Basic Stamp 2 power supply
Hello,
I am trying to connect up·a basic stamp 2·on a breadboard and i was wondering about the connections from the supply?
Do i connect the·V- (from the supply)·to the·Vss (pin 23·on the Stamp)·and the V+ (from the supply)·to the·Vin (pin 24·on the Stamp)·or does V+ connect to the·Vdd (pin 21·on the Stamp)?
The Supply is a Regulated Power supply set to 4.5V
I have already blown 1 stamp by connecting V+ to pin 24 and V- to pin 23. Does anyone know the correct way of connecting a bs2 to a power supply.
Kind Regards
Shaun
I am trying to connect up·a basic stamp 2·on a breadboard and i was wondering about the connections from the supply?
Do i connect the·V- (from the supply)·to the·Vss (pin 23·on the Stamp)·and the V+ (from the supply)·to the·Vin (pin 24·on the Stamp)·or does V+ connect to the·Vdd (pin 21·on the Stamp)?
The Supply is a Regulated Power supply set to 4.5V
I have already blown 1 stamp by connecting V+ to pin 24 and V- to pin 23. Does anyone know the correct way of connecting a bs2 to a power supply.
Kind Regards
Shaun
Comments
Dave
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Dave Andreae
Parallax Tech Support·
If i had the 4.5V input connected to the Vin pin would that be able to blow the stamp, as that is what happened when i first tried this.
Regards
Shaun
It shouldn't unless the polarity was backwards.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
If you have a 100% clean supply that is EXACTLY 5 volts, you can put it directly to VDD (I often run from one BOE to another using this).
However, unless your sure about the power, you should connect it to VIN so the stamp's internal regulator can clean it up.
Unfortunately, all regulators "use up" some power on their own. This means that in order to get +5 volts, you need a supply higher than +5.
It doesn't have to be clean, however, because the regulator will do that for you.
Also remember that anything over the absolute min required for the regulator to function, is transformed into heat. So assuming the regulator
has a 1 volt internal drop (the power it uses up to run), a 6 volt supply would be ideal.
Anything higher has to be burned off as heat. This isn't always a bad thing, just keep it in mind... I personally wouldn't put anything higher than
9 volts on the stamp's internal regulator but Dave Andreae knows more than me so I guess 12volts is fine [noparse]:)[/noparse]
The best bet for what to do is the same thing the BOE does, it uses an external regulator to clean up the power before sending it to VDD. This
ensures that the power is absolutely clean and it keeps the Stamp from having to deal with any excess heat.
Can you define "blown"? Perhaps the damaged stamp is repairable.
Regards
Shaun
Dave
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Dave Andreae
Parallax Tech Support·
have you ever porgramed a BS on this PDB with your connections ?? or this is something to be checked ?
Can you apply something like 6V to the vin .. and check the voltage on the Vdd ( it should be 5V , this way you will know that the stamp regulator is ok )
Hope to help
Amaral
No Basic Stamps Found. Am I supposed to use the jumper wires
to complete the assembly of my sumo bot? I do have fresh batteries
that are attached to the robot. What am I doing wrong? Haaalllppp!
Barbz
Thanks,
Dave
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Dave Andreae
Parallax Tech Support
Post Edited (Dave Andreae (Parallax)) : 2/3/2009 11:39:52 PM GMT
Attached below is the circuit diagram for how i connected this circuit, the motor wires are connected to the ULN2003A correctly as i have had this circuit working using my professional development board.
I don't know why the stamp has blown but i hope someone can help me.
Regards
Shaun
Dave
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Dave Andreae
Parallax Tech Support·