SX1509 and PENGLIN PWM

Other Miscellaneous
1

Hello Team,

I have an SX1509 IO Expander Board connected with a raspberry PI. I want to control a PWM connected to the IO Expander but have no idea how it works :shock:

This is the connected module (pin 8)

“DC 5V-36V 15A (Max 30A) 400W Dual High-Power MOSFET Trigger Switch Drive Module 0-20KHz PWM Setting Electronic Switch Control Board Motor Speed Control”

Could you help me with a python sample code?

I want to control the speed of aa mixer motor connected to the PWM.

Many thanks in advance.

2

https://forum.micropython.org/viewtopic.php?t=9178

I hope this will help you a bit.

3

Hi,

Thank you so much, but it does not help with what I am looking for.

4

Let me describe my need a bit better …

I have a mixer, and I connected the motor to a PENGLING PWM and the PWM MOSFET with the J1 pint to PIN 8 on the Raspberry.

What I would like to achieve is that control the speed of the mixer via the Raspberry.

I made a sample function below - would it work that way?

import busio
import board
from adafruit_bus_device.i2c_device import I2CDevice
import time
import SX1509
import IO_Types


Frequency = 20000


DEVICE_ADDRESS = 0x3E  # device address of SX1509

#Set up I2C
comm_port = busio.I2C(board.SCL, board.SDA)
device = I2CDevice(comm_port, DEVICE_ADDRESS)

#Initialize the expander
IOExpander = SX1509.SX1509(comm_port)
IOExpander.clock(oscDivider = 4)
IOExpander.debounceTime(32)

IOExpander.pinMode(8, IO_Types.PIN_TYPE_ANALOG_OUTPUT)


Def Mixing(MixTime_ms, Speed_%)
	DutyCycle = Frequency / 400000
	HighTime = DutyCycle * Speed_%
	LowTime = DutyCycle - HighTime
	
	While MixTime_ms < PassedTime:
		IOExpander.analogWrite(8, 1)
		Time.Sleep(HighTime)
		IOExpander.analogWrite(8, 0)
		Time.sleep(LowTime)
		PassedTime = PassedTime + HighTime + LowTime
5

have a mixer, and I connected the motor to a PENGLING PWM

No idea what this is. Links? Photos showing how it’s hooked up? What is it doing? What are you expecting it to do that it isn’t?

6

Hi,

Thanks for your reply. Here is a picture of how it is connected.

[

I am trying to run the mixer motor at different speeds while sending a PWM signal from the SX1509 Pin 8 to the PENGLIN PWM.

There is a PWM function on the raspberry where you define the frequency. I could not find the same for the SX1509 in the documentation.

I was wondering if I could generate the signal myself in a loop while turning it off and on. I just shared my idea here for the code but wasn’t sure if this is the right approach.

# Duty Cycle Is 20 kHz and should be 0.05 ms
# I want to give 50 % of the voltage to the motor so HighTIme = LowTime = 0.025

IOExpander.analogWrite(8, 1)
Time.Sleep(HighTime)
IOExpander.analogWrite(8, 0)
Time.sleep(LowTime)

I hope this describes it a bit better.](PNGLIN-PW-SX1509 hosted at ImgBB — ImgBB)