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If you need guinea pigs I will gladly offer to help. No code abilities and very much a beginner in electronics but I can offer encouragement. I have had hearing aids for years and also need more than freq shift. They have come a long way but even the new models struggle with various...

Thank you very much. Paul

Take a look at the code that I used for my EMG keyboard. It may help you with the code when you have to hit multiple buttons at a time to get different outputs. http://forum.pjrc.com/threads/22024-Assistive-device-chord-EMG-input-for-virtual-keyboard Paul

Take a look at the "projects" section of this site and you will find similar devices. The good thing about the teensy is that it is recognized as an HID. I did a chord HID keyboard using EMG as an input. Search under EMG and you will find some of the challenges in timing when you try to get...

I think that I should look at one approach at a time. How can I "tap" into the throttle position sensor without affecting the voltage sent to the ecu? I am able to log the TPS voltage through the OBD-II port and my tuning/logging software to check if there is a voltage difference. Thank...

Doh! Sometimes, okay most of the time I am an idiot. You are correct, this is not a drive-by-wire. Time for some warm milk then bed. Thanks again for your comments! Paul

This car does not have an ETC. It is a "drive by wire" throttle body, there is no motor or gears involved. There is no input from the ecu to control the throttle, it is linkage and wire. The throttle position sensor is a pot. I understand your concerns and I appreciate your voicing them. I...

Thank you Paul! Just to clarify, can I use the teensy2 to read directly from the OBD-II port or do I need additional hardware? I will use a basic OBD connector to physically connect the teensy to the port. I do have spare ecus that I will use while testing. Paul

Perhaps I should look at getting the readings from the OBD-II port. There are libraries in arduino for reading various OBD-II parameters and one which is included is the throttle position. http://arduinodev.com/hardware/obd-kit/ The teensy 2 is small enough to embed into an OBD connector. The...

Yes, that is my biggest concern. RPM is sent to the ecu in a similar manner so the concern with unintentional alteration of the sensor's signal applies to practically all of the OBD-II readings. It is the rate of change and the amount of change to the throttle opening that is used as an input...

I want to be able to read the analog signal 0-5v, from a throttle position sensor (basically a pot). The signal is used by the car's ecu so the method I use to get the signal to the teensy 2 cannot influence the signal as it is seen by the ecu. The teensy 2 will be powered by another 5v supply...

I have read through most of the posts relating to the comparator function but I do not believe this is the direction I should go in. I am using analog inputs EMG sensor boards as input for a virtual keyboard. The threshold can be adjusted to help with coordination. if (sv0 > 250) { key...

I managed to merge the mouse control as well as the text generating codes together but I overlooked the need for a few changes. While trying it with the EMG sensors I noticed that I really had to flex in order for the interrupt to change the character maps. At the moment the interrupt is...

Well, with the help of my tutor I now have the mouse control. I am still tossing around ideas that will wok best but for now this is what I have (using Paul's timing method). Left thumb flex then mouse moves left. Flex again mouse stops. Flex baby finger and mouse moves right. Flex again...

Okay, I started learning about arrays two days ago and the gears are slowly starting to turn. Would an array be able to let me do the following: if sv0 state changes then move mouse left if sv1 state changes then move mouse right if sv2 state changes then move mouse up if sv3 state changes...

Thanks for the encouragement Paul, I am having a blast learning how to do this. Quick question, is there a way to use something like a "mousemap" function that would work the same way the "keymap" funtion? I can see how I can modify an arduino mouse sketch designed for digital buttons but I...

Sensors are in,board is finished, and code has been modified to include three character sets plus mouse control (not included for testing) and toggling through character sets. I am going to look at using conductive fabric sewn into a cut down glove rather than the sticky electrodes to make the...

Just a quick update. Figured out how to toggle different character sets as well as a mouse function. Sensors arrived so I have to turn my attention to putting together a suite of assessment tools to see what type of signals I can get from my volunteer. I have used the oscilloscope program in...

Well, after struggling to implement Paul's approach I went and got a tutor to help me out. My tutor took a slightly different approach so the next session I will ask him to help me understand and implement Paul's approach. In the mean time the following code works. I used variable resistors...

Thank you Paul, When I get home from work I will start with two inputs and gradually increase to 5. I truly appreciate your explanation of the process as I know what needs to be done, just not how to do it. With your clear explanations I can begin to understand what the functions are doing...

Brilliant!!! That was what I was looking for. Thank you very much. I managed to increase the inputs to 5 and to generate a different letter for each input. Wow, that was the most progress that I have made in a long time. Now for the challenging part. I need to change the output from...

The following code gave the "a" as a continual output. I changed to serial print in case I made a mess of things (which is quite often!). I added the delay to slow things down. Teensy++2 Is it possible to do the following? If threshold is under 250 then do nothing. If over 250 then...

Thank you Paul, I will play around with that and see how it goes. Take care! Paul

Thank you for your help Michael. I understand that the way that I am doing this may not be the best but for me it is the easiest way for me to visualize what is going on as I am completely ignorant about the various function statements that are available. I plugged in a "delay(500)" at the...

Purpose (started 30 years ago!) was to design a device that would allow people with amputations, arthritis,etc. to use EMG as an input for a virtual keyboard. Just over a year ago I learned about arduino and then discovered the teensy. First step was to use a teensy++2 along with 5 buttons...