There isn't much spare room in this project, so any space saving tricks comes in handy. These holes will now host the signal out and ground pins of the touch board, respectively. Inspect the cut with a magnifying glass to make sure there is no residual metal. Using a hobby knife or other sharp blade, cut the reset trace on the back of the main board and the trace to pin 13 on the front. Unfortunately, the signal and ground pins don't, so we will have to make some modifications. The voltage input of the button lines up perfectly with the 3.3v output of the main board. In our case, we are going to leave these bridges open, which will make the button act as a momentary switch. Creating a solder bridge across the A and/or B pads changes if the button toggles and if the output is high or low when active.
Removing the resistor to the LED disables it, reducing the power consumption. The output pin on the button goes high and a LED on the back lights up whenever your finger gets within a few mm of the touch surface. The maximum standby current of the touch IC is only 7♚, so not much power is wasted adding this button.
#Vsm cryptocurrency ticker software#
They usually come in packs of 10 for around 3 bucks shipped! I know that the ESP32 has built-in touch sensing capability, but using these boards makes things more simple and eliminates software configuration errors. These are neat little touch buttons that are easy to add to any project.
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