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Forum Index : Microcontroller and PC projects : Alternative take on the 5" SSD1963 + PicoMite

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Mixtel90

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Posted: 09:46am 13 Jan 2022
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I couldn't resist when Peter asked Grogster for an adapter board...
I omitted the 7" option as I have no mechanical info on that, or any requirement for one. However, I did attempt to make up for the lost IO using a Micromite.




-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
lizby
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Posted: 02:25pm 13 Jan 2022
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Now you're talking. Did someone say, "On a roll".

I think Grogster's 9" EastRising SSD1963 adaptor would work on this (but I haven't looked closely).

Now we need breakouts for the MX150 pinout.

Again functional similarity to the F4, but maybe fewer solder points.
 
Mixtel90

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Posted: 03:01pm 13 Jan 2022
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Oh, the 5V I2C interface on this should interface directly with the I2C expander (same connector, same pin order).
The blob connectors for the SD cards are normally both enabled, but you can cut one or the other to disable it if required.

I've tried doing a version for RS485 instead of I2C but it's not working out well. The MAX485 is a 5V chip so I have to use two of the level shifters for it and the track weaving is a pain. I'd like to stick with the same chip really. It might still happen. :)

Can you still get the MX150?
(Come to think of it, can you still reliably get *any* silicon?)
-- Mick

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lizby
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Posted: 06:20pm 13 Jan 2022
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Sorry, meant MX170, "MM2" micromite.

Re "breakout", I meant routing the output pins of the micromite header to a user-specific configuration--a custom PCB (which the user would have to design).
 
Mixtel90

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Posted: 06:28pm 13 Jan 2022
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Well, you can use the RPi "breakout" cable.

No point in routing the CMM2 to line up with a parallel (or SPI for that matter) LCD display as it doesn't support them.

Did you have something particular in mind?
-- Mick

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lizby
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Posted: 07:23pm 13 Jan 2022
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"MM2" (MX170), not "CMM2".

Which RPi "breakout" cable for the 2x13 header?

>Did you have something particular in mind?

Just a variation of PaulL's geothermal controller: 2 on/off, 2 count, 13 temp inputs, 7 outputs, SSD1963 GUI, e.g., for the Explore-64:

                   SSD1963 D5 1 | +         + | 64 SSD1963 D4
                   SSD1963 D6 2 | +         + | 63 SSD1963 D3
                   SSD1963 D7 3 | +         + | 62 SSD1963 D2
           spi2 clk (SD, LCD) 4 | *         + | 61 SSD1963 D1
           spi2 out (SD, LCD) 5 | *         + | 60 SSD1963 D0
                   CONSOLE RX 6 |             | 59 COM1: RX ESP-01
                       *Reset 7 |             | 58 CONSOLE TX
                     SPI1 out 8 |    MM64   + | 55 output5
                    COM2: TX 11 |   Explore + | 54 output6
         SD Card Chip Select 12 | *  PCB      | 53 output7
                    COM2: RX 13 |           + | 52 Water Volume to Yard
              SD Card Detect 14 | *         + | 51 Water Volume to Tank
             ESP-01 COM1: TX 15 |           + | 50 Yard Feed Temp  
            output1 COM3: TX 16 | sim       + | 49 input15 ?Blower
            output2 COM3: RX 17 | sim       + | 48 input14 Deep Ground Temp
              Freon Low Temp 18 | +         * | 47 spi2 in (SD, LCD)
         Freon Exp. Low Temp 21 | +         + | 46 Yard Return Temp
        Freon Exp. High Temp 22 | +           | 45 output4
              Tank Feed Temp 23 | +         * | 44 I2C Clock
            Tank Return Temp 24 | +         * | 43 I2C Data (RTC)
            Tank Center Temp 27 | +           | 42 Freon High Temp
            TCP ESP-01 reset 28 |             |  
                Hallway Temp 29 | +           |
                Outside Temp 30 | +           | 3.3V output (100mA max)
                     output3 31 |             | 5V (input or output)
            Generator ON/OFF 32 | +           | 0V
                Mains ON/OFF 33 | +           |


~
Edited 2022-01-14 05:25 by lizby
 
Mixtel90

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Posted: 08:36pm 13 Jan 2022
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Oh, sorry. I'm not conversant with the MM2 or the MM64 Explore. I've seen them mentioned, that's all. :)

The CMM2 can use a RPi 40-pin GPIO cable to connect it to a breadboard. You can connect whatever you like then.

The 2x13 header used to be used for RS-232 connections from a DB25 connector to a board. Very easy to get the bits and make your own cables if you have a bench vice (although I've been known to use a block of wood and a hammer before now. lol

(puts salesman hat on)
You should be able to implement that geothermal controller with a SSD1963 display, a PicoMite, this SSD1963-PicoMite adapter board and this I2C expander module, sir. :)
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
lizby
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Posted: 09:07pm 13 Jan 2022
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"MM2" ("Micromite II") is what's on your board, 28-pin MX170 chip. (I think Micromite I was the MX150 version, but I'm not sure because that was before my time on the forum.)

I'll order the board to have a play when you post the gerbers. A play is all it will be, since the project never made it to implementation. With 3300+ lines of code, though, and a lot of I/O it does provide a pretty good MMBasic workout.
 
Mixtel90

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Posted: 09:26pm 13 Jan 2022
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Sheesh... it sounds like it was quite a feat! :)

I think you're right about the MX150. Geoff mentions it in the Micromite manual, pointing out that the current code no longer runs on it.

The only thing that bothers me about the board as it stands is that I'm not sure how much space there is under that RTC module because the battery seems to be there. As you can see, I've put resistors underneath so I'm hoping there's enough space! I've not got one to measure and, of course, there's no mention of that dimension in adverts. I suppose the resistors could go on the bottom of the board if it turns out not to fit.
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
lizby
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Posted: 09:40pm 13 Jan 2022
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My own preference for an RTC module is this one
 
Mixtel90

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Posted: 09:46pm 13 Jan 2022
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I like that one, but I've had a couple that aren't terribly accurate. In fact, on the RS485 version of this board that I've been playing with, I used one of these to gain more board space. It's also what I used on my PicoMite Backpack and what I've built into the I2C expansion module.
Edited 2022-01-14 07:47 by Mixtel90
-- Mick

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lizby
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Posted: 11:14pm 13 Jan 2022
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Here are 2x13 flat ribbon cable and IDC26 sockets.

How many PicoMite pins are available?

~
Edited 2022-01-14 09:28 by lizby
 
lizby
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Posted: 03:36am 14 Jan 2022
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Hmmm, by my count, with 24 pins needed (2 count, 2 on/off inputs, 12 temperature, 8 output) and with no keyboard, GP8,9,17,26,27,28 available on the Picomite, I'm one pin shy unless pins 11 & 12, console Tx and Rx, are available for use.

And I'd like to have 2 pins available for an ESP-01.

Picomite:
GP08 Yard & Tank Pump
GP09 Hot water Boiler Gas & Pump
GP17 Air Handler Pump & Blower
GP26 Air Handler Burner
GP27 Freon Compressor
GP28 Freon Reverse

and

                     *Reset  1 |             | 28 ANALOG POWER
                Mains ON/OFF 2 |             | 27 ANALOG GROUND
              Tank Feed Temp 3 |             | 26 Blower
            Tank Return Temp 4 |             | 25 Freon Low Temp
            Tank Center Temp 5 |             | 24 Freon Exp. Low Temp
                Outside Temp 6 |    MM28     | 23 Freon Exp. High Temp
            Generator ON/OFF 7 |    I/O      | 22 Yard Feed Temp
                         0V  8 |             | 21 Yard Return Temp
               Hallway Temp  9 |             | 20 +V TANT CAP
           Deep Ground Temp 10 |             | 19 0V
                 CONSOLE TX 11 |             | 18 I2C Data (Picomite, RTC)
                 CONSOLE RX 12 |             | 17 I2C Clock
               VCC 2.3-3.6V 13 |             | 16 Water Volume to Yard
            Freon High Temp 14 |             | 15 Water Volume to Tank


Pin lacking for Joist Pump (but since this is just for playing, that auxiliary pump can be omitted).

The code for the MX170 in the Getting Started with the Micromite manual doesn't include reading a temperature from a DS18B20, so that code would have to be added--not hard to do with a little fiddling to make sure that the temperature that is returned instantaneously has been read in the past second.

Considering the shortage of pins on the Picomite, I wonder if 8-bit parallel might be considered for the SSD1963 as with the MM+ (see page 13 in the MM+ Manual) instead of 16-bit parallel.
 
Mixtel90

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Posted: 08:04am 14 Jan 2022
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Using the SSD1963 (in 8-bit mode) a USB keyboard and SD card on the PicoMite there are 6 spare pins. I used two of those for I2C to give me a further 17 from the Micromite, so that's 21 IO in total. I don't consider the Micromite IO to be particularly slow for control purposes - the real world is usually a lot slower than I2C. :) Of the 4 remaining pins 3 are the PicoMite ADC inputs and the Micromite has a further 10, so there are 13 possible analogue inputs, if you felt like going that way.

A PicoMite is now cheaper than an "official" 28-pin MX170 bought from Farnell. The main reason I didn't use one for the I2C expansion module is it's lack of ADC inputs.
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
lizby
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Posted: 02:01pm 14 Jan 2022
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Ahh, d'oh--seeing DB08-DB15 labelled on the PCB I didn't twig that they were unconnected, so the SSD1963 is already in 8-bit mode.

I also didn't realize that the I2C slave could be another picomite--that might be a better solution for me, since space isn't all that tight.
 
Mixtel90

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Posted: 02:29pm 14 Jan 2022
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I think I've solved having an I2C connected Micromite (still with SDA and SCL on the IO connector, but 3V3 only, I'm afraid) and a 5V RS485 connection both on the SSD1963 adapter board. :)  Down to just GP26 free now. Should I add a buzzer? Hmmm...

You can run any of the 'mites as an I2C master or slave AFAIK, providing there is some sort of I2C port - even if it's bitbanged. The MMBasic code is in the Getting Started manual for the Micromite and it's very simple. (Nice one Geoff!)
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
lizby
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Posted: 03:55pm 14 Jan 2022
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  Mixtel90 said  You can run any of the 'mites as an I2C master or slave AFAIK, providing there is some sort of I2C port - even if it's bitbanged


Hmm, I don't see I2C SLAVE as a command in the Picomite manual, and I get this:

run
[5] I2C SLAVE OPEN &H26, 0, 0, WriteD, ReadD ' slave's address is 26 (hex)
Error : Syntax


It's not in the MM+ or F4 manual either, so perhaps it's only on the MM2. Might be interesting to try the 44-pin MM2. I have a vague recollection of having had one at some point.

PIC32MX170F256D-50I/PT (MM2-44) at Digikey: $8.13, 0 in stock, Manufacturer Standard Lead Time 52 Weeks.

~
Edited 2022-01-15 02:17 by lizby
 
matherp
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Posted: 04:24pm 14 Jan 2022
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  Quote  Hmm, I don't see I2C SLAVE as a command in the Picomite manual, and I get this:


Missing in the command list but in Appendix B and see here. Syntax slightly different to MM2
 
Mixtel90

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Posted: 08:31pm 14 Jan 2022
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The result of today's playtime:
RS485 version. I had to lose the ICSP connector, but that's hardly a deal breaker as all the signals are on the IO connector. Only GP28 is left now. DE is under user control as the PicoMite doesn't appear to support an automatic mode. I2C at 3V3 is available on the IO connector. The odd arrangement of the RS485 connector allows for easy connection of two twisted pairs or a 4-core flat cable (only for short distances, I think, but might be useful). You can also do A+B+Gnd quite easily. I'm only thinking of a Dupont connector here as a controller should be in a box.




-- Mick

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flasherror
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Posted: 12:27am 15 Jan 2022
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Nice PCB.

A suggestion: move RS485 connector a little away from the micromite I/O connector, it looks kind of close.

Also, it doesn't look like there are mounting holes on right side (unless the regulator PCB hole is intended to be a mounting hole?) Or maybe this is designed to fit a box? Might need mechanical support if plugging/unplugging things into micromite connector?

I know you attach schematics, but can you upload .zip of them? Some of the text readability is not great considering large images are resized during upload.

Also, what are the SD card and RTC modules?
Edited 2022-01-15 10:31 by flasherror
 
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