OLED Display for Minitiouner V2 with FTS4334L

[radiogareth]

I think I have solved it....
The arduino software reports (from here https://gist.github.com/tfeldmann/5411375)

"I2C device found at address 0x3C"

Now I know why it won't work on MT V0.8. Any chance of a third button Jean-Pierre, 'TestOLEDMaster3' or maybe a box to put in the address of a known device?

But at least I have solved it with help from the amateur community. Why its address is coming up different to that indicated on the boards and which MT0.8 expects is known only to the wiley manufactures!!

Thanks all.

Over on VIVADATV Jean-Pierre posted "using the software "TestMy MiniTiounerPro v0_1b":

"Test OLED1 Master" will test oled at address 78h and "Test OLED2" test oled at address 7Ah"

Now I know.....

Gareth, G4XAT

[M0DHP]

Hi Gareth

I'm not sure that is the source of your problem. The I2C scanner returns the 7-bit version of the address (i.e. the top 7 bits of the address byte ignoring bit 0 which is a read / write flag). If you factor in bit 0 (which shifts the address one bit left), 0x3C becomes 0x78, which is how the board is marked. See this reference: https://github.com/ThingPulse/esp8266-o ... issues/179

Now, question is whether JP is using 7 or 8 bit convention in his post. If it's 8-bit, then MT is looking for the same address as your board, so doesn't explain your problem. If MT is in fact looking for 0x78 as a 7-bit address, then there must be two variants of the board in the wild, labelled the same but configured differently.

Maybe someone with a working MT with OLED could run the scanner to see what they get.

73
Ray M0DHP

PS I'm sure you've checked but is there any chance of a wiring problem with the connection to the MT?

EDIT This reference suggests that 0x78 and 0x7A could not be valid 7-bit addresses.

https://www.totalphase.com/support/arti ... Addressing

So it looks like your board does have the address that the MT software is expecting.

[radiogareth]

Thanks for the info Ray, wiring has been checked, several times, just to check my sanity. I'm away from the hardware as of Monday but I'd love to know quite why this is giving me the runaround.
The software that works with the displays (from here https://www.instructables.com/id/3D-Pri ... att-Meter/) has this line: U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0); and various other stuff to do with simple measurments.
I'm not any sort of arduino expert so I don't know how its managing to talk to the display, but it does. Maybe there's a hint in the "NONE'' statement (like its just broadcasting the data) but that can't work with something else on the bus as in the case of a MT.

Closer but 'no cigar yet'......

73

Gareth

[M0DHP]

Gareth

I've found a thread on vivadatv from August last year: http://www.vivadatv.org/viewtopic.php?f ... 6b1aac7244

Jean-Pierre had same problem as you using a 0.96 OLED with SSD1306 driver: worked ok with Arduino, but not with MT. Seemed to be due to I2C ack bit differences.

In the second to last post, J-P says he changed to a 1.3 OLED with SH1106 driver and this worked.

Might this be the problem? EDIT Alain's OP in this thread mentions 1.3" OLED.

73
Ray

[g0mjw]

Interesting, but none of us are using the 0.96" OLEDs, we are using the 1.3" ones, so maybe the one Gareth has is a hybrid.

The one I bought "1.3" IIC I2C SPI Serial 128X64 OLED LCD Display Module For Arduino Blue" is no longer listed but putting that search in now brings up a module that looks a lot like the same one except I can't see an address select. I also noted there are many fewer listings than there were a year ago, so I expect they are running out.

[M0DHP]

Mike, I was going on Gareth's earlier post where he mentioned 0.96" units on eBay. Also the Arduino code he posted refers to SSD1306.

[g0mjw]

Mike, I was going on Gareth's earlier post where he mentioned 0.96" units on eBay. Also the Arduino code he posted refers to SSD1306.

I missed that but I am still assuming the unit Gareth has is a 1.3" one. Looks like it in the photo he posted. Hence my thought it may be a hybrid or a 1.3" screen with a different controller. If that is the case I don't know how one would find out though, or how to make sure when you order one it is the right type. It clearly works with the Arduino so possibly just a few code changes.

Mike

[radiogareth]

I think I have the 0.96 units, (looking back at my eBay purchases). Looks like they won't work for presumably address compatibility reasons. As they have the same resolution as the 1.3" (128*64) I assumed they would be plug'n'play.
Clearly not, but at least they work with the arduinos.....

That's going to spoil my end panel, after I filed the hole square (90 deg) and drilled the holes accurately.

Might go for a bigger Digole screen, but not sure there's much benefit TBH, other than removing evidence of my small screen error.

Note to self, write things down and then remember where I wrote things down.....but I have learnt a bit more about I2C

73

Gareth

[g0mjw]

That's going to spoil my end panel, after I filed the hole square (90 deg) and drilled the holes accurately.

You can buy replacement front panels, e.g. https://www.digikey.co.uk/product-detai ... ND/4490794

[radiogareth]

So I can, in packs of 10 it seems! I'll have to get some cad done for the 3-D printer and make it a featured external mount