TTP229 Capacitive-Sensitive Keyboard?
JonTitus
Posts: 193
in Propeller 1
Has anyone had success connecting a TTP229 capacitive-touch 4x4 keyboard to a Prop-1 chip? I have the TTP229 data sheet and have tried all clocking arrangements for the serial I/O with the chip, but never get any data. I have a logic analyzer that shows no data during the 16 pulses from the Prop-1. The TTP229 board might be useful in a middle-school class, but not unless I can get some software to work. Any help greatly appreciated. Thanks. --Jon
Comments
Try this one, works with most sticky back amazon arduino keypads, use pins 0- thru 7, If you change pins you have to modify both objects. Attach connector in the correct direction
The pad with the IC, is I2C
Try out the Basic I2C, If you don't have it already. And write one, there are a few out there you could modify
I forgot to mention the B version vs. the L version.
A good keypad / board is hard to find, and everyone needs one, or two. If anyone can get a 4x4 or 4x5 capacitive touch keypad to work Reliably and without Glitches, with over-voltage protection and ferrite beads for RF immunity, I could manufacture 100's or 1000's at a good price and sell all of them.
I have it working with the BS2, checkout my post under Basic Stamp
Thank you all for your comments and suggestions. I did get soft ware working on an Arduino and on a BBC Micro:Bit. Next up is a QuickStart board. The trick is to set the proper timing of the pulses--a delay of 10 microsec does the job--between each logic transition; that is, 0-->1 and 1-->0 on the clock signal from the computer to the keyboard. Use a delay of 3 millisec between successive bursts of 16 clock pulses so the TTP229 can reset itself. If you try to run scans faster than that you will not get good data. --Jon