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Forum Index : Microcontroller and PC projects : I'd decided that I wasn't going to do any more backpacks....

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6790
Posted: 05:50pm 14 Jan 2024
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But suddenly I was inspired. :)
Designed to fit a 3.2" ILI9341 with only a short distance between them. 5mm should be plenty. A PicoMite can be surface mounted too, which reduces the rear projection even more. As usual, there are options though. :)

It can be built without a display.
Seven QWIIC sockets can be fitted.
One size 1 and one size 2 Click locations are available.
There is a socket for a ESP8266-01S (replaces the Click 1 socket).
An expansion port is available, but only GP28 is on it as standard.
A YD-RP2040 can be used (plug-in only) in which case GPIO pins GP29 and GP23 are available and a RTC can be plugged into the expansion port.
The Click sockets have been arranged to have their own SPI so that it doesn't cause problems with the display. Each one also allows INT to be used as a second PWM channel.
There is a LM111& regulator that only feeds the display and all external connectors. The Pico switcher powers the PicoMite and a microSD card socket.







DISPLAY
Reset GP4 T_IRQ GP0
CS GP1 T_CS GP5 SD_CS        GP13
SCK GP10 T_SCK SD_SCK SPI2
MOSI GP11 T_DIN SD_MOSI SPI2
MISO GP12 T_DO SD_MISO SPI2
DC GP7
LED GP6

OPTION SYSTEM SPI GP10, GP11, GP12
OPTION LCDPANEL ILI9341, L, GP7, GP4, GP1, GP6
OPTION TOUCH GP5, GP0
OPTION SDCARD GP13

IF YD-RP2040 IS FITTED
OPTION PICO OFF
OPTION SYSTEM I2C GP28, GP29 'I2C
OPTION RTC AUTOENABLE 'IF RTC IS PLUGGED INTO K9


CLICK COMMON
Reset RUN
SCK GP18 SPI
MOSI GP19 SPI
MISO GP20 SPI
TX GP16 COM1
RX GP17 COM1
SDA GP2 I2C2
SCL GP3 I2C2

CLICK 1 CLICK2
CS GP21 CS GP22
AN GP27 ADC1 AN GP26 ADC0
PWM GP8 PWM4A PWM GP14 PWM7A
INT GP9 PWM4B INT GP15 PWM7B


QWIIC SOCKETS
SDA GP2 I2C2
SCL GP3 I2C2


EXPANSION PORT
IF YD-RP2040 IS FITTED IF STANDARD PICO IS FITTED
1 GND GND
2 GP23 (nc for RTC) 3V3EN
3 GP29 I2C_SCL ADC VREF
4 GP28 I2C_SDA GP28
5 3V3 3V23
6 RUN RUN
TINY RTC CAN ONLY BE FITTED WITH YD-RP2040


Edited 2024-01-15 03:52 by Mixtel90
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 4234
Posted: 09:38am 15 Jan 2024
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Hi Mick,

This looks like a very usefull board. I have only one remark.
The LM1117 is powerering all external sensors, so potentially it gets hot.
And the heat tab of the package is not connected to any copper surface.

There has been quite a lot of discussion going on about the ESP8266 modules, and what firmware to put in it.
In view of current developments, would suggesting the WebMite not be a better choice, and reserving the ESP8266 connections for a different module (YD40 ?).

Volhout
Edited 2024-01-15 19:42 by Volhout
PicomiteVGA PETSCII ROBOTS
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 6790
Posted: 10:42am 15 Jan 2024
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Heatsinking the LM1117T is a pain. Eventually I decided to put silicon on the back, which has no solder mask, then just solder it down and let the heat dissipate where it will. There is a bit of copper on the other side too. Otherwise you can have a hell of a job if you ever have to remove one. It needs serious heat from a big iron tip to get the tab off. I must admit that I've not tried this arrangement to see how effective it is. It wouldn't be too much hassle to create a better heatsink area.

There wouldn't be a lot of power dissipation. The regulator has 1.7V across it. That's about 1.4W at the full 800mA load.

A while ago I did a few designs for little com modules that all fit the ESP8266 socket. Any of these could be used. I did them for HC12, JDY-40 and RS485 (but the latter won't fit mechanically).
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2914
Posted: 10:46am 16 Jan 2024
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Hi Mick, All,

You could look at using one of these beasties,

Buck MODULE

I have ordered a couple to play with, I ‘think’ they are pretty small and look like the could be soldered vertically for space saving.

Regards,

Mick (The big one)



.
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
Frank N. Furter
Guru

Joined: 28/05/2012
Location: Germany
Posts: 830
Posted: 10:55am 16 Jan 2024
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Why don't you use AP63203WU-7? (https://de.farnell.com/diodes-inc/ap63203wu-7/dc-dc-wandler-sync-buck-1-1mhz/dp/3518307?ost=3518307)

A friend has successfully used it with a cheap 4.7µF on a ESP32?

Frank
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 6790
Posted: 11:00am 16 Jan 2024
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Those are very neat. I'll not bother at the moment though, I still have an outstanding 5-day guaranteed delivery order with AE that's now 15 days overdue! It's probably stuck on a container ship just outside the middle east area because it's (supposedly) left the warehouse. :(

@ Frank
First, I didn't know about them. Second, the postage charge from Farnell is almost £8 unless I spend about £50 before VAT and postage are added. Actually, the module suggested works out much cheaper and smaller by the time you've added the extra components, I suspect.
Edited 2024-01-16 21:07 by Mixtel90
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
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