MT32-Pi Works, but Does Not Turn On OLED Is Not Detected!

[marcelosofth]

MT32-Pi works, but does not turn on OLED and is not detected!

I'm using a Raspberry Pi 3A + and the curious thing is that it's working, but the Mister doesn't detect and neither the display turns on, the detail that I noticed is that the Raspberry is heating up a lot, has anyone seen something like this?

[cursedverses]

Is it a new MT32-Pi? Could you have a faulty hat?

I assume you've set the OLED in the config.txt:

Code: Select all

# Select LCD driver.
#
# Note that LCDs connected via I2C, you must also set the correct address for
# your device via the i2c_lcd_address option. Consult its datasheet, or see
# our documentation for tested models and their configurations.
#
# Values: none*, hd44780_4bit, hd44780_i2c, sh1106_i2c, ssd1306_i2c
#
# none:         No LCD
# hd44780_4bit: Hitachi HD44780 or compatible (e.g. WS0010, RS0010) character
#               LCD connected to GPIO pins in 4-bit mode (see documentation for
#               pinout)
# hd44780_i2c:  As above, but using an I2C "backpack"
# sh1106_i2c:   Small I2C-based OLED graphical display (usually 1.3")
# ssd1306_i2c:  Small I2C-based OLED graphical display (usually 0.96")
type = ssd1306_i2c

# Set the width of the LCD.
#
# If the display is a character display, this value is measured in characters.
# Otherwise, for a graphical display, this is measured in pixels.
#
# Note that not all dimension settings are valid; see documentation for valid
# configurations for each LCD driver.
#
# Values: 20-128 (128*)
width = 128

# Set the height of the LCD.
#
# Same characters vs. pixels considerations as for width.
#
# Values: 2-64 (32*)
height = 64

# Set address (hexadecimal) of I2C LCD.
#
# This will be used to communicate with LCDs connected via the I2C bus.
#
# Values: 00-80 (3c*)
i2c_lcd_address = 3c

# Rotate the display output (graphical LCDs only).
#
# Some graphical displays support rotation. Use this option if you need to turn
# the display around.
#
# Values: normal*, inverted
#
# normal:   No rotation
# inverted: The display output is upside down
rotation = normal

[marcelosofth]

I received it via letter from a very long distance to my house, the 2 plates came unprotected within 7m simple envelope, do you believe it may have arrived defective? How can damage 2 flat pcbs without components? Is there any case with broked?

Ps. A friend sends me all the contents of the sd card that's working for him, I just unzipped it to my SD card, as I said it's working, I tried the AO486 and X68000, I noticed the Raspberry is too hot the little I used it and then I turned it off!

[blacklistedcard]

Are you using an I/O board that is earlier than 6.1? I had a v5 board and it's not compatible with the MT32-PI. Its missing the resisters.

[LamerDeluxe]

The Pi running hot is normal. I have a metal Ugeek Pi case which helps with the heat and you can feel that getting pretty warm.

Make sure you set all the config settings correctly according to the MT32-pi Wiki.

Also if you got your IO board from AliExpress or Amazon, it might have a non-functioning user port.

[marcelosofth]

Friend, I correctly configured the "MT32-pi Wiki" including a friend gave me the content of his SD Card that he uses perfectly in his Mister, so the problem with the "mt32-pi.cfg" is not, follow the photo link of my I/O purchased on Aliexpress!

PCB:

pcb.jpg (665.33 KiB) Viewed 15332 times

[LamerDeluxe]

Friend, I correctly configured the "MT32-pi Wiki" including a friend gave me the content of his SD Card that he uses perfectly in his Mister, so the problem with the "mt32-pi.cfg" is not, follow the photo link of my I/O purchased on Aliexpress!

I don't see anything obviously wrong with that board, but I don't know if that type of IO board is known to work correctly with the MT32-pi. Have you tried using a separate power supply for the MT32-pi?

[marcelosofth]

I've already used a font directly on Raspberry and everything remained the same, without changes, a detail, regardless of whether the IO supports the MT32pi the OLED has to turn on immediately when you turn on the MT32pi button right? because I think the fact that the OLED doesn't turn on has something indicating that that's why Mister doesn't recognize it!

[thisisamigaspeaking]

I just unzipped it to my SD card, as I said it's working

How do you know that your MT32-pi works?

[Grumpy-Old-Gamer]

Does your PSU offer enough amps to power the Raspberry Pi over the SNAC port ?

Is the USB 3.0 cable used short enough as this can cause issues ?

[Malor]

I just unzipped it to my SD card, as I said it's working

How do you know that your MT32-pi works?

This is an excellent question.

OP: Continuing to insist that the MT32-Pi works, while also complaining it doesn't work, seems, er, counterproductive.

As others have suggested, the power supply is a likely source of the problem.

[thisisamigaspeaking]

I just unzipped it to my SD card, as I said it's working

How do you know that your MT32-pi works?

This is an excellent question.

OP: Continuing to insist that the MT32-Pi works, while also complaining it doesn't work, seems, er, counterproductive.

As others have suggested, the power supply is a likely source of the problem.

Looking back over the conversation I see:

as I said it's working, I tried the AO486 and X68000, I noticed the Raspberry is too hot the little I used it and then I turned it off!

So I think perhaps it was working initially but is no longer working? Otherwise I'm not clear under what circumstances it was ever working from the conversation. I took it to mean more like "the SD card should be valid, the Pi should be working, the hat is new, so it's working!" but I'm not sure at all.

[Malor]

Ah, okay, I missed that.

Being really hot can be a sign of not getting enough voltage; the system then pulls more amps to try to compensate, and amperage is what makes things get hot.

Using a separate power supply for the Pi, and turning off the power switch on the hat so the current doesn't flow backward, would be a useful experiment.

[thisisamigaspeaking]

I had necro'd an old thread, and it was solved in an apparent duplicate thread: viewtopic.php?t=3944