the button matrix
433MHz MQTT remote
with the oh so popular ESP12 of course!
Printed a case that fits a 5x7cm2 eBay el-cheapo protoboard, slapped on some switches, a 433MHz transmitter and one of my ESP12 breakout boards and called it a day.
the button matrix
the button matrix
I have no idea what I did, but GPIO16 behaves weird. There is a transistor that allows me to toggle the cols with one pin. PIN 16 "OFF" weirdly jumps between HIGH and LOW, but I neglect that because you can achieve the desired state by just pressing the button longer.
Like with many of my projects there is no backside yet, but this is so much better than having the pure PCB flying around.
An external antenna could be handy, at least a 17cm wire or so.
I have no idea what I did, but GPIO16 behaves weird. There is a transistor that allows me to toggle the cols with one pin. PIN 16 "OFF" weirdly jumps between HIGH and LOW, but I neglect that because you can achieve the desired state by just pressing the button longer.
Like with many of my projects there is no backside yet, but this is so much better than having the pure PCB flying around.
An external antenna could be handy, at least a 17cm wire or so.