pdrift86Well In all my excitement building this thing, I overlooked how many i/o I needed vs how many I have available on the teensy. I need 23 for the keyboard, 4 for the joystick, and 4 for the 2 pushbuttons. Unless I got it wrong on the 2 pushbuttons. Maybe I don't need 4. I'm not sure if i can get away with 3 if they share a pin. Either way, that's 31 pins of i/o that i need and the teensy 2.0 only has 25. I also have a teensy lc on hand but that still only has 27. I just ordered a teensy 2.0++ on amazon which should be here by Friday.
I'm not really sure on the wiring part. I have an idea and I'm looking in to it. The part I'm confused about is which pins to wire my components up to on the teensy. I think the analog joystick has to be wired up to analog pins, it has 4 pins and from what i found online they are ground, y axis, vcc, and x axis.
As far as the keyboard goes, i think any io pins should work as well as the pushbuttons.
I could use some help with the wiring up of the teensy thing lol.
Discussions
Become a Hackaday.io Member
Create an account to leave a comment. Already have an account? Log In.
I agree with what the other chaps have said - I was going to suggest using a resistor ladder, then you can have multiple buttons returning different values to one pin :)
Are you sure? yes | no
I like this idea. I already have the teensy 2.0++ with more pins but I will try that out in a future project. Right now I'm having trouble programming the teensy.
Are you sure? yes | no
Good man. It's great; I used it on an Arduino pro micro in a footswitch for a PC (for controlling start/stop/recording in a recording studio).
What issues are you finding with the teensy buddy?
Are you sure? yes | no
For some reason I couldn't reply to your last comment so I'll reply here. Well i think i flashed a bad hex file with teensy loader. Now I can't seem to reprogram it. I tried flashing the arduino blink sketch but it won't work.
Are you sure? yes | no
For some reason I couldn't reply to your last comment so I'll reply here. Well i think i flashed a bad hex file with teensy loader. Now I can't seem to reprogram it. I tried flashing the arduino blink sketch but it won't work.
Are you sure? yes | no
Hmmm... Having never played with the Teensy I'm unsure how to advise. I will certanily see if i can find some info on how to save it if i can!
Are you sure? yes | no
forgiveness
Are you sure? yes | no
I remember one year ago i had the same problem, i found that i could add buttons to 1 wire, you only have to add a different value resistor to each button (From 5V), if you read the voltage you know what button is high. i tried it with 10 button and it works perfectly with an Arduino, only connecting 2 wires (the other wire is ground with other resistor).
I think that teensy has analog read too and you can use it to the keyboard and pushbuttons, but the joystick needs an independent wire.
Are you sure? yes | no
Wow, I did not know you could do that! I will look into it. Thanks!
Are you sure? yes | no
I think you can get away with three pins for the two pushbuttons - 2 I/O pins on the Teensy, and one GND connection. Connect one pin from each button to an I/O pin, and the other button pin to a shared GND wire.
Then, just enable the internal pull-ups on the IO pins. That way the pin will be high when the button is not pushed, and low shen pushed.
https://forum.pjrc.com/threads/7531-Internal-pull-up-and-pull-down-resistors-on-teensy-3 (same for Teensy 2)
Are you sure? yes | no
Thanks, I will look into it.
Are you sure? yes | no