ESP32 S2Mini

[cicciocb]

Ok, thanks. I had been dividing down my actual voltage (18.8V DC) with a margin, so 21V to 3.3. So instead, I need to divide down to 2.5V.

Are the attenuation options settable from Annex? (E.g., ADC_ATTEN_DB_11--which seems to be in effect for my S2Mini)

No, the attenuation is not settable and is fixed to the max range.

[lyizb]

It's now working as expected, other than that it is maxing out at 2.62V (on my voltmeter) with an ADC reading of 8191 (while at 2.6V the reading is 8161.

Of course, there's no guarantee that my voltmeter is accurate to a tenth of a volt.

I still have to calibrate to my voltage reading before the voltage divider 100K-o-12K, but I'm close to within a couple of tenths of a volt, which is more than good enough for my purposes.

Thanks very much.

[lyizb]

Another PCB for the ESP32-S2Mini. This is for the outer rows of pins, which means it will also work for an ESP8266-D1Mini and on the inner rows of pins on an ESP32-D1Mini.

S2Mini outer pins PCB V2.jpg

and fully populated: pin 39--DS18B20; 37--DS18B20; 35 I2C-scl; 33 I2C-sda (OLED); 16, 18, 11, 12--relay module; 3,5,7,9--LED module:

S2Mini outer pins PCB V2 populated.jpg

Here's a better (if blurry) view of the OLED:

S2Mini outer pins PCB V2 OLED.jpg

Here's a youtube video of the board with 5V LEDs, 12V LEDs, DS18B20s, and 128x64 OLED: https://youtu.be/WSGGTyC6Vwc

Here's the program I used to exercise the PCB in the video:

Code: [Local Link Removed for Guests]

' t1,bas
dim LEDstatus$(2)=" OFF"," ON "
dim pLED(4)=3,5,7,9
dim p12V(4)=16,18,12,11
for i=0 to 3
  pin.mode p12V(i),output
  pin.mode pLED(i),output
next i
dim pTmpr(4)=39,37,35,33
dim tmpr$(4)
gosub pinset
flagI2C=0
k=0
gosub setI2c
print "before DO",millis

do
  for i=0 to 3
    if i=0 or i=1 then
      tmpr$(i)=tempr$(pTmpr(i),1)
      if tmpr$(i)<>"-127" and tmpr$(i)<>"85" then
        ln$="Temp"+str$(i+1)+": "+str$(val(tmpr$(i)),"%3.1f")
      else
        ln$="Line "+str$(i+1)
      endif 
    else
      ln$="Line "+str$(i+1)
    endif 
    if flagI2c then ' or <>
      k=int(rnd(2))
      pin(p12V(i))=k
      pin(pLED(i))=1-k
      ln$=ln$+" pin "+str$(p12V(i))+LEDstatus$(k)
'    else
'      t1=millis/1000
      oled.print 0,i*16,ln$
'      t2=millis/1000
'      wlog "Lapsed time print: ",i,t1,t2,"lapsed: ",t2-t1," seconds"
    endif 
    wlog i+1,ln$,k
    pause 1000
'    print "before NEXT",i,millis
  next i
'  gosub pinset
  pause 2000
'  t1=millis/1000
  if flagI2C then
    oled.cls
  endif
'  t2=millis/1000
'  wlog "Lapsed time cls: "," ",t1,t2,"lapsed: ",t2-t1," seconds"
  pause 500
loop

pinset:
  print "pinset",millis
  for i=0 to 3
    pin(p12V(i))=1
    pin(pLED(i))=1 ' pin(5)=1: pin(7)=1: pin(9)=1
    pause 500
  next
  for i=0 to 3
    pin(p12V(i))=0
    pin(pLED(i))=0 ' pin(5)=1: pin(7)=1: pin(9)=1
  next
  return

setI2c:
  i2c.setup 33,35 ' 18,16 ' SDA,scl
  OLED.INIT 1 ',1 ' 0=normal orientation (,1->1.3" SH1106)
  OLED.CLS ' clear the screen
  OLED.FONT 1 '1=10pixels,2-16,3=24
  OLED.COLOR 1
  for i=0 to 3
    OLED.PRINT 0,i*16,"Line "+str$(i+1)
    pause 500
  next
  OLED.CLS ' clear the screen
  flagI2C=1
  return

Attached are the gerbers for ordering from JLCPCB. They're for V3. I fixed a spot where I had to gouge out a trace which had wandered without my noticing it, added a pin hole to make it easier to add an I2C port when the relay port is in use, and added some more labels.

When soldering pins to the S2Mini, I used a long pin in the 3V3 hole. That's to provide power to another PCB which will use the inner rows of pins. Coming soon.

[lyizb]

Inner pins PCB for ESP32-S2Mini:

image.png

The data pins are in the centers--long pin female headers are used to connect to the S2Mini. A single long pin female header is soldered in for the 3V3 pin (which is in the outer rows). A 0V pin is included on an inner row. I used headers with red plastic for the 3V3 rows of pins, with black for 0V. This makes it easier to avoid plugging modules in with the wrong orientation.

Here's the Christmas tree, with the "outer pins" PCB below the ESP32-S2Mini, and the "inner pins" PCB above. An 8-LED module is plugged into pins 1,2,4,6,8,10,13,14. In the other row, pin 40 is an 8-LED WS2814B; pin 38 is PWMing a 12V-24V 48-LED automotive interior light (at 12V in this case), pin 36 has a 5V beeper connected, pin 34 has a servo, pin 21 has a touch input sensor, and pin 17 has a 3-pin single LED module (green).

S2Mini inner pins PCB V2 populated.jpg

Here is a youtube video showing all of these pins in action (touching the touch sensor activated the beeper): https://youtu.be/Y_kDpWoE0Q0

The program has some residual code operating the pins on the outer PCB module (shown in a post above), but for the most part they don't have anything connected. After initializations, the main code is run in a 500ms timer routine ("timertick") (all the code between WAIT and the timertick sub is not executed).

Code: [Local Link Removed for Guests]

' t2.bas
dim c(8)=neo.rgb(0,0,0),neo.rgb(0,0,255),neo.rgb(0,255,0),neo.rgb(0,255,255),neo.rgb(255,0,0),neo.rgb(255,0,255),neo.rgb(255,255,0),neo.rgb(255,255,255)
dim LEDstatus$(2)=" OFF"," ON "
dim pLED(8)=14,13,10,8,6,4,2,1
dim pLED2(6)=3,5,7,9,11,12
dim p12V(4)=16,18,12,11
nLEDs=8
n12VLEDs=3
nLED2s=4
p1LED=17
pin.mode p1LED,output
pTouch=21
pin.mode pTouch,input
touchVal=0 ' off
for i=0 to n12VLEDs-1
  pin.mode p12V(i),output
next i
for i=0 to nLED2s-1
  pin.mode pLED2(i),output
next i
for i=0 to nLEDs-1
  pin.mode pLED(i),output
next i
pBeeper=36
pin.mode pBeeper,output
pWS2812A=40 ' neo
servopos=350
servosign=1 ' 1=forware, 0-reverse
PWM.SETUP 34, 2, 350, 50, 12 ' servo--swing between 150,350,550
PWM.SETUP 38, 1, 1 ' pin 38, ch 1, value 1 ' ramp 12V LED
NEO.SETUP pWS2812A,9 ' pin 40, 8 LEDs
dim pTmpr(4)=39,37,35,33
dim tmpr$(4)
'do
'  gosub pinset
'loop
flagI2C=0
k=0
gosub setI2c
timer0 500,timertick
nTicks=0
' print "before DO",millis
wait

do
  for i=0 to 3
    if i=0 or i=1 then
      tmpr$(i)=tempr$(pTmpr(i),1)
      if tmpr$(i)<>"-127" and tmpr$(i)<>"85" then
        ln$="Temp"+str$(i+1)+": "+str$(val(tmpr$(i)),"%3.1f")
      else
        ln$="Line "+str$(i+1)
      endif 
    else
      ln$="Line "+str$(i+1)
    endif 
    if flagI2c then ' or <>
      k=int(rnd(2))
      pin(p12V(i))=k
      pin(pLED(i))=1-k
      ln$=ln$+" pin "+str$(p12V(i))+LEDstatus$(k)
'    else
'      t1=millis/1000
      oled.print 0,i*16,ln$
'      t2=millis/1000
'      wlog "Lapsed time print: ",i,t1,t2,"lapsed: ",t2-t1," seconds"
    endif 
    wlog i+1,ln$,k
    pause 1000
'    print "before NEXT",i,millis
  next i
'  gosub pinset
  pause 2000
'  t1=millis/1000
  if flagI2C then
    oled.cls
  endif
'  t2=millis/1000
'  wlog "Lapsed time cls: "," ",t1,t2,"lapsed: ",t2-t1," seconds"
  pause 500
loop

pinset:
  print "pinset",millis
'  pin(pBeeper)=1 ' beeper
  k=1
  for i=0 to 5
    if i<4 then
      pin(p12V(i))=1-pin(p12V(i))
    endif
    pin(pLED(i))=1 ' pin(5)=1: pin(7)=1: pin(9)=1
    pwm.out 1,k
    pause 250
    k=k+1
    pwm.out 1,k
    pause 250
  next
  pwm.out 1,0
  pin(pBeeper)=0 ' beeper off
  for i=0 to 5
'    pin(p12V(i))=0
    pin(pLED(i))=0 ' pin(5)=1: pin(7)=1: pin(9)=1
  next
  pause 1000
  return

setI2c:
  i2c.setup 33,35 ' 18,16 ' SDA,scl
  OLED.INIT 1 ',1 ' 0=normal orientation (,1->1.3" SH1106)
  OLED.CLS ' clear the screen
  OLED.FONT 1 '1=10pixels,2-16,3=24
  OLED.COLOR 1
  for i=0 to 3
    OLED.PRINT 0,i*16,"Line "+str$(i+1)
    pause 500
  next
  OLED.CLS ' clear the screen
  flagI2C=1
  return

timertick:
  if nTicks=0 then
'    pin(pBeeper)=1-pin(pBeeper)
    for l_j=0 to 7
      neo.pixel l_j,c(0) ' turn off
    next
    pin(p1LED)=1-pin(p1LED)
  endif
  if pin(pTouch)<>touchval then
    touchval=1-touchval ' toggle
    pin(pBeeper)=1-pin(pBeeper) ' turn beeper on or off
  endif
  l_i=0
  l_p=rnd(8)
  l_clr=rnd(8)
'  wlog nTicks,l_i,l_p, l_clr, c(l_clr)
  neo.pixel l_p,c(l_clr)
  pwm.out 1,nTicks '*31
  pin(pLED(nTicks))=1-pin(pLED(nTicks)) ' toggle
  if nTicks<nLED2s then
    pin(pLED2(nTicks))=1-pin(pLED2(nTicks)) ' toggle
  endif
  if servosign=1 then
    servopos=servopos+30
    if servopos>520 then
      servosign=0
      servopos=520
    endif
  else
    servopos=servopos-30
    if servopos<150 then
      servosign=1
      servopos=180
    endif
  endif
  pwm.out 2,servopos
  nTicks=(nTicks+1) MOD 8
  return

Gerbers are here:

ESP32_S2Mini-Inner-Pins_V3 Gerbers.zip

[cicciocb]

Thanks Lizby for sharing your "crazy" project

[Helmut_number_one]

I use a self routed PCB (made in China) for my ESP C3 project, AC/DC converter is on one side, ESP on the other side.

C3 Platine.png

C3 Platine3D.png