Exception 29 on ESP8266-12e

[paulstoffregen]

Exception 29 on ESP8266-12e

[PaulStoffregen]

I can't troubleshoot ESP8266 problems. But if someone does solve this, please submit the fix as a pull request. As long as it only changes the ESP8266-specific code, I'll be happy to merge the fix.

[develpr]

@s00500 if you don't mind me asking, how did you have your circuit setup for this? Are you using the ADC pin?

[s00500]

No, I havn't been using D5 and D6 (GPIO 12 and 14)

[androcioli]

@s00500 Hi I'm getting an Exception (29) on the esp8266 too. Did you resolve this problem with CapacitiveSensor or you have found another code for the ESP8266?

[s00500]

@androcioli no i've been using way simpler code to do this.

[androcioli]

@s00500 Do you can making the code available you're using?

[BorisWild]

Open CapacitiveSensor.h... find lines 95 - 104... and refresh them with that:
#elif defined(ARDUINO_ARCH_ESP8266)
#define PIN_TO_BASEREG(pin) ((volatile uint32_t*) GPO)
#define PIN_TO_BITMASK(pin) (1 << pin)
#define IO_REG_TYPE uint32_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) ((GPI & (mask)) ? 1 : 0) //GPIO_IN_ADDRESS
#define DIRECT_MODE_INPUT(base, mask) (GPE &= ~(mask)) //GPIO_ENABLE_W1TC_ADDRESS
#define DIRECT_MODE_OUTPUT(base, mask) (GPE |= (mask)) //GPIO_ENABLE_W1TS_ADDRESS
#define DIRECT_WRITE_LOW(base, mask) (GPOC = (mask)) //GPIO_OUT_W1TC_ADDRESS
#define DIRECT_WRITE_HIGH(base, mask) (GPOS = (mask)) //GPIO_OUT_W1TS_ADDRESS

[PaulStoffregen]

fixed by 83ee030

[Maxr1998]

@BorisWild @PaulStoffregen I somehow can't get this to work for me with my ESP8266-12E, it always throws a timeout (-2). This is my code:

#include <CapacitiveSensor.h>

CapacitiveSensor csense = CapacitiveSensor(12, 14);

void setup() { 
  Serial.begin(115200);
}

void loop() {
  Serial.println(csense.capacitiveSensor(30));
}

I'm using the latest library version cloned from GitHub.

I have a 10MOhm resistor wired up to pin 12, and a 1KOhm resistor to pin 14. They are soldered together on a 1cm (2.54 cm)*1cm (2.54 cm) sheet of copper tape. Do I have to search the error in the code or in the wiring?
Btw, if I short the pins with my finger, the value gets to zero, when removing the finger it jumps up to sub-100, but then immediately goes back to -2.

[BorisWild]

Too big resistors.

3 нояб. 2016 г. 1:22 пользователь "Max Rumpf" [email protected]
написал:

@BorisWild https://github.com/BorisWild I somehow can't get it to work
for me, it always throws a timeout (-2). This is my code:

#include <CapacitiveSensor.h>

CapacitiveSensor csense = CapacitiveSensor(12, 14);

void setup() {
Serial.begin(115200);
}

void loop() {
Serial.println(csense.capacitiveSensor(30));
}

I have a 10MOhm resistor wired up to pin 12, and a 1KOhm resistor to pin
14. They are soldered together on a 1cm*3cm sheet of copper tape. Do I have
to search the error in the code or in the wiring?

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[Maxr1998]

@BorisWild Well, example code said:

Uses a high value resistor e.g. 10M between send pin and receive pin
Resistor effects sensitivity, experiment with values, 50K - 50M. Larger resistor values yield larger sensor values.
Receive pin is the sensor pin - try different amounts of foil/metal on this pin

What values would you recommend for the ESP then?
I want it to sense through a 2mm sheet of plastic, that's why I ask.
Thanks for your help! :)

[Maxr1998]

Ok, I tested my resistor values on an Arduino Mega, where they work fine.
Now I just need to adapt them to my ESP8266.

[rmeister]

Came here for the same problem as Maxr1998, but found out that in my case reason for the error was different: The library does not support GPIO16 on the ESP8266.

I use a 10K resistor for direct touch sensing.

[Maxr1998]

Forgot to update, it also works for me now, with a 100k to 200k resistor through a 1mm layer of plastic.