ESP32 with a capacitive sensor

[FlorianB]

Hi! I am trying to add an capacitive sensor to the ESP32, that will work through glass with 3mm thickness and an distance of 8 to 2 cm. I have bought sensors which only work on touch, i have looked into the touchRead() function but cant get a steady value increase/decrease with distance and only a real touch gets me enough difference to count it as a "touch". I have checked Arduino examples with foil where a resistor can set the sensitivity but nothing worked on my ESP32. i have spent hours looking for an example, can somebody point me to one please?

[salmanfaris]

@FlorianB Can you share the code, output window/error and details of the sensor module?

[FlorianB]

@salmanfaris I haven't found a good sensor module for this at all. I used a thing which was calles touch sensor and it returns only 1/0. Tried to use touchRead() but it is not sensitive apparently, only 40 and 1 more or less.

#define touch_pin_numer 33

const int VALUE_THRESHOLD = 30;
int TOUCH_SENSOR_VALUE;
void setup()
{
Serial.begin(115200);
delay(1000);

}
void loop(){
TOUCH_SENSOR_VALUE = touchRead(touch_pin_numer);
Serial.println(TOUCH_SENSOR_VALUE);
if(TOUCH_SENSOR_VALUE < VALUE_THRESHOLD)
{
Serial.println ("Touch ON");
}
else{
Serial.println ("Touch OFF");
}
}

should show something between 40 (current max) and 1 (current min) the closer the finger gets but it shows 40/41/39 and 1 - nothing inbetween. got this code from the web

[FlorianB]

@salmanfaris best if you could point me to an example that works as described: getting different values depending on hoe close the finger is without really touching. nothing i tried did work yet

[salmanfaris]

@FlorianB said in ESP32 with a capacitive sensor:

I haven't found a good sensor module for this at al

One of my friend used TP223 Touch button module from Ali express, and it's worked fine also @Akhil also used on of module.

another option is that you can build capacitive sensor your own with resistors.