Stamp Inputs

Archiver

Hello Everyone,

Application:
I'm using two stamp pins as inputs. When pin 0 is high and pin 1 is
high, I'm storing a 3. When pin 0 is high and pin 1 is low then I'm
storing a 1. When pin 0 is low and pin 1 is high, I'm storing a 2.

Problem:
Storing 3 works okay, but I'm getting unreliable results when
checking for 1 or a 2.

Hook-up:
I have a 22K resistor going to pin 0.
I have a diode going from ground to pin 0. (banded end to pin)
I have a SPST momentary switch also going to pin 0. (+5V)
(The same thing is duplicated for pin 1 above)
I have a diode going to the pin 0 circuit with and another diode
going to the pin 1 circuit, both diode with the non-banded ends
conncected to the thrid SPST momentary switch. This swith is also
connected to ground with a diode.

Successful When:
If I press the momemtary SPST switch on pin 0 without pressing the
other two switches, a '1' is registered...etc.
Pressing the thrid switch works great. The third switch makes pin 0
and pin 1 both high.

Question:
Is the probem in the code, or in the hook-up?

Code:
'I have tried many code variations, this is not the most efficient
but simply a desperate variation

INPUT 0
INPUT 1

DEBUG "START",CR
START:
'IF IN0=1 AND IN1=1 THEN THREE
IF IN0=1 THEN ONE
IF IN1=1 THEN TWO
'DEBUG "0",CR
GOTO START

ONE:
debug "At One",cr
IF IN1=1 THEN THREE
DEBUG "1",CR
hold1:IF IN0=1 THEN hold1
'PAUSE 1500
GOTO START


TWO:
debug "At Two",cr
IF IN0=1 THEN THREE
DEBUG "2",CR
hold2:IF IN1=1 THEN hold2
'PAUSE 1500
GOTO START

THREE:
debug "At Three",cr
DEBUG "3",CR
hold3:IF IN0=1 AND IN1=1 THEN hold3
'PAUSE 1500
GOTO START

Archiver

Your hookup is correct except for both diodes between pins and gnd, not
necessary.
Your program is a lot too complicated, see below.

Input 0
Input 1 'pins 0 and 1 are inputs
loop:
debug dec ? inA & 3 'display input for pins 0 and 1 only
pause 1500
goto loop

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Original Message

---

From: <Forbesits@y...>
To: <basicstamps@egroups.com>
Sent: jeudi 9 novembre 2000 18:57
Subject: [noparse][[/noparse]basicstamps] Stamp Inputs


> Hello Everyone,
>
> Application:
> I'm using two stamp pins as inputs. When pin 0 is high and pin 1 is
> high, I'm storing a 3. When pin 0 is high and pin 1 is low then I'm
> storing a 1. When pin 0 is low and pin 1 is high, I'm storing a 2.
>
> Problem:
> Storing 3 works okay, but I'm getting unreliable results when
> checking for 1 or a 2.
>
> Hook-up:
> I have a 22K resistor going to pin 0.
> I have a diode going from ground to pin 0. (banded end to pin)
> I have a SPST momentary switch also going to pin 0. (+5V)
> (The same thing is duplicated for pin 1 above)
> I have a diode going to the pin 0 circuit with and another diode
> going to the pin 1 circuit, both diode with the non-banded ends
> conncected to the thrid SPST momentary switch. This swith is also
> connected to ground with a diode.
>
> Successful When:
> If I press the momemtary SPST switch on pin 0 without pressing the
> other two switches, a '1' is registered...etc.
> Pressing the thrid switch works great. The third switch makes pin 0
> and pin 1 both high.
>
> Question:
> Is the probem in the code, or in the hook-up?
>
> Code:
> 'I have tried many code variations, this is not the most efficient
> but simply a desperate variation
>
> INPUT 0
> INPUT 1
>
> DEBUG "START",CR
> START:
> 'IF IN0=1 AND IN1=1 THEN THREE
> IF IN0=1 THEN ONE
> IF IN1=1 THEN TWO
> 'DEBUG "0",CR
> GOTO START
>
> ONE:
> debug "At One",cr
> IF IN1=1 THEN THREE
> DEBUG "1",CR
> hold1:IF IN0=1 THEN hold1
> 'PAUSE 1500
> GOTO START
>
>
> TWO:
> debug "At Two",cr
> IF IN0=1 THEN THREE
> DEBUG "2",CR
> hold2:IF IN1=1 THEN hold2
> 'PAUSE 1500
> GOTO START
>
> THREE:
> debug "At Three",cr
> DEBUG "3",CR
> hold3:IF IN0=1 AND IN1=1 THEN hold3
> 'PAUSE 1500
> GOTO START
>
>
>
>
>
>
>
>