Hello, the library dont really want to work with my esp32s, anyone?

[marius240]

my code:

#include <Wire.h>

BH1750 lightMeter(0x5C);

void setup() {
  // put your setup code here, to run once:
  Wire.begin();
  Serial.begin(115200);
  lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
  delay(2000);

}

void loop() {
  // put your main code here, to run repeatedly:

  uint16_t lux = lightMeter.readLightLevel();
  Serial.print("Light level: ");
  Serial.println(lux);

  delay(5000);


}

The cabling:

D21 -> SDA D22 -> SCL GND & ADDR -> gnd VCC -> 3.3V

[marius240]

btw my it gives me error: [BH1750] ERROR: received NACK on transmit of address in the start and then for the rest of the time just: Device is not configured! Light level: 65534

[marius240]

the board is NodeMCU ESP32S

[marius240]

i2cdetect just gives me

[marius240]

Need help ASAP! @claws @wridgers @goebish @NuTTeR

thanks <3

[goebish]

try with Wire.begin(21, 22);

[marius240]

@goebish nope aint working

[marius240]

still same error, just ERROR: received NACK on transmit of address

[goebish]

Have you tried to add pull up resistors between SDA<->3.3V and SCL<->3.3V ? I'm not sure Wire.begin takes care of that. If that doesn't work, then I don't know, have you tried with another i2c device such as a small oled display ?

[marius240]

nope dont have another ic2 device, and dont think i got a pull up resister,

[marius240]

but im pretty sure there is no need for a pull up resistor

[goebish]

just use any 1k-30k resistors, that should be fine, you need 2

[marius240]

so a resistor between D21 -> SDA and D22 -> SCL ?

[marius240]

why should a resistor change anything? just asking :D

[goebish]

no, between SDA -> 3.3V & SCL -> 3.3V

[goebish]

because i2c lines need to be pulled up https://rheingoldheavy.com/i2c-pull-resistors/ It could be done in software in the i2c lib, but I'm not sure that's the case, just check with pull up resistors, you've nothing to lose ;)

[marius240]

not sure what you mean, there is no between SDA and 3.3v i think photo otw

[goebish]

well, just connect a 10k or so resistor between +3.3V and SDA ... same for SCL

[marius240]

im trying to say, i connect direct from the board to scl, there is no connection to 3v between i can interact with

[marius240]

[marius240]

i have a 3v pin ofc, but i sounds weird if i should hook the up to them

[marius240]

btw the blue line is ground and the red is 3.3v

[marius240]

@goebish

[goebish]

yes, just connect this 3.3V line to SDA through a resistor ... same for SCL, don't change anything else

[marius240]

lul ok,

[goebish]

don't worry, you can't get the magic smoke out just by adding pull up resistors ;)

[marius240]

hmmm it didnt work just hooking 3.3v onto scl and sda

[marius240]

without resister tho

[goebish]

... don't do that, that could damage the esp! resistors are important!

[marius240]

oh something changed, when i unplug both 3.3v it says ERORR: received NACK on transmit of address but if i connect 3.3v to either one or both i get ERROR: received NACK on transmit of data

[marius240]

@goebish