Issue with scroll pHAT HD - [Errno 121] Remote I/O error

@danitres wrote:

Hi everyone,
I’m having some issue with the Scroll pHAT HD. Every time I used it with the raspberry pi Zero WH, after the commands:

import scrollphathd as sphd
sphd.set_pixel(1, 3, 0.5)
sphd.show()

(or after set other pixels configuration) I got the same error message:
pi@zero2:~ $ python conta_1

Press Ctrl+C to exit!

Traceback (most recent call last):
File “conta_1”, line 35, in
scrollphathd.show()
File “/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py”, line 550, in show
self.setup()
File “/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py”, line 106, in setup
self.show()
File “/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py”, line 590, in show
self._bank(next_frame)
File “/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py”, line 627, in _bank
self.i2c.write_i2c_block_data(self.address, _BANK_ADDRESS, [bank])
IOError: [Errno 121] Remote I/O error

and some “random” pixels light up (see the pic that I attached, the “random pixel configuration” on the pHAT HD is something similar)

Here’s the output of running i2cdetect -y 1

pi@zero2:~ $ 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 – -- –

I tried the same raspberry pi Zero WH (with the same GPIO Hammer Header (Solderless) - Female) and another scroll phat HD and, with this configuration, everything works properly.

Since i saw in some forum that this issue could be related to the soldering of the header, i tried to connect directly the pinout of raspberry pi with the phat hd, but i got the same issue:

pic2.jpg3024x4032 2.22 MB

Some advice?

Many many thanks!!!

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