Controlling speed of BLDC motor by I2C method.

koolguy · Apr 21, 2012

Hello everyone,

I want to make speed controller BLDC motor using I2C from micro controller using PIC.
please tell how to start programming of it??
using speed controller...

Thanks

3v0 · Apr 21, 2012

Schematic ?

koolguy · Apr 21, 2012

Here is the link of speed controller i have it also contain manual part..!!

**broken link removed**

3v0 · Apr 21, 2012

Are you saying you want to build a copy of the RKI-1350 speed controller or you want to know how to use I2C to talk to an existing RKI-1350 ?

koolguy · Apr 21, 2012

you want to know how to use I2C to talk to an existing RKI-1350

exact...

3v0 · Apr 21, 2012

This section from the manual tells you what you need to do. How you do it depends on the compiler and microcontroller.

I2C Address Selection
The default I2C address is 0x12. ADR2 shorted to GND will set the address to 0x14, ADR1
shorted to GND will set the address to 0x16, ADR1 and ADR2 shorted to GND will set the
address to 0x18. If the PPM signal is shorted to GND on start-up the driver will set the
addresses as 0x22, 0x24, 0x26 and 0x28 instead of 0x12, 0x14, 0x16 and 0x18. This allows for
an additional 4 address.
I2C Set Speed
Send an I2C start command with the I2C address that is set for the driver. Then write a byte
from 0 – 255 which denotes the speed of the motor. Then send the I2C stop command. The
motor speed will be set accordingly

koolguy · Apr 21, 2012

OK, please tell code of it!!

3v0 · Apr 21, 2012

something like this depending on the I2C lib, language etc.

IC2_Start(0x12);
IC2_SendByte(0x255);
IC2_Stop();

koolguy · Apr 21, 2012

But how to start coding for it?

koolguy · Sep 8, 2012

Hi again,

As i said i want control over BLDC motor by I2C using PIC16F877 please help me with C codes....

Thanks

phalanx · Sep 10, 2012

Post the code you have written so far and explain to us where you think the problem might be. We can then help you troubleshoot it.

sreenivas_89 · Nov 17, 2014

hi Ritesh kakkar ,

I am also got the same BLDC driver from robokits, I trying to control it through pic18f4550 (MIKROC Pro for pic compiler) but not getting success if have any code related to this please help me.

here is my code

void main(){
CMCON = 0b00000111; // Turn off Comparator
ADCON0 = 0;
PORTB = 0;
LATB = 0b00000000;
TRISB = 0; // Configure PORTB as output
delay_ms(6000);
I2C1_Init(100000); // initialize I2C communication
I2C1_Start(); // issue I2C start signal
I2C1_Wr(0x30); // send byte (device address + W)
I2C1_Wr(100);
I2C1_Stop(); // issue I2C stop signal
}

Controlling speed of BLDC motor by I2C method.

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