How to use BSII Off board of education
crazym0nkey
Posts: 2
Hello all,
I'm working on a project using the BSII.· The problem is that I want to use the BSII off of the board of education.
First I placed the BSII on the breadboard of the board of education.· I connected the "Vin" pin of the stamp to the Vin source and the "Vss" pin to the "Vss" on the board of education.· The code loaded onto the stamp is to simply sweep a servo back and forth in a 180 degree motion smoothly.
The code written works perfectly fine when the BSII is placed on the board of education.· But when the BSII is placed on the breadboard, the code does not work the same.· When the switch is turned to position one, this powers up the stamp and the code works for a moment but then the servo starts to jitter back and forth and does not make the complete 180 that it is supposed to.· When the switch is put to position two, the servo goes directly to the jitter motion.
To get the BSII working correctly off of the board of education, the stamp needs only power Vin and ground Vss correct?· Or do more connections to the stamp need to be made?
The servo is getting enough power.· Its just that the pin that is pulsing to the servo that is not acting correctly.· I used an oscillascope to monitor the pin that pulses to the servo and when the stamp is OFF of the board of education, the pulse does not smoothy increase and decrease causing the servo to jitter.· So I am led to believe that the problem is not with the servo, but with the stamp being off of the board of education.
It just seems that the BSII just doesn't want to perform the task correctly that was programmed to it when it is off of the board of education.· Also once I place the stamp back onto the board of education, it works perfectly fine without having to reprogram the stamp.
Could anyone shed some light on this problem?· Thanks.
I'm working on a project using the BSII.· The problem is that I want to use the BSII off of the board of education.
First I placed the BSII on the breadboard of the board of education.· I connected the "Vin" pin of the stamp to the Vin source and the "Vss" pin to the "Vss" on the board of education.· The code loaded onto the stamp is to simply sweep a servo back and forth in a 180 degree motion smoothly.
The code written works perfectly fine when the BSII is placed on the board of education.· But when the BSII is placed on the breadboard, the code does not work the same.· When the switch is turned to position one, this powers up the stamp and the code works for a moment but then the servo starts to jitter back and forth and does not make the complete 180 that it is supposed to.· When the switch is put to position two, the servo goes directly to the jitter motion.
To get the BSII working correctly off of the board of education, the stamp needs only power Vin and ground Vss correct?· Or do more connections to the stamp need to be made?
The servo is getting enough power.· Its just that the pin that is pulsing to the servo that is not acting correctly.· I used an oscillascope to monitor the pin that pulses to the servo and when the stamp is OFF of the board of education, the pulse does not smoothy increase and decrease causing the servo to jitter.· So I am led to believe that the problem is not with the servo, but with the stamp being off of the board of education.
It just seems that the BSII just doesn't want to perform the task correctly that was programmed to it when it is off of the board of education.· Also once I place the stamp back onto the board of education, it works perfectly fine without having to reprogram the stamp.
Could anyone shed some light on this problem?· Thanks.
Comments
Is it battery powered? If so, change the battery used in the off board situation. You should really power servos with something other than a battery, if this is the case.
Regards,
Bruce Bates
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Involvement and committment can be best understood by looking at a plate of ham and eggs. The chicken was involved, but the pig was committed. ANON
The kit comes with servos and to setup the Boe-bot, the servos run off the same batteries. The board of education does have "Vin" and "Vdd." When using a multimeter, the "Vin" outputs 5.5V and "Vdd" outputs 5V. The servos are connected to "Vdd" and the stamp is powered by "Vin."
When I place the stamp on a breadboard (the small one on the board of education) off of the board of education, I power "Vin" pin of the stamp with Vin. For servo, the power is given by "Vdd."
Actually, now when I looking at the board of education schematic, I see that the X4-A, X4-B, X5-A, X5-B are the ports which the servos are connected to are powered by "Vsvo."
The schematic that I am looking at is: http://www.parallax.com/Portals/0/Downloads/docs/prod/boards/BoeUSBrevB.pdf
What is Vsvo?
While writing this response, I have just tested with an oscillascope that the BSII outputs correctly while off the board of education. It starts outputting the jittery signal when the servo is connect. Now after looking at the routing lines, I believe that you are correct that they are not the exact same source.
So now the question is that I have no idea what Vsvo is and how would I generate that source?
Thanks for your help.