bs1 schematic: BUILDING MY OWN BS1, NEED HELP

Blackbird455

I GOT THE SCHEMATIC FROM PARRALAX , BUT I DO NOT KNOW WHAT ALL OF THE SYMBOLS ARE, CAN ANYONE HELP ME?
I JUST GOT ALL OF MY COMPONENTS IN , AND MY IRON IS HOT, WHAT THE HECK ARE THOSE BLUE SYMBOLS ON THE BS1 OEM SCHEMATIC?
WHAT ALL DO I NEED TO BE ABLE TO ASSEMBLE/PROGRAM ?

ALSO, I ACCIDENTALLY BLEW LIKE 19.5 VDC·INTO THE VDD PIN ON A BS1-IC MODULE , YA'LL THINK ITS BROKE OR WHAT? IT WONT IDENTIFY OR DOWNLOAD. ANY CHANCE I CAN FIX IT?

Blackbird455

Ok , I see that the blue www looking lines are resistors as i thought they were, but what values to use?

Forrest

Your BS1 module is probably history. See the BS1 schematic at the bottom of this page www.parallax.com/detail.asp?product_id=BS1-IC

If you've got the space, the BS1 Project board - which contains a built-in BS1 and a serial programming port at $14.95 looks like a great deal and no soldering is required www.parallax.com/detail.asp?product_id=27112

Chris Savage

Hello,

OEM components and assembly of a BASIC Stamp are only recommended for those experienced with electronics, including reading a schematic. The resistors are all 10K. But that much voltage into the V_DD pin would’ve surely damaged the interpreter and EEPROM.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Tech Support

Blackbird455

Yeah thanks for your replies .....that is what I needed to know.....I am experienced with electronics, but what I should have said is "what are the values". All of the schematics that I deal with , Like the FLIR 2000, and 7500 rev.b, and the Global Wulfsberg C-5000 comm systems are well prepared and have not only the item # or name, but the values along with them, and not to mention , they are in black and white. And that whole incident with the 19.5 vDC on the VDD pin was the result of a combination of beer and a lack of sleep at 3 am, getting the pins cornfused on a LM7805 regulator*oopsie*. Thanks again tho, I'm sure Ill have plenty o more questions about the BASIC modules, as I have only been fiddlin around with them for about a month.

Blackbird455

It worked the first time!!!!!! I welded it together about 2 a.m. and it identified!!!!

Forrest

You really need to add capacitors to the 7805 or the output may oscillate. Check the 7805 datasheet from capacitor recommendations. If you're running off batteries, then you only need a capacitor across the outputs - such as a 1 to 10uF electrolytic.

Blackbird455

Yeah Im working on that, had someone tell me that a 1k ohm resistor was needed to keep a load on the 7805 and I cant remember what for. Any insight on this?

Forrest

I've built at least 5 power supplies using the 7805 - you don't need a resistor. But you do need the output capacitor and if you're drawing more than 200 millamps I'd recommend a heat sink on the 7805 - they can get very warm.