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Interactive 2
This is an explanation of the code for the flow control I came up with it to get my Basic Stamp 2(BS2) talking to my Basic Stamp 1(BS1). I am showing the main loops only. For the code files look at letsmakerobots.com and here. Files or a zip file.

In my code I use a lot of Bit flags. Most processors allow access to the Bits of a Byte or Word to use like regular variables. Basic Stamp 1 and most Picaxe processors have defined variable names for the Bits of first few bytes of memory. Usually it is Bit0 – Bit7 or Bit0 – B15 or Bit0 – Bit31 to define a variable. In both of these processors the variable Bits can also be in another variable. Like my lights Byte B0 the Bits are the variables Bit0 – 7 that are lit1 – lit8 the individual lights. This makes testing of a light easy. “If lit1 = 1 then litOn” is simple.

The Basic Stamp 2 and processors like it use defined subscripting to access the Bits, Nibbles and Bytes of a variable. My individual lights are the variables “lights.Bit0 - Bit7”. In testing a variable Bit is “if lghts.Bit0 = 1 then litOn”. Setting is “litTmp = lights.Bit0”. Usually the subscripts can not be a variable. Look at the program files in the EasyLights article. Read your manual.

I fixed as much as I could. The BS1 doesn’t do serial out very well. It is stable and runs like any simple button on a system like this. The BS1 doesn’t do Bits very well either.

My flow control is the only way I got these systems to communicate.

My text comments will be // in this article. In Basic Stamp code the ' is a comment.

//Basic Stamp 2 code fragment.
jp6:
  'Basic Stamp 1 Project board(BS1Pj1)
  'Incomming message
  slv1In = 0
  LOW sTx 'Message Acknowledge
  PAUSE 6
//Lead in Pause
  SERIN slvRx, 396, 350, err1, [slv1Stat, tmp1]
//Serial error time to wait and error handler
  PAUSE 3
  HIGH sTx
  'The BS1 doesn't do serial very well.
  IF slv1Stat = 10 THEN jp7
  IF slv1Stat = 20 THEN jp9
//I get nothing but errors ??????
  errSlv1 = 0
  slv1btn2 = 0
  GOTO jp2
err1:
  DEBUG "Error Stat ", DEC slv1Stat, ",  B", BIN slv1Stat, CR
  DEBUG "Error tmp", DEC tmp1, ",  B", BIN tmp1, CR
  IF slv1Stat = 10 THEN jp7
  IF slv1Stat = 20 THEN jp9
  errSlv1 = 1
  slv1btn2 = 0
  GOTO jp2
jp9:
  'Work in progress
  DEBUG "Btn2 ", DEC slv1Stat, ",  B", BIN slv1Stat, CR
  slv1btn2 = 1
  GOTO jp2
jp7:
  binSet = 1
  ranSet = 1
  larset = 1
  rMode = rMode + 1
  IF rMode < 4 THEN jp2
  rMode = 1

  'Transmit Section
jp2:
  IF sRx = 0 THEN slv1In = 1 'Checks for messages
  IF pRx = 0 THEN mstIN = 1 'Checks for messages
  IF litSet = 1 THEN jp3
  IF mastSet = 1 THEN jp4

'BS1Pj1 can only get hit 1 in 10 times
  cnt2 = cnt2 + 1
  IF sRx = 0 THEN slv1In = 1
  IF cnt2 < 10 THEN jp1
  cnt2 = 1

  'Control for EasyLights on BS2Pj1
jp4:
  SELECT rMode
    CASE 1
      GOSUB doLarson
    CASE 2
      GOSUB doBinNum
    CASE 3
      GOSUB doRandom
  ENDSELECT

  'Send the lights byte to BS1Pj1 for display
  LOW lit1
  LOW sTx 'Signals Message Ready
  PAUSE 80 'For BS1Pj1
  SEROUT slvTx, 396, [BS1Pj1, lights]
  PAUSE 40
  HIGH sTx
  HIGH lit1
  litSet = 1
……………………………………………
Basic Stamp 1 code
runIt: 'Buttons one at a time
  IF BS1Stat > 0 THEN run2
  IF pBtn1 = 0 THEN bt2
  BS1Stat = 10
  GOTO bt3
bt2:
  IF pBtn2 = 0 THEN run2
  BS1Stat = 20
bt3:
tmp1 = 66
  pTx = litOff
run1: 'Send button message
  PAUSE 1 'Wait for master to lower its Tx
  IF pRx = 1 THEN run1
  SEROUT pinTx, T2400, (tmp1, BS1Stat)
  PAUSE 1
  pTx = litOn
  GOTO jp1
run2:
  IF pRx = 1 THEN jp1 'Check for message
  SERIN pinRx, T2400, mCmd, tmp1
  PAUSE 3
  IF mCmd <> BS1Pj1 THEN jp1 'Check for correct address
  lights = tmp1
  'Do lights onto EasyLights
is this for controlling a 12v fan speed
I fixed it as best I could. It works and it is stable.
This code is unstable and buggy. I am going to delete this article and put up a new one. I was excited that it worked. As soon as I fixed one thing the whole system crashed.

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Bio: I have always been a geek and I see things differently than most people. I am healthy too and I love biology. Programming has always ... More »
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