Two BS Development boards sharing same supply

faisal

Hi all,

I am trying to make to bs2's to work together.· Currently they are connected like this: vdd of one board to vdd of the other board, vss of one board to vss of the other board, Pin 8 of one board to Pin 8 of the other board and one of the boards has power supplied to it.· All connections are done with just wires.

I am trying to make pin 8 high on one of the boards and need the other board to recognise this as 5 Volts, I thought that it would recognise it as 5 V but when I used a Voltmeter to measure the voltage beteween pin 8 and Vss it turns out to be 0.6 Volts.

Any ideas What im doing wrong? Or any suggestions?

Thanks in advance.

Cheers

Beau Schwabe

faisal,

One quick recommendation.... use a current limiting resistor of 1K or so between the two stamp pins just in case you accidentally make them both outputs and their HIGH/LOW states do not agree with one another.

How are you making the pin HIGH?
HIGH 8

What are you doing on the "other" stamp, and is it connected during this test?

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

LoopyByteloose

Read up on BasicStamp I/O..
You have three options each on the two devices - High, Low, and High Impedance. Also, one device has to clearly be the Sender of Highs and Lows while the other is the Receiver in a High Impedance state. Both have to be in a programed loop to monitor the pin and then report sucess or failure. Things don't automatically get sent or received without a loop set up to do so.

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PLEASE CONSIDER the following:

Do you want a quickly operational black box solution or the knowledge included therein?······

···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

faisal

Hi Guys,

Thanks for the help.

Just one more question.· How do i put a pin into High impedance mode?

Beau Schwabe

faisal,

Making it an INPUT will do that.

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

faisal

Thanks Beau.

If on one stamp I have INPUT 8 and on the other stamp I have HIGH 8 and pin 8 on the first stamp is connected to pin 8 on the other stamp, then will the first stamp with INPUT 8 recognise the high from the second stamp?

Regards

Faisal