Over 2 years ago a British nationwide electronics stored closed. I picked up so many bargains I forgot about some. This one came to mind after watching a DroneBot video about touch sensitive keypads.
The device is a numeric keypad built into a shield with stackable header already soldered on. The packaging says it’s a Maplins device but it says LinkSprite Touch Shield on the actual device. I’ve attached links to the LinkSprite an SparkFun sites below.
I cannot find a Maplin link for this bug I did find one for LinkSprite. Sadly all the links to drivers and sketches are dead. I have emailed LinkSprite but so far there has been no reply.
The packaging just says it is an MPR121 IC. There is a very small pamphlet with it that calls it an N93DG. It explains what it does and the pin connections used. But very little else
I found an almost identical item from SparkFun. I managed to get mine working in a basic manner using the information from SparkFun and Github.
There are three pins used to add extra pads. I have followed the sketch format and got these pins to send ‘&’, ‘.’ and ‘-‘ when selected. Here’s where the fun begins 😁
if I touch the “extra” pins with my finger, or something conductive, it displays what I’ve programmed it to and the rest of the pad works properly too. If I attach a wire to the pin, the wire becomes sensitive and displays what it should but now all the pads display the same thing, for example ‘&’
Does anyone have any knowledge or info on this device or any insight into how the extra pins work.
Thanks in advance.