mongoose-os-libs/esp32-touchpad

JS bindings for ESP32 touch pad sensor

JS bindings for ESP32 touch pad sensor

Overview

This library provides JavaScript bindings for the ESP32 touch pad sensor. The JS API largely mirrors the C API.

Examples

Polling the sensor manually

load('api_esp32_touchpad.js');

// Touch sensors are numbered from 0 to 9.
// For convenience, TouchPad.GPIO map translates from GPIO number to sensor number.
let ts = TouchPad.GPIO[15];

TouchPad.init();
TouchPad.setVoltage(TouchPad.HVOLT_2V4, TouchPad.LVOLT_0V8, TouchPad.HVOLT_ATTEN_1V5);
TouchPad.config(ts, 0);
Timer.set(1000 /* 1 sec */, Timer.REPEAT, function() {
  let tv = TouchPad.read(ts);
  print('Sensor', ts, 'value', tv);
}, null);

Using interrupts

load('api_esp32_touchpad.js');

// Touch sensors are numbered from 0 to 9.
// For convenience, TouchPad.GPIO map translates from GPIO number to sensor number.
let ts = TouchPad.GPIO[15];

TouchPad.init();
TouchPad.filterStart(10);
TouchPad.setMeasTime(0x1000, 0xffff);
TouchPad.setVoltage(TouchPad.HVOLT_2V4, TouchPad.LVOLT_0V8, TouchPad.HVOLT_ATTEN_1V5);
TouchPad.config(ts, 0);
Sys.usleep(100000); // wait a bit for initial filtering.
let noTouchVal = TouchPad.readFiltered(ts);
let touchThresh = noTouchVal * 2 / 3;
print('Sensor', ts, 'noTouchVal', noTouchVal, 'touchThresh', touchThresh);
TouchPad.setThresh(ts, touchThresh);
TouchPad.isrRegister(function(st) {
  // st is a bitmap with 1 bit per sensor.
  let val = TouchPad.readFiltered(ts);
  print('Status:', st, 'Value:', val);
}, null);
TouchPad.intrEnable();