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Forum Index : Microcontroller and PC projects : uMitePi

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MikeO
Senior Member

Joined: 11/09/2011
Location: Australia
Posts: 254
Posted: 07:10am 02 Nov 2021
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Just a quick post , after playing with Annex for quite some time I had forgotten how good mmbasic was and have used it for this latest project. Basically it is a Co processor for use with a raspberry pi , provides power control , shutdown / Restart for the pi , standby power is less than 10mA (could be uA if sleep was also employed) , pwm fan control. Communication with the Pi is via serial and  Node RED provides the interface. This also gives lots of scope to write routines in basic instead of scripts or Python on the Pi.






Codenquilts
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 1196
Posted: 07:39am 02 Nov 2021
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That's very neat, MikeO. :)
And a nice bit of shoehorn work to get everything in the box.  
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 952
Posted: 09:08am 02 Nov 2021
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Hi MikeO,

Nice IO board, solves some functions lacking in the pi.
Missing one thing though. The DS3132 RTC.....

And as Mixtel said....quit a squeeze to put it all in the small box...

Regards,

Volhout
If nothing goes right ... turn left
 
MikeO
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Joined: 11/09/2011
Location: Australia
Posts: 254
Posted: 11:06am 02 Nov 2021
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Its designed to go together, does it really need a RTC when its connected to the internet?
Codenquilts
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 1196
Posted: 11:20am 02 Nov 2021
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I like that case, it's tiny! Is it 3D printed?

Nope - internet time is close enough for me. lol
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
Plasmamac

Senior Member

Joined: 31/01/2019
Location: Germany
Posts: 189
Posted: 11:22am 02 Nov 2021
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Work together! Great
Plasma
 
MikeO
Senior Member

Joined: 11/09/2011
Location: Australia
Posts: 254
Posted: 12:11pm 02 Nov 2021
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Yes 3D printed, designed to take a Pi4 plus DC to DC power supply .
Codenquilts
 
Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 348
Posted: 08:44pm 03 Nov 2021
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Sweet. Looking at doing something similar to have sub I/O and ADC running in
 the background to the RPi main code. With small I2C display showing the
 170's I/O states and the ADC's real time values.
 
MikeO
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Joined: 11/09/2011
Location: Australia
Posts: 254
Posted: 06:11am 04 Nov 2021
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@Quazee137

Sounds like a excellent marriage! are you familiar with node-red for use on the Pi it is perfect for stitching the communications together.

Mike
Codenquilts
 
MikeO
Senior Member

Joined: 11/09/2011
Location: Australia
Posts: 254
Posted: 05:18am 24 Nov 2021
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V2 PCB now complete. Makes all unused mx170 pins available and adds a RTC connector.
This board makes all ADC pins available to the Raspberry Pi (via Node red suggested).





New enclosure


Long press of Button starts shutdown sequence, Pi Red power Led will go out when shutdown complete and RPI will be powered down. Standby current is ~ 6mA. Longpress again will restart the Raspberry Pi.

Micromite code
 '  ' ***** uMitePi *****
 ' *******************************
 '    Filename: uMitePi.bas
 '    Date: Aug 2021
 '    File Version:
 '     Written by: M.Ogden
 '    Function: uMitePi  "Hat" controller for Raspberry Pi
 '   Device: micromite mx170
 '    Last Revision:
 '    Initial v0.6
 '   MMBasic Ver 5.05.04 ,raspberry Pi running  Node Red
 'adds some LED indicators, Fan control and Shutdown signaling to RPI Zero-Pi4
 'plus mmBasic user code
 'V2 PCB adds access to all unused MX170 IO pins, adds RTC connector
 'V0.7 'release
 .v0.8 'add I/O changes for version 2 PCB
 
 
  ' *******************************
 'IO Pin List
 'D1 Led (Button)
 'D5 Button
 'D6 Sig pi-running
  'D8 Out shutdown-Pi
 'D9 Out pi-power
 'Pin 4 Fan Ctrl
 'Pin 6 Fan Ctrl  on v2 pcb
 option explicit
 dim integer D1=10,D5=16,D8=15,D6=18,D9=17  'mx170 IO pins V1 pcb
 'dim integer D1=10,D5=16,D8=15,D6=9,D9=14  'mx170 IO pins V2 pcb
 'Variables
 dim q$=chr$(34),J$="&",temp$="",lastline$,newline$
 dim integer start=0,lotemp=45,hitemp=60,midtemp=50
 'set lfan=0 if no low fan req'd
 dim integer lfan=0,mfan=60,hfan=75   'fan pwm speeds
 dim integer secs=0,flag=0 'periods
 dim integer uptime=0  'time up in seconds
 dim integer upspower=0  'ups power on
 dim integer upstime=0 'time on battery
 dim integer nolowfan=1  'if no low fan needed
 dim Integer userprocessflag
 'user variables
 dim integer pi.temp=50
 
 'LEDs & Outputs
 setpin d1, dout 'Led 1
 setpin D8, dout   'pi-shutdown
 setpin d9, dout 'pi-power
 pin(d9)=0 'take control of power supply On
 pin(d8)=1 'pi-shutdown not-shutdown
 pin(d1)=0 'Led(button) off
 'Inputs
 setpin D5, intl,buttonpress,PULLUP  'S2 Button
 setpin D6, din  'pi running
 
 'Run Fan High
 'for v2 pcb change format to PWM 1,,,100,hfan etc
 PWM 1,100,hfan  'Run fan high
 pause 3000  'run fan
 PWM 1,100,lfan 'Run fan low
 
 '*********************************************************************************
 
 'initialise
 
 'serial Com1
 open "com1:38400,,rec1" as #5
 settick 1000, T1,1  '1 sec timer
 'settick 60000,runonce,2
 
 'main loop processing
 do
   if pin(d6)=1 then
     led1 d1,25  'Pi & Co-Processor running
   else
     if uptime mod 15 = 0 then led1 d1,25  'Co-Processor only running , flash every 15secs
   endif
   Watchdog 20000 ' set the WDT at 20 secs
   'process data from RPI
   if userprocessflag=1 then
     UserProcess
     UserProcessFlag=0
   end if
   'run periodic tasks
   if uptime mod 30 = 0 then fanctrl
   pause 1000 'restrict loop to 1 second minimum
 loop
 
 
 'core routines
sub runonce
 settick 0,0,2 'disable timer
end sub
 
 'Heartbeat
sub T1
 uptime=uptime+1
end sub
 
 
 'Led1 pulse p=pin
sub led1(p,d)
 if d=0 then d=50
 pulse p,d
end sub
 
 'Led2 toggle
sub led2(p)
 if pin(p)=1 then
   pin(p)=0
 else
   pin(p)=1
 end if
end sub
 
 'Led3 set
sub led3(p,hl)
 pin(p)=hl
end sub
 
sub fanctrl
'for v2 pcb change format to PWM 1,,,100,hfan  etc
 if pi.temp=0 then then exit sub  'exit if no pi.temp
 if pi.temp>hitemp then
   PWM 1,100,hfan
 endif
 if pi.temp<midtemp then
   PWM 1,100,mfan
 endif
 if pi.temp<lotemp and nolowfan=0 then
   PWM 1,100,lfan
 endif
end sub
 
Sub rec1
 'reads bytes from comms buffer , data terminated by CR will output a NewLine$ and set the UserFlag
 'also checks for block data transmissions , start with SOH (Dec 1)
 local a$
 local integer p,l
 'print "Buffer:";loc(5)
 a$=Input$(20,#5)  'user supplied processing routine
   'print a$;
 on error skip
 lastline$=lastline$ + a$    'add to data packet
packet:
 l=len(lastline$)
 p=instr(lastline$,chr$(13))
 if p>0 then   'CR found so process
   Newline$=left$(Lastline$,p-1)
   if l>p+1 then
     lastline$=mid$(lastline$,p+1) 'save the rest of the line
   else
     lastline$=""
   end if
   UserProcessFlag=1  'set process data flag
   'print "newline:"+newline$
 endif
End Sub
 
 'process json strings from RPI
Sub userprocess
 'print newline$
 pi.temp=val(jsonvalue$(newline$,"pi-temp"))
 print pi.temp
end sub
 
sub buttonpress
 pause 50  'debounce
 if pin(d5)=0 then presstime
end sub
 
sub presstime
 pause 1000
 if pin(d5)=0 then
   if pin(d6)=1 then   'is pi running
     print "Shutdown"
     led3 d1,1
     pin(d8)=0  'shutdown RPI
     pause 1000
     pin(d8)=1
     pause 10000' Wait for pi to shutdown
     cpu 5
     led3 d1,0
     print "shutdown supply"
     pin(d9)=1  'shutdown power supply
   else
     print "Restart"
     cpu 48
     uptime=0
     pin(d9)=0  'power supply on
   end if
 else
   print "shortpress"
   
 end if
end sub
 
function jsonValue$(Jstring$,jParam$)
 local a,c,s$,d$,b,json$
 json$=jstring$
 s$=":"
 d$=","
 'locate parameter
 a=instr(JSON$,jparam$)
 'print "A is:";a
 json$=replace$(json$,chr$(34),"")  'strip quotes
 json$=replace$(json$,"}",",")  'replace closing curly brackets with comma
 if a>0 then 'retrieve value
   'look for separator :
   b=instr(a,json$,s$)
   if b>0 then
     'look for deliminator
     c=instr(b,JSON$,d$)
     if c>0 then
       jsonvalue$=mid$(JSON$,b+1,c-(b+1))
     endif
   endif
 endif
end function
 
 'replaceString$(string$, replaceWhat$, replaceWith$)
FUNCTION REPLACE$(R$, a$, b$)
 local integer i,j,c,d
 d=1
 REPLACE$=R$
 i = LEN(a$) : j = LEN(b$)
 do while INSTR(d,REPLACE$, a$) > 0
   c = INSTR(d,REPLACE$, a$)
   REPLACE$ = LEFT$(REPLACE$, c-1) + b$ + MID$(REPLACE$, c+i)
   d = c+j
 loop
END FUNCTION
 
 '**************** End Core routines and functions ********
 
 'user subs and tasks
 '*** User subs and other code here ***
 
 
 'End user subs and tasks

Codenquilts
 
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