user136941

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• How to read data from device in I2C?

  in ESP8266 • 2 years, 11 months

  

  Thanks, is already edited the device is 0x68 trying to read the register 0x75 or WHO_AM_I.

  I didn't know that the second parameters accept Bytes.

  Now its works, but the library MPU9250 don't work.

• How to read data from device in I2C?

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• How to read data from device in I2C?

  in ESP8266 • 2 years, 11 months

  

  Hello, I'm trying to figure out an error, when I realized that the problem is that I'm using wrong the I2C function. I need to read 8 bits from an address (0x75) in a i2c device (0x68). Following code is an example from libraries and docs:

  I2C1.setup( {scl: NodeMCU.D4, sda: NodeMCU.D5} );
  
  I2C1.writeTo(0x68,0x75);
  var data = I2C1.readFrom(0x75,8);
  console.log(data);
  

  Got the next error:

  Uncaught InternalError: I2CRead: No ACK 0
   at line 5 col 33
    var data = I2C1.readFrom(0x75,8);
                                  ^
  in function called from system
  

  The readFrom function doesn't take as parameter the internal address of the device, that's why the error, is pointing to a device no to the internal address.

  My device is an MPU9250, it works on Arduino and Micropython.

• Problems with i2c in esp8266 (MPU9250 [GY-91])

  in ESP8266 • 2 years, 11 months

  

  I'm trying to call WHO_AM_I, don't know if this is the correct way to read data, but this is how it works the module, the example in page doesn't explain well, I mean, how to read 8 bits from device 0x68 to the address 0x75 :

  I2C1.setup( {scl: NodeMCU.D4, sda: NodeMCU.D5} );
  
  I2C1.writeTo(0x68,0x75);
  var data = I2C1.readFrom(0x75,8);
  console.log(data);
  

  But still got the same error:

  Uncaught InternalError: I2CRead: No ACK 0
   at line 5 col 33
    var data = I2C1.readFrom(0x3B,8);
                                  ^
  in function called from system
  

• Problems with i2c in esp8266 (MPU9250 [GY-91])

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• Problems with i2c in esp8266 (MPU9250 [GY-91])

  in ESP8266 • 2 years, 12 months

  

  I tested it, detects two devices in 0x68 (that is MPU) and 0x76 (Is the BMP).

  Here a full log of the error:

  Init MPU...
  Uncaught InternalError: I2CWrite: No ACK 0
   at line 1 col 15
  a.writeTo(12,c);return a.readFrom(12,d)
                ^
  in function "rmag" called from line 1 col 49
  ...ew Uint8Array(this.rmag(3,7))).buffer),b=49120/32760;return{...
                                ^
  in function "readMag" called from line 1 col 63
  ...eadGyro(),mag:this.readMag(),new:this.dataReady()}
                                ^
  in function "read" called from line 3 col 23
        data = mpu.read();
                        ^
  in function called from system
  Uncaught Error: Unhandled promise rejection: InternalError: I2CWrite: No ACK 0
  

• Problems with i2c in esp8266 (MPU9250 [GY-91])

  in ESP8266 • 2 years, 12 months

  

  Espruino have some function for scan all i2c devices connected?

• Problems with i2c in esp8266 (MPU9250 [GY-91])

  in ESP8266 • 2 years, 12 months

  

  Hello,

  I'm trying to read a gyroscope (GY-91), that have an MPU-9250 inside with an BMP-280. I'm using this library But I have some problems.

  When I'm run the code throw the next error:

  Uncaught InternalError: I2CWrite: No ACK 0
  

  I'm trying with a LCD i2c, in case that if is the module that is wrong, but got the same error. Also, doesn't work with D pins (D0, D1, D2...) only with numbers

  //This doesn't work
  I2C1.setup({ scl: D4, sda: D5 });
  //This works
  I2C1.setup({ scl: 2, sda: 14 });
  

  After change the numbers the LCD works, but the MPU still don't.

  Edit: A full log of the error:

  Init MPU...
  Uncaught InternalError: I2CWrite: No ACK 0
   at line 1 col 15
  a.writeTo(12,c);return a.readFrom(12,d)
                ^
  in function "rmag" called from line 1 col 49
  ...ew Uint8Array(this.rmag(3,7))).buffer),b=49120/32760;return{...
                                ^
  in function "readMag" called from line 1 col 63
  ...eadGyro(),mag:this.readMag(),new:this.dataReady()}
                                ^
  in function "read" called from line 3 col 23
        data = mpu.read();
                        ^
  in function called from system
  Uncaught Error: Unhandled promise rejection: InternalError: I2CWrite: No ACK 0
  

• Help with typescript

  in ESP8266 • 3 years

  

  Well, the Github issue is interesting, but I cannot find how to improve my template there. My template works, but is not well designed, I mean, is ugly.

• Help with typescript

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