand what is going on.

I am not sure what you mean by high resistance value of 1546. Are you using the [MyoWare 2.0 Cable Shield with the [TRS to electrode cable and reading it with your Arduino connected to a laptop that is not plugged into the power outlet?

Did you increase or decrease the trim pot at all? If it turned all the way down, this might be why you are seeing the values as 0 or not lighting up with through the LED shield. The default gain should be sufficient for most applications. However, users can adjust the trim pot for the ENV’s output to the desired gain setting using a screwdriver.

What specific Arduino were you using and what analog pin are you connected to? Are you connecting the muscle sensor to your Arduino with the MyoWare 2.0 Link Shield and the Arduino Shield? If not, did you use IC hooks or soldered any wire to the sensor?](Sensor Cable - Electrode Pads (3 connector) - CAB-12970 - SparkFun Electronics)](MyoWare 2.0 Cable Shield - DEV-18386 - SparkFun Electronics)

3

Hey,

Thanks for replying. Yes, I made sure I did not connect my laptop to a charger while working on my myoware sensor.

Regarding the trim pot, I tried the default, high and low positions to obtain results. I also tried to position the trimpot at different positions but was still unable to get the sensor to work. I connected my myoware sensor to my LED shield to see the results. Either my LED shield would completely light up or it would light up for a couple of milliseconds and turn off.

I used an Arduino Uno, with an Arduino Shield and connected my Myoware Sensor to the A0 port. I connected it to my cable shield to get muscle signals. I did not solder any wires to my myoware. It worked the first time I took out of the box but it stopped the second I tried to use it.

Still no results. Is there something else I might be doing wrong?

Thanks for your time.

4

hello_World:
Hey,

Thanks for replying. Yes, I made sure I did not connect my laptop to a charger while working on my myoware sensor.

Regarding the trim pot, I tried the default, high and low positions to obtain results. I also tried to position the trimpot at different positions but was still unable to get the sensor to work. I connected my myoware sensor to my LED shield to see the results. Either my LED shield would completely light up or it would light up for a couple of milliseconds and turn off.

I used an Arduino Uno, with an Arduino Shield and connected my Myoware Sensor to the A0 port. I connected it to my cable shield to get muscle signals. I did not solder any wires to my myoware. It worked the first time I took out of the box but it stopped the second I tried to use it.

Still no results. Is there something else I might be doing wrong?

Thanks for your time.

By cable shield, are you referring to the [Link Shield? If that is the case, are using a TRS-to-TRS cable?

The Arduino Uno should work with the MyoWare Arduino Shield and it sounds like you tried adjusting the gain. From your explanation, it sounds like it might have initially worked out of the box but I’m not sure what happened after that time that caused it to not work for your application.

If you have not already, maybe you can try [contacting technical support to see if they can send you a replacement to see if you get better results.](Return Policy - SparkFun Electronics)](https://learn.sparkfun.com/tutorials/getting-started-with-the-myoware-20-muscle-sensor-ecosystem/-myoware-20-link-shield)