|
|
(86 intermediate revisions by 61 users not shown) |
Line 1: |
Line 1: |
− | [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=208 phentermine online] [http://students.hsc.unt.edu/housing/item.cfm?type=2915 free mono ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30353 free mono ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a0e celexa online] [http://students.hsc.unt.edu/housing/item.cfm?type=2883 lipitor online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/alltelringtones_474.htm alltel ringtones] [http://wc1.worldcrossing.com/WebX/.1de609dd free alltel ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/clonazepam_4321.htm cheap clonazepam] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=144 xanax online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=148 zyban online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=119 free punk ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2871 cheap wellbutrin] [http://students.hsc.unt.edu/housing/item.cfm?type=2866 levitra online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30298 lisinopril online] [http://library.cshl.edu/wp/vb/member.php?u=1352 norco online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=124 free samsung ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1353 vicodin online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=135 cheap ultracet] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3700 online norco] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30308 lipitor online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30315 buy lortab] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30310 tenuate online] [http://users.wpi.edu/~dance/blahdocs/uploads/nextelringtones_5134.htm nextel ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/lorazepam_17.htm lorazepam online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=199 free music ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=112 cheap ortho] [http://library.cshl.edu/wp/vb/member.php?u=1361 xenical online] [http://students.hsc.unt.edu/housing/item.cfm?type=2855 buy diazepam] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=68 buy adipex] [http://users.wpi.edu/~dance/blahdocs/uploads/samsungringtones_3147.htm samsung ringtones] [http://users.wpi.edu/~dance/blahdocs/uploads/carisoprodol_7292.htm carisoprodol online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30297 albuterol online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=162 free alltel ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3702 paxil online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3758 buy rivotril] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30263 levitra online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=142 wellbutrin online] [http://library.cshl.edu/wp/vb/member.php?u=1357 cheap levitra] [http://wc1.worldcrossing.com/WebX/.1de609ea free free ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30314 buy pharmacy online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30240 carisoprodol online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/tramadol_3245.htm buy tramadol] [http://wc1.worldcrossing.com/WebX/.1de609e6 cyclobenzaprine online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=103 free mono ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30248 ativan online] [http://library.cshl.edu/wp/vb/member.php?u=1385 sony ericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a22 but phentermine] [http://students.hsc.unt.edu/housing/item.cfm?type=2901 mp3 ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3769 sony ericsson ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=127 soma online] [http://library.cshl.edu/wp/vb/member.php?u=1349 viagra online] [http://wc1.worldcrossing.com/WebX/.1de60a2c ultram] [http://wc1.worldcrossing.com/WebX/.1de60a10 cheap didrex] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=111 cheap norco] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=224 free sagem ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30345 sprint ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=76 cialis] [http://wc1.worldcrossing.com/WebX/.1de60a05 sprint ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=234 sprint ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1381 polyphonic ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2873 cheap nexium] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=92 hydrocodone online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=226 cheap tramadol] [http://students.hsc.unt.edu/housing/item.cfm?type=2925 mtv ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a34 free sony ericsson ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2921 free wwe ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=109 free nextel ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/funnyringtones_5351.htm funny ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3735 mtv ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=227 cheap ultracet] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=231 rivotril online] [http://wc1.worldcrossing.com/WebX/.1de60a1f lisinopril online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/xanax_4637.htm cheap xanax] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30359 wwe ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3751 sildenafil online] [http://users.wpi.edu/~dance/blahdocs/uploads/ambien_6489.htm cheap ambien] [http://students.hsc.unt.edu/housing/item.cfm?type=2847 buy tramadol] [http://library.cshl.edu/wp/vb/member.php?u=1345 ultram online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/ativan_9901.htm ativan online] [http://users.wpi.edu/~dance/blahdocs/uploads/lorazepam_3885.htm lorazepam online] [http://users.wpi.edu/~dance/blahdocs/uploads/alprazolam_3561.htm alprazolam online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=186 jazz ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30259 cheap alprazolam] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/phentermine_8208.htm cheap phentermine] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=191 lorazepam online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=138 verizon ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2912 sagem ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/carisoprodol_1193.htm cheap carisoprodol] [http://students.hsc.unt.edu/housing/item.cfm?type=2911 free cingular ringtones] [http://users.wpi.edu/~dance/blahdocs/uploads/realringtones_3783.htm real ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=96 levitra online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3749 cheap ultracet] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30349 cingular ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3737 phentermine] [http://wc1.worldcrossing.com/WebX/.1de60a0b cheap vigrx] [http://wc1.worldcrossing.com/WebX/.1de60a28 soma online] [http://library.cshl.edu/wp/vb/member.php?u=1371 free funny ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2868 cheap ambien] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=126 sildenafil online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=129 free sony ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3762 free funny ringtones] [http://users.wpi.edu/~dance/blahdocs/uploads/paxil_2293.htm paxil online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3755 cheap ortho] [http://library.cshl.edu/wp/vb/member.php?u=1360 order lorazepam] [http://users.wpi.edu/~dance/blahdocs/uploads/freeringtones_1986.htm free ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1348 cheap ativan] [http://wc1.worldcrossing.com/WebX/.1de60a24 propecia online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30336 free qwest ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/paxil_4058.htm paxil online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3706 buy wellbutrin] [http://library.cshl.edu/wp/vb/member.php?u=1367 didrex online] [http://library.cshl.edu/wp/vb/member.php?u=1364 cheap nexium] [http://library.cshl.edu/wp/vb/member.php?u=1342 phentermine online] [http://library.cshl.edu/wp/vb/member.php?u=1376 free motorola ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a25 samsung ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a2d valium online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30277 buy cyclobenzaprine] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30243 cheap ultram] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30327 buy zyban] [http://students.hsc.unt.edu/housing/item.cfm?type=2916 free alltel ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1339 cheap tramadol] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=212 propecia online] [http://students.hsc.unt.edu/housing/item.cfm?type=2910 free polyphonic ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=177 diethylpropion online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=175 cheap diazepam] [http://library.cshl.edu/wp/vb/member.php?u=1380 verizon ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30296 clomid online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3767 polyphonic ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3763 free nextel ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f7 nextel ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=98 lisinopril] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=118 prozac online] [http://wc1.worldcrossing.com/WebX/.1de60a1e flexeril online] [http://wc1.worldcrossing.com/WebX/.1de60a35 verizon ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/nextelringtones_3485.htm nextel ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3695 carisoprodol online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=241 sony ericsson ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3723 motorola ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30318 cheap diethylpropion] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30253 norco online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30350 free sagem ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1372 mp3 ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a1d cingular ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=168 celexa online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=221 cheap vicodin] [http://library.cshl.edu/wp/vb/member.php?u=1350 order meridia] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30363 free sony ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=202 nokia ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=84 diethylpropion online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3716 diethylpropion online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=233 sonyericsson ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30266 lorazepam online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/ultracet_2738.htm cheap ultracet] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=230 verizon ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3738 online xanax] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=83 didrex online] [http://library.cshl.edu/wp/vb/member.php?u=1343 cheap carisoprodol] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30365 mtv ringtones] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/freeringtones_8902.htm free ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3696 fioricet online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=136 cheap ultram] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/norco_532.htm norco] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3766 music ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=170 cingular ringtones] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=90 hgh online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/propecia_2137.htm propecia online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/ambien_7869.htm buy ambien] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3750 cheap didrex] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=189 lipitor] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=139 viagra online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3699 meridia online] [http://students.hsc.unt.edu/housing/item.cfm?type=2851 buy carisoprodol] [http://students.hsc.unt.edu/housing/item.cfm?type=2918 free cool ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30316 cheap vigrx] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/verizonringtones_8798.htm free verizon ringtones] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30330 free nokia ringtones] [http://wc1.worldcrossing.com/WebX/.1de609de but alprazolam] [http://wc1.worldcrossing.com/WebX/.1de609e5 free cool ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1359 ambien online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=82 buy diazepam] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=206 pharmacy online online] [http://users.wpi.edu/~dance/blahdocs/uploads/nokiaringtones_4263.htm free nokia ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3741 viagra online] [http://library.cshl.edu/wp/vb/member.php?u=1382 free cingular ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2905 motorola ringtones] [http://library.cshl.edu/wp/vb/member.php?u=1358 hydrocodone online] [http://www.e.kth.se/cgi-bin/esekt/discussion?command=read&discussionid=4&id=30309 cheap celexa] [http://users.wpi.edu/~dance/blahdocs/uploads/nexium_6814.htm nexium online] [http://library.cshl.edu/wp/vb/member.php?u=1363 cyclobenzaprine online] [http://wc1.worldcrossing.com/WebX/.1de60a1b music ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2914 sony ericsson ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3729 mono ringtones] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=5&tid=3734 sony ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f9 norco online] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=97 lipitor online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3747 xenical online] [http://users.wpi.edu/~dance/blahdocs/uploads/ultram_1401.htm ultram online] [http://students.hsc.unt.edu/housing/item.cfm?type=2849 cheap valium] [http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=85 free ericsson ringtones] [http://students.hsc.unt.edu/housing/item.cfm?type=2877 cheap prozac] [http://people.msoe.edu/~millerni/forums.php?show=topic
| + | A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than the RS232 standard of around negative 10V to positive 10V. Very convenient - no external power required! Note that you may use either a 5.1V zener or a 5V regulator. |
| + | [[Image:PicPcSerialSchematic.gif ]] |
| + | |
| + | <br><br>In the circuit above, the two 1N4148 diodes prevent any negative voltage getting into the rest of the circuit if either DTR or RTS would happen to go negative. The two transistors function as transistor switches. The transistors also act as inverters. We need to invert things since the pc serial port uses positive voltage to represent binary 0 (RS232 SPACE) and negative voltage (or lucky for us 0 voltage) for binary 1 (RS232 MARK). Of course the voltage regulator regulates the voltage with some decoupling capacitors. A zener diode can also be used to regulate the voltage. In my schematic, you can see that I developed this for my PIC projects, but other microcontrollers will probably have similar serial communications methods and similar supply voltage requirements. |
| + | <br><br> |
| + | One thing I needed to do to use this with my solderless breadboard was to connect the metal on the bottom of the breadboard to ground. You may need a similar sort of grounded shielding near your circuitry if you use this. |
| + | |
| + | * NØXAS shows [http://botkin.org/dale/rs232_interface.htm how to replace the BJTs in this circuit with FETs], which is simpler and (now that FETs have plummeted in price) cheaper. |
| + | |
| + | [[Category:Projects]] |
Latest revision as of 05:15, 16 July 2008
A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than the RS232 standard of around negative 10V to positive 10V. Very convenient - no external power required! Note that you may use either a 5.1V zener or a 5V regulator.
In the circuit above, the two 1N4148 diodes prevent any negative voltage getting into the rest of the circuit if either DTR or RTS would happen to go negative. The two transistors function as transistor switches. The transistors also act as inverters. We need to invert things since the pc serial port uses positive voltage to represent binary 0 (RS232 SPACE) and negative voltage (or lucky for us 0 voltage) for binary 1 (RS232 MARK). Of course the voltage regulator regulates the voltage with some decoupling capacitors. A zener diode can also be used to regulate the voltage. In my schematic, you can see that I developed this for my PIC projects, but other microcontrollers will probably have similar serial communications methods and similar supply voltage requirements.
One thing I needed to do to use this with my solderless breadboard was to connect the metal on the bottom of the breadboard to ground. You may need a similar sort of grounded shielding near your circuitry if you use this.