Scroll Phat - Remote I/O error

@phpchap wrote:

Hi there, this is my first RPI project and I’m having issues getting the scroll phat working :/

I’m using the hammerless solder kit and i’ve made sure all the connections are tight.

The following code:

#!/usr/bin/env python

import scrollphat
import math
import time
import sys

i = 0
buf = [0] * 11
scrollphat.set_brightness(20)

while True:
    try:
        for x in range(0, 11):
            y = (math.sin((i + (x * 10)) / 10.0) + 1) # Produces range from 0 to 2
            y *= 2.5 # Scale to 0 to 5
            buf[x] = 1 << int(y)

        scrollphat.set_buffer(buf)
        scrollphat.update()

        time.sleep(0.005)

        i += 1
    except KeyboardInterrupt:
        scrollphat.clear()
        sys.exit(-1)

running the above yields:

Traceback (most recent call last):
File "test.py", line 3, in <module>
    import scrollphat
File "build/bdist.linux-armv6l/egg/scrollphat/__init__.py", line 20, in <module>
File "build/bdist.linux-armv6l/egg/scrollphat/IS31FL3730.py", line 21, in __init__
File "build/bdist.linux-armv6l/egg/scrollphat/IS31FL3730.py", line 62, in set_mode
IOError: [Errno 121] Remote I/O error

My scroll phat has i2c addr: 0x74 on the back of the board, also running :

pi@scrollpi:~ $ i2cdetect -y 1
    0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- 74 -- -- --                         

so it looks like it can ‘see’ the board, but not communicate with it…

any ideas would be very welcome…

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