Search found 7 matches

by Raul_
Tue Jan 22, 2019 4:48 am
Forum: Technical Discussion
Topic: how to change i2c device address (Multi mlx90614 sensors)
Replies: 1
Views: 280

how to change i2c device address (Multi mlx90614 sensors)

Hi, engineers from OpenMV. I want to connect multi mlx90614 temperature sensors to OpeMV and I met some problem when I assigned unique address to them. I write a script in python below. Erase the address by setting them zeros (according to EEPROM memory address in datasheet, I attach it in attachmen...
by Raul_
Sat Jan 19, 2019 6:02 am
Forum: Technical Discussion
Topic: QUESTION ABOUT FIR(MLX90640) CONNECTION
Replies: 4
Views: 377

Re: QUESTION ABOUT FIR(MLX90640) CONNECTION

Can you give me some more information? It works for me with my MLX 90640 sensor from SparkFun. I notice you are using a different sensor. Do you see any other behavior? Some I can know what went wrong? That error is generated only via with the I2C bus not getting an ACK on reading or the sensor gen...
by Raul_
Sat Jan 19, 2019 1:08 am
Forum: Technical Discussion
Topic: QUESTION ABOUT FIR(MLX90640) CONNECTION
Replies: 4
Views: 377

Re: QUESTION ABOUT FIR(MLX90640) CONNECTION

That would be an I2C error. Um, did the init method succeed? The error is caused by this code: https://github.com/openmv/openmv/blob/master/src/mlx/src/MLX90640_API.c#L48 Um, also, keep in mind the FPS on the MLX sensor. So, you cannot run it at a very high sample rate in hz. The default sample rat...
by Raul_
Fri Jan 18, 2019 4:45 am
Forum: Technical Discussion
Topic: QUESTION ABOUT FIR(MLX90640) CONNECTION
Replies: 4
Views: 377

QUESTION ABOUT FIR(MLX90640) CONNECTION

hi! engineers from Openmv. I just bought a openmv and meet a problem when I connect it to a mlx90640 sensor. I download your new released IDE and when I tried to run the program it tells me it cannot read the data. Can you help me?

By the way, openmv is really a good product. Thanks for your work!
by Raul_
Fri Jan 18, 2019 4:33 am
Forum: Technical Discussion
Topic: QUESTION ABOUT I2C CONNECTION
Replies: 4
Views: 1555

Re: QUESTION ABOUT I2C CONNECTION

iabdalkader wrote:
Fri Jan 11, 2019 9:31 pm
I think you're connecting VIN to VIN, that's the power input pin on the OpenMV cam. You should connect the sensor's VIN to 3.3/vout.
Thank you very much!!!! It really fixes my problem!! OpenMV is really a easy-to-use product!
by Raul_
Fri Jan 11, 2019 8:54 pm
Forum: Technical Discussion
Topic: QUESTION ABOUT I2C CONNECTION
Replies: 4
Views: 1555

Re: QUESTION ABOUT I2C CONNECTION

kwagyeman wrote:
Fri Jan 11, 2019 12:09 pm
Hi, you need pull up resistors on the I2C lines. The OpenMV Cam doesn't pull the lines up by default. I2C Scan should work once you do that.
Thank you very much for your reply. I check my sensor and it is integrated with pull up resistors.

QAQ
by Raul_
Fri Jan 11, 2019 8:41 am
Forum: Technical Discussion
Topic: QUESTION ABOUT I2C CONNECTION
Replies: 4
Views: 1555

QUESTION ABOUT I2C CONNECTION

HI, engineers from OPENMV! I am a newcomer and I just met some problems when connecting my openmv to a mlx90614 temperature sensor. i guess it is the connection problem since I have try to `i2c.scan()` and no valid address returned. this is my code and how i connect the wires. # This example is to g...

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