Quick question
Archiver
Posts: 46,084
When storing a 16bit word to the internal EEPROM of the stamp I use
the line
cont data word EEaddr
this stores the two bytes into two EEPROM addresses. My question is
that when I use the READ command do I need to cycle through the two
EEPROM addresses or will it read both bytes using this line
READ cont,EEaddr
Andy
the line
cont data word EEaddr
this stores the two bytes into two EEPROM addresses. My question is
that when I use the READ command do I need to cycle through the two
EEPROM addresses or will it read both bytes using this line
READ cont,EEaddr
Andy
Comments
READ location,note.highbyte 'read high byte and put in note word
READ location+1,note.lowbyte 'read low byte and put in note word
>From: "Andy Schwarz" <phyaks@p...>
>Reply-To: basicstamps@egroups.com
>To: basicstamps@egroups.com
>Subject: [noparse][[/noparse]basicstamps] Quick question
>Date: Mon, 13 Nov 2000 10:22:07 -0000
>
>When storing a 16bit word to the internal EEPROM of the stamp I use
>the line
>
>cont data word EEaddr
>
>this stores the two bytes into two EEPROM addresses. My question is
>that when I use the READ command do I need to cycle through the two
>EEPROM addresses or will it read both bytes using this line
>
>READ cont,EEaddr
>
>Andy
>
>
>
>
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Ive noticed in my reading that most electronics parts have a number code
associated with them that everyone else knows but me. Such as "use a small
signal diode here, a 1N914 should do fine".
Where do I get such a list of what numbers correspond to what parts? I got
a grab bag from jamco and I need to find out what half of this junk is. I
highly recommend these grab bags by the way. Dirt cheap compared to buying
your parts one by one with the only drawback of being in my situation and
not knowing what some of these parts are!!
Thanks again guys
Cy Brown
Here are a few common ones most people eventually learn (everyone will have
their favorites):
1N914 or 1N4148 - small signal Si diodes
1N400X - power diode where X is amperage (1N4001 is 1A, etc.)
2N2222, 2N2222A, etc. - General purpose NPN transistor; good for a switch
2N3904 - General purpose NPN transistor; similar to 2N2222
2N3906 - Same as 2N3904 but PNP
78XX - Voltage regulator (7805 is 5V); good to about 1A
78LXX - Same as 78XX but small case 100mA
79XX - Like 78XX but negative (7905 is -5V)
741 - General purpose op amp (not a very good one either)
555 - Timer building block -- make oscillators, one shots, anything with a
pulse
MAX232 - Maxim IC to convert RS232 to/from TTL with a 5V supply
MAX232A - Same as MAX232 but uses smaller caps
MAX233 - Same as MAX232 but uses no caps
For unknown parts try www.icmaster.com for the pinouts. Or try
http://www.xs4all.nl/~ganswijk/chipdir/. A fee based service is at Another
good site: http://www.chipdocs.com/. Some times you can cross to NTE,
although sometimes the NTE part is overrated compared to your part (in other
words, a transistor with Ic=500mA could sub for one with a 400mA rating --
maybe your part has 400mA). Look at http://www.nteinc.com/cgi-bin/nte
Hope that helps.
Al Williams
AWC
* Floating point math for the Stamp, PIC, SX, or any microcontroller at
http://www.al-williams.com/awce/pak1.htm
>
Original Message
> From: Cy Brown [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=tuvRWDKcDdWqT6QOlpOlKVy2JHrNjqMZgXfLVaWorbx2Rvay4LPnZZvk2q23tBvPAxysUL2qHa4UAU1J]bushman@t...[/url
> Sent: Monday, February 05, 2001 4:05 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Quick Question
>
>
> Another quickie for you guys.
> Ive noticed in my reading that most electronics parts have a number code
> associated with them that everyone else knows but me. Such as
> "use a small
> signal diode here, a 1N914 should do fine".
> Where do I get such a list of what numbers correspond to what
> parts? I got
> a grab bag from jamco and I need to find out what half of this junk is. I
> highly recommend these grab bags by the way. Dirt cheap compared
> to buying
> your parts one by one with the only drawback of being in my situation and
> not knowing what some of these parts are!!
>
> Thanks again guys
>
> Cy Brown
>
>
>
A clarifican on the 1N400x series diodes. These are 1A rectifier
diodes. The x is an indication of the peak reverse voltage (PRV)
rating. If I remember right, the 1N4001 is rated at 50PRV and is goes
up to 1000PRV for the 1N4007. Maybe someone can dig up the specs.
Regards,
Adolph Stumpf
--- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> This is largely experience-based.
>
> Here are a few common ones most people eventually learn (everyone
will have
> their favorites):
>
> 1N914 or 1N4148 - small signal Si diodes
> 1N400X - power diode where X is amperage (1N4001 is 1A, etc.)
> 2N2222, 2N2222A, etc. - General purpose NPN transistor; good for a
switch
> 2N3904 - General purpose NPN transistor; similar to 2N2222
> 2N3906 - Same as 2N3904 but PNP
> 78XX - Voltage regulator (7805 is 5V); good to about 1A
> 78LXX - Same as 78XX but small case 100mA
> 79XX - Like 78XX but negative (7905 is -5V)
> 741 - General purpose op amp (not a very good one either)
> 555 - Timer building block -- make oscillators, one shots, anything
with a
> pulse
> MAX232 - Maxim IC to convert RS232 to/from TTL with a 5V supply
> MAX232A - Same as MAX232 but uses smaller caps
> MAX233 - Same as MAX232 but uses no caps
>
> For unknown parts try www.icmaster.com for the pinouts. Or try
> http://www.xs4all.nl/~ganswijk/chipdir/. A fee based service is at
Another
> good site: http://www.chipdocs.com/. Some times you can cross to
NTE,
> although sometimes the NTE part is overrated compared to your part
(in other
> words, a transistor with Ic=500mA could sub for one with a 400mA
rating --
> maybe your part has 400mA). Look at
http://www.nteinc.com/cgi-bin/nte
>
> Hope that helps.
>
> Al Williams
> AWC
> * Floating point math for the Stamp, PIC, SX, or any microcontroller
at
> http://www.al-williams.com/awce/pak1.htm
>
Sorry about that!
Al Williams
AWC
Stamp project of the Month: http://www.al-williams.com/awce/som.htm
>
Original Message
> From: apstumpf@u... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=J5SO4OiyOpvJnsXsvlG9rDfJMPyy-i3rahF3hLRpqjszpIvnSOKnithsRWmmGQcX4mYNcGC6c96RpOQTB_Y]apstumpf@u...[/url
> Sent: Monday, February 05, 2001 10:49 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Quick Question
>
>
> Excellent list.
>
> A clarifican on the 1N400x series diodes. These are 1A rectifier
> diodes. The x is an indication of the peak reverse voltage (PRV)
> rating. If I remember right, the 1N4001 is rated at 50PRV and is goes
> up to 1000PRV for the 1N4007. Maybe someone can dig up the specs.
>
> Regards,
> Adolph Stumpf
>
>
> --- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> > This is largely experience-based.
> >
> > Here are a few common ones most people eventually learn (everyone
> will have
> > their favorites):
> >
> > 1N914 or 1N4148 - small signal Si diodes
> > 1N400X - power diode where X is amperage (1N4001 is 1A, etc.)
> > 2N2222, 2N2222A, etc. - General purpose NPN transistor; good for a
> switch
> > 2N3904 - General purpose NPN transistor; similar to 2N2222
> > 2N3906 - Same as 2N3904 but PNP
> > 78XX - Voltage regulator (7805 is 5V); good to about 1A
> > 78LXX - Same as 78XX but small case 100mA
> > 79XX - Like 78XX but negative (7905 is -5V)
> > 741 - General purpose op amp (not a very good one either)
> > 555 - Timer building block -- make oscillators, one shots, anything
> with a
> > pulse
> > MAX232 - Maxim IC to convert RS232 to/from TTL with a 5V supply
> > MAX232A - Same as MAX232 but uses smaller caps
> > MAX233 - Same as MAX232 but uses no caps
> >
> > For unknown parts try www.icmaster.com for the pinouts. Or try
> > http://www.xs4all.nl/~ganswijk/chipdir/. A fee based service is at
> Another
> > good site: http://www.chipdocs.com/. Some times you can cross to
> NTE,
> > although sometimes the NTE part is overrated compared to your part
> (in other
> > words, a transistor with Ic=500mA could sub for one with a 400mA
> rating --
> > maybe your part has 400mA). Look at
> http://www.nteinc.com/cgi-bin/nte
> >
> > Hope that helps.
> >
> > Al Williams
> > AWC
> > * Floating point math for the Stamp, PIC, SX, or any microcontroller
> at
> > http://www.al-williams.com/awce/pak1.htm
> >
>
>
>
>