External libraries and I2C via UIFLOW

hetzer

It would be really to nice to have a tutorial using I2C blocks of UIFLOW and using external I2C devices. I tried to get readings from Adafruit BNO055 using execute block but just receive errors.
Did anyone try to connect a non M5STACK I2C sensor via UIFLOW ?

world101

I wanted to know the same thing. I just received this one from Seed Studio that I’m trying to get working with uiFlow.

https://www.seeedstudio.com/Grove-I2C-Mini-Motor-Driver-p-2508.html

ajb2k3

@hetzer said in External libraries and I2C via UIFLOW:

It would be really to nice to have a tutorial using I2C blocks of UIFLOW and using external I2C devices. I tried to get readings from Adafruit BNO055 using execute block but just receive errors.
Did anyone try to connect a non M5STACK I2C sensor via UIFLOW ?

Yes and I did get some limited success but haven't had the time to continue work on it.
I2c works a bit funny in the latest versions of uiflow and takes some getting used to.
It takes a combination of uiflow blocks and micropython hacking to get things to talk.

@world101 said in External libraries and I2C via UIFLOW:

I wanted to know the same thing. I just received this one from Seed Studio that I’m trying to get working with uiFlow.

https://www.seeedstudio.com/Grove-I2C-Mini-Motor-Driver-p-2508.html

That looks useful

lukasmaximus

I have also been trying myself many times to interface with an I2C device and was only once successful with a sevseg display from seeed. This was back before we switched back to the main micropython branch and now I2C seems completely broken for anything other than M5Stack devices. If i use commands from the micropython 11.1 documentation I always get bus error, here is the precious little information about I2C commands in the latest UIflow firmware.

import i2c_bus
# port i2c_bus.PORTA, i2c_bus.PORTB or (sda, scl)
i2c1 = i2c_bus.easyI2C(port, addr)

i2c1.write_u8(reg, data)
# byteorder: 'big' or 'little'
i2c1.write_u16(reg, data, byteorder='big')
#
data = i2c1.read_u8(reg):
# byteorder: 'big' or 'little'
data = i2c1.read_u16(reg, byteorder='big')
# data is bytes
data = i2c1.read(num)
# state: True or False
state = i2c1.available()
# addrList is a available addr list
addrList = i2c1.scan()

jvmo

@lukasmaximus

I read Sipeed Grove i2c sensor from m5stick C like this

from m5stack import *
from m5ui import *
from uiflow import *
import i2c_bus

i2c1 = i2c_bus.easyI2C(i2c_bus.PORTA, 0x45)

i2c1.write_u8(0x24, 0x00)
time.sleep(0.016)

data = i2c1.read(6)
temperature = data[0] * 256 + data[1]
celsius = -45 + (175 * temperature / 65535.0)
humidity = 100 * (data[3] * 256 + data[4]) / 65535.0

lcd.print(celsius,0,5,0xffffff)
lcd.print(humidity,0,20,0xffffff)

robinkam

@jvmo said in External libraries and I2C via UIFLOW:

i2c1.write_u8(0x24, 0x00)

Thanks for the sample code. I am trying to use UIFlow to write a program running on M5Stack Core on the BTC Base with DHT12 sensor. I found it kept reading wrong data until the i2c1.write_u8(0x24, 0x00) sentence in your code inspired me.

Wolli01

@robinkam Could you post the micropython code for it?
That would be great, because I can't get it to work.