user136941
Member since Nov 2021 • Last active Mar 2022Most recent activity
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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. -
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 read8 bits
from device0x68
to the address0x75
: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
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I tested it, detects two devices in
0x68
(that is MPU) and0x76
(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
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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
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- 3 comments
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Thanks, is already edited the device is
0x68
trying to read the register0x75
orWHO_AM_I
.I didn't know that the second parameters accept Bytes.
Now its works, but the library
MPU9250
don't work.