Catalog for measurements temperatureFull description
68HC11
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PptFull description
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Now Available in hard-cover, hand-crafted and signed by the author, from my web-site. Minor Update: 27 January, 2013. (See chapter: The Radian Comma.) The way we measure time and space reflects the...
sacred geometry
Experiment IIT Kharagpur IPC LabFull description
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Robert Scott Fritzsche
68HC11 Temperature measure and Display Introduction This lab is to show how the A/D converter on the 68HC11 works and the the hardware reqired to do it! The ob"ective and reqire#ents o$ the lab were to write code to se the A/D converter and know the hardware reqire#ents to se the te#%eratre sensor! &e were to scale the Te#%eratre sensor to read $ro# ' to 1'' Celsis! (nclded in this ob"ective was the task o$ connectin) the te#%eratre sensor and the *+Ds to the HC11! Also inclded in this ob"ective was the task o$ desi)nin) so$tware to do the $ollowin), initialize the A/D converter and serial sbs-ste#s. control the #easre#ent and stora)e o$ te#%eratre in a RA variable called T+0. and control control the dis%ladis%la- o$ te#%eratre te#%eratre on the *+D ot%ts! ot%ts!
Procedures for testing and Design Fi)re 1
Fi)re 1 shows the interaction between the 68HC11 and the *211 sensor! 0rocedre was to test the *6211 and record data o3 o$ the te#%eratre readin) o$ an ice bath that is )radall- heated! Then on the in%t in%t o$ the ter#inal ter#inal tell the the 68HC11 to read read and dis%ladis%la- the te#% and the corres%ondin) *+D n#ber $or the )iven te#% as well!
Robert Scott Fritzsche
Connecting the Temperature sensor to the 68HC11 The *211 is the sensor that was sed in the lab! The cold not be directl- connected to the 68HC11 becase it ot%t a crrent and the 68HC11 A/D converter can onlbe s%%lied with a 4olta)e sorce between '54! To solve this %roble# a new circit was desi)ned to convert the crrent to volta)e in the %ro%er #anor!
*211 wold
To the ri)ht is the inte)rated o%5a#% that allows $or the *211 to s%%l- a crrent and ths s%%l- a volta)e to the 68HC11!
Testing procedure and results
Ther#o#eter vs &ater :ath vs 68HC11 2' 8' 9' 6' ' ' ' 7' 1' '
'
7
6
8
1'
Ther#o#itor
17
1
16
18
68HC11
&ater :ath Readin)
For the Testin); we had a bath o$ ice water inside $or the water bath heater! To allow $or consistent reslts we also inclded a #ercr- ther#o#eter! ( took readin)s $ro# the lowest %oint we
Robert Scott Fritzsche cold reach and read which was 7 de)rees C and then took readin) at de)ree intervals! At %ot resistor and tned it till the reslts lined %! There are still so#e variations in the reslts! :t $or the #ost %art the readin)s were within a de)ree or so!
Conclusion This re%ort shows how the 68HC11 hardware and so$tware co#bined with the *211 can be sed to #ake a viable te#%eratre sensor! &hile all o$ the readin) were not e=actl- as read b- either the ther#o#eter or the water bath sensor; this cold be
Robert Scott Fritzsche
Appendix: Fi)re 1 shows an accrate re%resentation o$ the 68HC11 hardware! This %ictre was taken $ro# the internet and shows a sli)ht %roble#! - code ses the 0+1 %ort and not the 0+7 %ort on the 68HC11! The second %roble# is that the <)re was desi)ned $or 7'52' de)rees F and not '51'' de)rees C!
lo! Chart
Robert Scott Fritzsche
A"# Code ?+@R 7' (ntrodction to icrocontrollers ?A/D Converter
?Static 4ariables
BTRH*F BTA
+ +
EFF: EFF:8
BTSTR
+
EFFC9
BTCR*F
+
EFFC
BTSTRB
+
EFFCA
(@CHAR
+
EFFCD
ADCT*
+
E1''
.De
Robert Scott Fritzsche 0+1
+
E1'7
?D-na#ic 4ariables
d1
+
ED:'1
d7
+
ED:'7
d
+
ED:'
d
+
ED:'
d
+
ED:'
0ort:
+
or) D((TA*
E1''
E8''' R:
4B*TA+
1
R:
T+0
R:
7
.Reserve b-tes
7
?0ro#%t ser $or ke-board %ress
BR 0ro#%t
E2'''
FCC FC:
Celsis
0ress to dis%la- Te#%
E'
FCC FC:
De)rees Celsis E'
?ain loo%
BR :AC>
EA'''
*DG
0ro#%t
ISR
BTSTR
ISR
BTCR*F
ISR
(@CHAR
ISR
T+0S:
.(n%t .Converts to deci#al
Robert Scott Fritzsche ISR
*+DS:
ISR
:(@:CD
ISR
0rint
I0
:AC>
.Trn on *+Ds .Convert to deci#al .0rints te#%eratre
?Te#% SR
BR
E:'''
*DAA
J'''''''1
STAA
ADCT*
*DA:
16
T+0S:
Ti#e
.Scan once; sin)le channel; 0+1
.wait loo% K7 c-clesL
D+C: :@+
Ti#e
*DAA
0+1
STAA
D((TA*
*DA:
7'
.Decre#ent : Ktwo clock c-clesL
* STD
4B*TA+
*DAA
D((TA*
*DA:
.volta)e in #illivolts
.ste% size
* STD
T+0
.Te#% is in Kde)ress C / 1'L
RTS
?*+D SR
BR
EC'''
*+DS: *DAA D((TA* stored in %ort :L
.*ed 1 trns on $ro# a ran)e $ro# vales $ro# '51 Kall reslts
Robert Scott Fritzsche *DA:
1
STA:
ECF''
C0A
ECF''
:H(
T&B
*DAA
J'''''''1
STAA
0ort:
I0
DB@+
T&B *DAA
D((TA*
*DA:
6
STA:
ECF''
C0A
ECF''
:H(
.*ed 7 trns on $ro# a ran)e $ro# vales $ro# 756
THR++
*DAA
J''''''11
STAA
0ort:
I0
DB@+
THR++ *DAA
D((TA*
*DA:
21
STA:
ECF''
C0A
ECF''
:H(
.*ed trns on $ro# a ran)e $ro# vales $ro# 6521
FBR
*DAA
J'''''111
STAA
0ort:
I0
DB@+
FBR *DAA
D((TA*
.*ed trns on $ro# a ran)e $ro# vales $ro# 275179
Robert Scott Fritzsche *DA:
179
STA:
ECF''
C0A
ECF''
:H(
*DAA
J''''1111
STAA
0ort:
I0
F(4+
D((TA*
*DA:
18
STA:
ECF''
C0A
ECF''
.*ed trns on $ro# a ran)e $ro# vales $ro# 178518
S(G
*DAA
J'''11111
STAA
0ort:
I0
DB@+
*DAA
D((TA*
*DA:
12'
STA:
ECF''
C0A
ECF''
:H(
.*ed 6 trns on $ro# a ran)e $ro# vales $ro# 12512'
S+4+@
*DAA
J''111111
STAA
0ort:
I0
S+4+@
DB@+
*DAA
:H(
S(G
F(4+
DB@+
*DAA
D((TA*
*DA:
777
STA:
ECF''
C0A
ECF''
.*ed 9 trns on $ro# a ran)e $ro# vales $ro# 1215777
Robert Scott Fritzsche :H(
*DAA
J'1111111
STAA
0ort:
I0
+(HT
+(HT
DB@+
*DAA STAA
J11111111 .*ed 8 trns on an-thin) )reater than 777
0ort:
DB@+ RTS
?Conversion SR
BR
ED'''
*DD
T+0
*DG
1'''
:(@:CD
(D(4
GDG STA:
.stores the tens di)it into db'7
GDG *DG
(D(4
GDG STA:
d7
.load di)ital vale
1''
d
.stores the ones di)it into db'
GDG *DG
(D(4
GDG STA:
1'
d
.stores the tenths di)it into d'
Robert Scott Fritzsche
GDG STA:
d
.stores the hndreths di)it into db'
RTS
?0rintin) SR
BR
ED8''
*DAA
d7
0R(@T
ISR
*DAA ISR
*DAA ISR
*DAA ISR
*DAA
BTRH*F
d
.%rints the hndreds di)it
BTRH*F
d
.%rints the tens di)it
BTRH*F
E7+
.%rints the deci#al %oint with the BTA sbrotine
