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Forum Index : Microcontroller and PC projects : PicoMite-ExpMini

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lizby
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Joined: 17/05/2016
Location: United States
Posts: 3152
Posted: 01:31pm 22 Apr 2023
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jaybec's post in the "I have a dream" thread gave me an idea: Phone, cable, pico, and -- the missing ingredient -- Terminal app The "ask"
The cell phone terminal app--USBTerminal--that he suggested works well--available on Google Play.

He included "breadboard", but I thought, why not a PCB which is little larger than the Pico itself? So I wired up a perfboard example:


Here is the layout:

                              G           G                                   + -
                              P   USB     P                                   V V
                RGB Blue  1 | 0     5VUSB | 40 VBUS                         5 o o
               RGB Green  2 | 1        5V | 39 VSYS                         6 o o
                     GND  3 |             | 38 GND                          7 o o
                 RGB Red  4 | 2           | 37 3V3_EN                       9 o o
                          5 | 3           | 36 3V3(out)                    10 o o
                          6 | 4 PicoMite  | 35 ADC_VREF                    11 o o
                          7 | 5  Exp- A28 | 34 Traffic Light Green         34 o o
                     GND  8 |    Mini     | 33 GND/ADCGND                  12 o o 34
                          9 | 6       A27 | 32 Traffic Light Yellow        32 o o
                         10 | 7       A26 | 31 LDR                         14 o o 32
                         11 | 8           | 30 RUN                         31 o o
                  WS2812 12 | 9        22 | 29 Buzzer                      29 o o 31
                     GND 13 |             | 28 GND                         27 o o
              Pushbutton 14 | 10       21 | 27                             15 o o
                         15 | 11       20 | 26                             26 o o
                RG_Green 16 | 12       19 | 25                             25 o o
                  RG_Red 17 | 13       18 | 24 SCK                         16 o o
                     GND 18 |             | 23 GND                         24 o o
      128x64 I2C LCD SDA 19 | 14       17 | 22 DHT11                       17 o o
                     SCL 20 | 15       16 | 21 Traffic Light Red           22 o o 21


The columns at the right represent 3 columns of headers placed underneath the PicoMite. In conformity with many of the sensors/switchs in the 37-in-1 kits, 3V3 is the center column, with 0V and signal on either side. The three ADC pins also appear outboard of 0V, also following the 37-in-1 convention. In addition, I wired for a 128x64 I2C display at the bottom, and a rotary encoder at the top (which, with the addition of another 0V pin also allows a 4-pin RGB LED).

I didn't wire all the pins on the perfboard, because it was very fiddly, but the sensors shown are wired.

Here's a (poor quality) 2-minute youtube video of the board being exercised--run off of a cell phone using USBTerminal: PicoMite-ExpMini

I made a PCB--a couple of hours work in EasyEDA (no schematic--because it is simple, I drew it straight to the PCB):


Gerbers * are here--$6.62 for 5 from JLCPCB with slow boat shipping:
PicoMite-ExpMini_2023-04-21_Gerber.zip

Here's the code for this example:
' PicoMite-ExpMini.bas; I2C LCD: OPTION SYSTEM I2C 19,20 OPTION LCDPANEL SSD1306I2C, LANDSCAPE

option explicit
dim integer i,j,k,l,m,n,iCol,iRow,x,y,iLastSW
dim integer fH,fW,iFont,nChRow,nRows,nCols
dim string a,c,e,f,g,h,s,lastSecond$
dim float fLDR,fTMP,fHUM,fLastLDR,fLastHUM,fLastTMP
Dim integer d%(15),b%(14)=(RGB(red),RGB(green),RGB(blue),0,0,0,0,0,0,0,0,0,0,0,0)
b%(3)=RGB(Yellow): b%(4)=RGB(cyan)
b%(5)=RGB(gold): b%(6)=RGB(magenta): b%(7)=RGB(brown): b%(8)=RGB(pink)
b%(9)=RGB(salmon): b%(10)=RGB(orange):b%(11)=RGB(grey):b%(12)=RGB(white)
b%(13)=RGB(lightgrey): b%(14)=RGB(beige)
const false=0
const true=1

const pRGB_B=1,pRGB_G=2,pRGB_R=4,pWS2812=12,pPushbutton=14,pRG_G=16,pRG_R=17
const pTraff_R=21,pDHT11=22,pBuzzer=29,pLDR=31,pTraff_Y=32,pTraff_G=34

setpin pPushbutton,DIN,pullup: setpin pLDR,AIN
setpin pTraff_R,DOUT:setpin pTraff_G,DOUT:setpin pTraff_Y,DOUT
setpin pRGB_B,DOUT: setpin pRGB_G,DOUT: setpin pRGB_R,DOUT
setpin pRG_G,DOUT: setpin pRG_R,DOUT: setpin pBuzzer,DOUT

fH=mm.fontheight: fW=mm.fontwidth
nChRow=mm.hres/fW: nRows=mm.vres/fH
cls
text 0,0,"PicoMite-ExpMini"

do
 bitbang humid pDHT11,fTMP,fHUM,1 ' 1 for DHT11
 if fLastTMP<>fTMP then
   text 2,fH*1,"Temp: "+str$(fTMP,2,1)
   fLastTMP=fTMP
 endif
 if fLastHUM<>fHUM then
   text 2,fH*2,"Humidity: "+str$(fHUM,2,1)
   fLastHUM=fHUM
 endif
 fLDR=pin(pLDR)
 if fLastLDR<>fLDR then
   text 2,fH*3,"LDR: "+str$(fLDR,1,3)
   fLastLDR=fLDR
 endif
 i=pin(pPushbutton) ' 0 is depressed
 if iLastSW<>i then
   iLastSW=i
   if i then a="OFF" else a="ON "
   text 2,fH*4,"Pushbutton: "+a
 endif
 if iLastSW=0 then: pin(pBuzzer)=1-pin(pBuzzer)
 else: pin(pBuzzer)=0: endif ' toggle buzzer
 i=int(rnd*3)
 select case i
   case 0: pin(pTraff_R)=1-pin(pTraff_R)
   case 1: pin(pTraff_G)=1-pin(pTraff_G)
   case 2: pin(pTraff_Y)=1-pin(pTraff_Y)
 end select
 i=int(rnd*3)
 select case i
   case 0: pin(pRGB_R)=1-pin(pRGB_R)
   case 1: pin(pRGB_G)=1-pin(pRGB_G)
   case 2: pin(pRGB_B)=1-pin(pRGB_B)
 end select
 i=int(rnd*2)
 select case i
   case 0: pin(pRG_R)=1-pin(pRG_R)
   case 1: pin(pRG_G)=1-pin(pRG_G)
 end select
 For i=0 To 15: j=Int(Rnd*14): d%(i)=b%(j): Next i ' random colors
 Bitbang ws2812 B,pWS2812,6,d%()
 pause 1000
loop
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
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