Temperature control with a stamp
Archiver
Posts: 46,084
I'd like to be able to do two things with a basic stamp that I
don't know how to do. Looking for some advice.
First, I want to be able to measure the temperature of peanut oil
when it's between 300 and 400 degrees F. (I'm cooking with it.)
Second, I want to be able to control the flow of propane to the
burner to control the oil temperature to a setpoint in that
range.
On the software side I know a bit about real-time control but I'm
not a real electrical geek and don't know how to connect the
stamp to these real-world devices (temperature input and valve
control).
For the temperature I assume I'll need a thermocouple that can be put
in hot liquid. I'm looking for suggestions on where to shop for them
and how to connect them to the stamp.
For gas flow control I need some kind of computer-controlled-valve.
I'd love to be able to do this and keep as much of the propane
standard connection scheme as possible but I'm flexible.
don't know how to do. Looking for some advice.
First, I want to be able to measure the temperature of peanut oil
when it's between 300 and 400 degrees F. (I'm cooking with it.)
Second, I want to be able to control the flow of propane to the
burner to control the oil temperature to a setpoint in that
range.
On the software side I know a bit about real-time control but I'm
not a real electrical geek and don't know how to connect the
stamp to these real-world devices (temperature input and valve
control).
For the temperature I assume I'll need a thermocouple that can be put
in hot liquid. I'm looking for suggestions on where to shop for them
and how to connect them to the stamp.
For gas flow control I need some kind of computer-controlled-valve.
I'd love to be able to do this and keep as much of the propane
standard connection scheme as possible but I'm flexible.
Comments
On Mon, 28 May 2001 abreu@m... wrote:
> I'd like to be able to do two things with a basic stamp that I
> don't know how to do. Looking for some advice.
>
> First, I want to be able to measure the temperature of peanut oil
> when it's between 300 and 400 degrees F. (I'm cooking with it.)
>
> Second, I want to be able to control the flow of propane to the
> burner to control the oil temperature to a setpoint in that
> range.
>
> On the software side I know a bit about real-time control but I'm
> not a real electrical geek and don't know how to connect the
> stamp to these real-world devices (temperature input and valve
> control).
>
> For the temperature I assume I'll need a thermocouple that can be put
> in hot liquid. I'm looking for suggestions on where to shop for them
> and how to connect them to the stamp.
I just finished a project for a customer that needed to measure and
maintain the temperature of oil to within one degree. I used a Type-J
Thermocouple connected to an AD594CD thermocouple chip. The chip outputs
10mV/degreeC in the range of 0-5 volts. I then fed the 0-5 volts into a
12-bit A/D converter.
--- Jay
+
+
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+
+
9:00pm up 91 days, 14:28, 9 users, load average: 0.10, 0.08, 0.07
Great info I have a similar problem however I was wondering in
regards to measuring more than one thermocouple. would putting the
different thermocouples through a multiplexer be okay or would you
suggest that I use 4 independant ad594's then feed those voltages
into an ADC0834. Or is there a different way to do this I would
greatly value any input
Thank you
Aaron
address, hence, a Yahoo server returned the message undelivered. To try
again:
Ditto on the 594. They're costly, but reliable. Be sure to make your
thermocouple connections according to the ap notes so your results will be
fairly close to real-world temps.
As for PID control with the Stamp, there is a well-done section in "Stamps
in Class" I believe, or some such place on the Parallax site that should
help. A stamp is not the best device for any kind of complex PID control,
but you should be able to keep a super-slow process like heating a pot of
oil within a tight enough hysteresis for on-off control of a burner for
cooking.
Chris
a K type thermocouple. Below is example pbasic code. This is a dip chip that
can handle up to eight thermocouples.
Chuck
'Program used to measure voltage analog data using a CIRRUS LOGIC CS5522, 24
bit ADC chip
'PARALLAX BS2p24 reads I/O data from the CS5522 thermocouple input (0 to
100mv) channels 1 and 2
'Crystal CS5521/22/23/24 Datatasheet DS317F2 (May '00) page 43, figure 21,
for connection setup
'requires chromel/alumel thermocouple table in program #1, ktab.bsp
'5/7/01
'{$STAMP BS2p,ktab}
dathi var word 'thermocouple 12 bit high address
datlo var word 'thermocouple 12 bit low address
cojhi var word 'cold junction 12 bit high address
cojlo var word 'cold junction 12 bit low address
x var word
y var word
r var word
v var word
s var word
rhi var byte
rlo var byte
rn var byte
'BS2p pin connections to CS5522
SCLK con 11 ' ADC Clock
SDO con 10 ' ADC Data output
SDI con 9 ' ADC Data input
CS con 8 ' Chip select
high CS
pause 500
serout 14,16630,[noparse][[/noparse]254,255] 'turn on lcd backlight
serout 14,16620,[noparse][[/noparse]254,1]
serout 14,16620,[noparse][[/noparse]"Setup for reading a"]
serout 14,16620,[noparse][[/noparse]254,192]
serout 14,16620,[noparse][[/noparse]"thermocouple and a"]
serout 14,16620,[noparse][[/noparse]254,148]
serout 14,16620,[noparse][[/noparse]"cold junction room"]
serout 14,16620,[noparse][[/noparse]254,212]
serout 14,16620,[noparse][[/noparse]"temperatures."]
pause 5000
low CS
gosub RESET 'reset CS5522
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001011] 'read configuration register
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " CONFIG:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
dathi=%000000001000 'write cnfiguration register
datlo=%000000000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000011,dathi\12,datlo\12]
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001011] 'read configuration register
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " CONFIG:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
dathi=%000000001000 'write cnfiguration register
datlo=%000000000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000011,dathi\12,datlo\12]
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001011] 'read configuration register
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " CONFIG:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
dathi=%000001100001 'write cnfiguration register
datlo=%000000000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000011,dathi\12,datlo\12]
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001011] 'read configuration register
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " CONFIG:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
dathi=%100100111010 'write gain register 1 (C/A thermocouple)
datlo=%000000000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00010010,dathi\12,datlo\12]
dathi=%010000000000 'write gain register 2 (LM334 cold
junction)
datlo=%000000000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000010,dathi\12,datlo\12]
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001010] 'read gain register 1
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " GAIN:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
datlo=%000010000011 'write channel setup registers 1 and 2
dathi=%000000001000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000101,dathi\12,datlo\12]
shiftout SDI,SCLK,1,[noparse][[/noparse]%00001101] 'read channel setup register 1
shiftin SDO,SCLK,0,[noparse][[/noparse]dathi\12,datlo\12]
debug " SETUP:",cr,"bits 23 to 12 ",bin12 dathi,cr,"bits 11 to 0 ",bin12
datlo,cr,cr
store 1 'C/A thermocouple data table from 0 to 2000 C
serout 14,16620,[noparse][[/noparse]254,1]
serout 14,16620,[noparse][[/noparse]"BS2p40 reads a LM335"]
serout 14,16620,[noparse][[/noparse]254,192]
serout 14,16620,[noparse][[/noparse]"and C/A Thermocouple"]
REPEAT
shiftout SDI,SCLK,1,[noparse][[/noparse]%10001000] 'activate data reading of channels 1
and 2
pause 500
shiftin SDO,SCLK,0,[noparse][[/noparse]cojhi\12,cojlo\12,dathi\12,datlo\12]
r=(((cojhi<<12)+(cojlo>>0)))
debug " Voltage1 = ",dec r," counts",cr
v=(r/79)-273
serout 14,16620,[noparse][[/noparse]254,148]
pause 1
serout 14,16620,[noparse][[/noparse]dec v," deg C @LM335 ··"]
debug " Voltage1 = ",dec v," deg C @LM335",cr
s=2*v
read s,rhi
read s+1,rlo
r=(((dathi<<12)+(datlo<<0))*4)-200 'convert to lower 16
bits only
v=r
r=r+(rhi*256)+rlo
dathi=r.highbyte:datlo=r.lowbyte
' debug " Voltage2 = ",dec r," counts",cr
for x=0 to 2000 step 2
read x,y
if y=dathi then aa
next
aa:
for s=x+1 to 2000 step 2
read s,y
read s-1,rn
if dathi<rn then aaa
if y>= datlo then aaa
next
aaa:
s=s/2
debug " Voltage2 = ",dec v," counts ", dec s," deg C @LM2904",cr
pause 1
v=((s*18)/10)+32
serout 14,16620,[noparse][[/noparse]254,212,dec v," deg F @LM2940 ·"]
goto REPEAT
RESET 'initialize CS5522
shiftout
SDI,SCLK,1,[noparse][[/noparse]$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FE]
dathi=%000000000000 'activate reset in configuration register
datlo=%000010000000
shiftout SDI,SCLK,1,[noparse][[/noparse]%00000011,dathi\12,datlo\12]
return
'Chromel/Alumel type K thermocouple tables in 16 bit format
'voltage output (mv)= (highbyte*256 + lowbyte)/1000 @0 C ref. temp
'4/22/01
'temp (C) temp+0 temp+1 temp+2 temp+3
temp+4 temp+5 temp+6 temp+7 temp+8
temp+9
k0 data 0 , 0 , 0 , 39 , 0 , 79 , 0 , 119 , 0
, 158 , 0 , 198 , 0 , 238 , 1 , 21 , 1 , 61 , 1
, 101
k10 data 1 , 141 , 1 , 181 , 1 , 221 , 2 , 5 , 2
, 45 , 2 , 85 , 2 , 125 , 2 , 165 , 2 , 206 , 2
, 246
k20 data 3 , 30 , 3 , 70 , 3 , 111 , 3 , 151 , 3
, 192 , 3 , 232 , 4 , 16 , 4 , 56 , 4 , 98 , 4
, 139
k30 data 4 , 179 , 4 , 220 , 5 , 4 , 5 , 46 , 5
, 86 , 5 , 127 , 5 , 168 , 5 , 209 , 5 , 250 , 6
, 34
k40 data 6 , 76 , 6 , 117 , 6 , 158 , 6 , 199 , 6
, 240 , 7 , 24 , 7 , 66 , 7 , 107 , 7 , 149 , 7
, 190
k50 data 7 , 231 , 8 , 16 , 8 , 57 , 8 , 98 , 8
, 140 , 8 , 182 , 8 , 222 , 9 , 7 , 9 , 50 , 9
, 91
k60 data 9 , 132 , 9 , 174 , 9 , 215 , 10 , 0 ,
10 , 41 , 10 , 84 , 10 , 125 , 10 , 166 , 10 , 207 ,
10 , 250
k70 data 11 , 34 , 11 , 76 , 11 , 118 , 11 , 160 ,
11 , 200 , 11 , 243 , 12 , 28 , 12 , 69 , 12 , 112 ,
12 , 153
k80 data 12 , 194 , 12 , 235 , 13 , 22 , 13 , 63 ,
13 , 104 , 13 , 146 , 13 , 188 , 13 , 229 , 14 , 15 ,
14 , 56
k90 data 14 , 97 , 14 , 138 , 14 , 181 , 14 , 222 ,
15 , 7 , 15 , 48 , 15 , 91 , 15 , 132 , 15 , 172 ,
15 , 214
k100 data 16 , 0 , 16 , 41 , 16 , 83 , 16 , 123 ,
16 , 165 , 16 , 207 , 16 , 248 , 17 , 32 , 17 , 74 ,
17 , 116
k110 data 17 , 157 , 17 , 197 , 17 , 239 , 18 , 25 ,
18 , 66 , 18 , 106 , 18 , 148 , 18 , 188 , 18 , 230 ,
19 , 14
k120 data 19 , 55 , 19 , 97 , 19 , 137 , 19 , 179 ,
19 , 219 , 20 , 3 , 20 , 45 , 20 , 86 , 20 , 126 ,
20 , 168
k130 data 20 , 208 , 20 , 248 , 21 , 34 , 21 , 74 ,
21 , 114 , 21 , 156 , 21 , 196 , 21 , 237 , 22 , 20 ,
22 , 61
k140 data 22 , 103 , 22 , 143 , 22 , 183 , 22 , 233 ,
23 , 7 , 23 , 49 , 23 , 89 , 23 , 129 , 23 , 169 ,
23 , 209
k150 data 23 , 249 , 24 , 35 , 24 , 75 , 24 , 115 ,
24 , 155 , 24 , 195 , 24 , 235 , 25 , 19 , 25 , 59 ,
25 , 100
k160 data 25 , 140 , 25 , 180 , 25 , 220 , 26 , 4 ,
26 , 44 , 26 , 84 , 26 , 124 , 26 , 164 , 26 , 204 ,
26 , 244
k170 data 27 , 28 , 27 , 68 , 27 , 108 , 27 , 147 ,
27 , 187 , 27 , 227 , 28 , 11 , 28 , 51 , 28 , 91 ,
28 , 131
k180 data 28 , 171 , 28 , 211 , 28 , 252 , 29 , 35 ,
29 , 76 , 29 , 116 , 29 , 154 , 29 , 194 , 29 , 234 ,
30 , 18
k190 data 30 , 58 , 30 , 98 , 30 , 139 , 30 , 179 ,
30 , 219 , 31 , 3 , 31 , 43 , 31 , 83 , 31 , 122 ,
31 , 163
k200 data 31 , 201 , 31 , 242 , 32 , 25 , 32 , 65 ,
32 , 106 , 32 , 145 , 32 , 186 , 32 , 225 , 33 , 10 ,
33 , 51
k210 data 33 , 90 , 33 , 131 , 33 , 170 , 33 , 211 ,
33 , 250 , 34 , 35 , 34 , 74 , 34 , 115 , 34 , 155 ,
34 , 196
k220 data 34 , 235 , 35 , 20 , 35 , 59 , 35 , 100 ,
35 , 141 , 35 , 181 , 35 , 220 , 36 , 5 , 36 , 46 ,
36 , 85
k230 data 36 , 127 , 36 , 166 , 36 , 207 , 36 , 248 ,
37 , 31 , 37 , 72 , 37 , 113 , 37 , 153 , 37 , 194 ,
37 , 235
k240 data 38 , 18 , 38 , 60 , 38 , 99 , 38 , 140 ,
38 , 181 , 38 , 221 , 39 , 6 , 39 , 47 , 39 , 87 ,
39 , 128
k250 data 39 , 169 , 39 , 210 , 39 , 250 , 40 , 35 ,
40 , 76 , 40 , 116 , 40 , 157 , 40 , 199 , 40 , 240 ,
41 , 23
k260 data 41 , 64 , 41 , 106 , 41 , 147 , 41 , 187 ,
41 , 228 , 42 , 14 , 42 , 55 , 42 , 96 , 42 , 136 ,
42 , 177
k270 data 42 , 219 , 43 , 4 , 43 , 45 , 43 , 85 ,
43 , 126 , 43 , 168 , 43 , 209 , 43 , 251 , 44 , 36 ,
44 , 76
k280 data 44 , 117 , 44 , 159 , 44 , 200 , 44 , 242 ,
45 , 27 , 45 , 67 , 45 , 110 , 45 , 150 , 45 , 191 ,
45 , 233
k290 data 46 , 18 , 43 , 27 , 46 , 101 , 46 , 143 ,
46 , 184 , 46 , 224 , 47 , 10 , 47 , 51 , 47 , 93 ,
47 , 134
k300 data 47 , 176 , 47 , 218 , 48 , 3 , 48 , 45 ,
48 , 86 , 48 , 128 , 48 , 169 , 48 , 211 , 48 , 251 ,
49 , 38
k310 data 49 , 80 , 49 , 120 , 49 , 163 , 49 , 203 ,
49 , 245 , 50 , 30 , 50 , 72 , 50 , 114 , 50 , 155 ,
50 , 197
k320 data 50 , 239 , 51 , 4 , 51 , 66 , 51 , 108 ,
51 , 149 , 51 , 191 , 51 , 233 , 52 , 18 , 52 , 60 ,
52 , 102
k330 data 52 , 145 , 52 , 185 , 52 , 227 , 53 , 14 ,
53 , 56 , 53 , 96 , 53 , 139 , 53 , 181 , 53 , 223 ,
54 , 9
k340 data 54 , 50 , 54 , 92 , 54 , 134 , 54 , 176 ,
54 , 217 , 55 , 3 , 55 , 45 , 55 , 86 , 55 , 128 ,
55 , 170
k350 data 55 , 212 , 55 , 255 , 56 , 41 , 56 , 83 ,
56 , 125 , 56 , 167 , 56 , 209 , 56 , 250 , 57 , 36 ,
57 , 78
k360 data 57 , 120 , 57 , 163 , 57 , 205 , 57 , 247 ,
58 , 33 , 58 , 75 , 58 , 116 , 58 , 158 , 58 , 200 ,
58 , 242
k370 data 59 , 28 , 59 , 71 , 59 , 113 , 59 , 155 ,
59 , 197 , 59 , 239 , 60 , 24 , 60 , 66 , 60 , 108 ,
60 , 150
k380 data 60 , 194 , 60 , 236 , 61 , 21 , 61 , 63 ,
61 , 105 , 61 , 147 , 61 , 189 , 61 , 233 , 62 , 19 ,
62 , 60
k390 data 62 , 102 , 62 , 144 , 62 , 187 , 62 , 230 ,
63 , 15 , 63 , 57 , 63 , 100 , 63 , 141 , 63 , 184 ,
63 , 227
k400 data 64 , 12 , 64 , 55 , 64 , 97 , 64 , 140 ,
64 , 181 , 64 , 224 , 65 , 10 , 65 , 53 , 65 , 94 ,
65 , 137
k410 data 65 , 180 , 65 , 221 , 66 , 7 , 66 , 50 ,
66 , 93 , 66 , 134 , 66 , 178 , 66 , 219 , 67 , 6 ,
67 , 49
k420 data 67 , 90 , 67 , 133 , 67 , 175 , 67 , 218 ,
68 , 5 , 68 , 46 , 68 , 88 , 68 , 131 , 68 , 174 ,
68 , 215
k430 data 69 , 3 , 69 , 44 , 69 , 87 , 69 , 130 ,
69 , 172 , 69 , 215 , 70 , 0 , 70 , 43 , 70 , 86 ,
70 , 128
k440 data 70 , 171 , 70 , 214 , 71 , 0 , 71 , 41 ,
71 , 84 , 71 , 127 , 71 , 170 , 71 , 212 , 71 , 255 ,
72 , 40
k450 data 72 , 83 , 72 , 125 , 72 , 168 , 72 , 211 ,
72 , 254 , 73 , 40 , 73 , 83 , 73 , 124 , 73 , 168 ,
73 , 209
k460 data 73 , 252 , 74 , 39 , 74 , 81 , 74 , 124 ,
74 , 167 , 74 , 209 , 74 , 252 , 75 , 39 , 75 , 80 ,
75 , 124
k470 data 75 , 165 , 75 , 208 , 75 , 251 , 76 , 37 ,
76 , 80 , 76 , 123 , 76 , 165 , 76 , 208 , 76 , 251 ,
77 , 38
k480 data 77 , 80 , 77 , 123 , 77 , 164 , 77 , 208 ,
77 , 249 , 78 , 36 , 78 , 79 , 78 , 121 , 78 , 164 ,
78 , 207
k490 data 78 , 250 , 79 , 36 , 79 , 79 , 79 , 122 ,
79 , 164 , 79 , 207 , 79 , 250 , 80 , 35 , 80 , 79 ,
80 , 122
k500 data 80 , 163 , 80 , 207 , 80 , 250 , 81 , 35 ,
81 , 79 , 81 , 120 , 81 , 163 , 81 , 207 , 81 , 248 ,
82 , 35
k510 data 82 , 79 , 82 , 120 , 82 , 163 , 82 , 207 ,
82 , 248 , 83 , 35 , 83 , 78 , 83 , 120 , 83 , 163 ,
83 , 206
k520 data 83 , 248 , 84 , 35 , 83 , 253 , 84 , 121 ,
84 , 162 , 84 , 206 , 84 , 249 , 85 , 35 , 85 , 78 ,
85 , 121
k530 data 85 , 163 , 85 , 206 , 85 , 249 , 86 , 35 ,
86 , 78 , 86 , 121 , 86 , 162 , 86 , 206 , 86 , 249 ,
87 , 34
k540 data 87 , 78 , 87 , 121 , 87 , 162 , 87 , 206 ,
87 , 249 , 88 , 34 , 88 , 78 , 88 , 121 , 88 , 162 ,
88 , 206
k550 data 88 , 247 , 89 , 34 , 89 , 77 , 89 , 119 ,
89 , 162 , 89 , 205 , 89 , 248 , 90 , 34 , 90 , 77 ,
90 , 120
k560 data 90 , 162 , 90 , 205 , 90 , 248 , 91 , 34 ,
91 , 77 , 91 , 120 , 91 , 161 , 91 , 205 , 91 , 248 ,
92 , 33
k570 data 92 , 77 , 92 , 118 , 92 , 161 , 92 , 205 ,
92 , 246 , 93 , 33 , 93 , 76 , 93 , 118 , 93 , 161 ,
93 , 204
k580 data 93 , 246 , 94 , 33 , 94 , 76 , 94 , 117 ,
94 , 161 , 94 , 202 , 94 , 245 , 95 , 33 , 95 , 74 ,
95 , 117
k590 data 95 , 160 , 95 , 202 , 96 , 88 , 96 , 32 ,
96 , 84 , 96 , 117 , 96 , 158 , 96 , 201 , 96 , 244 ,
97 , 30
k600 data 97 , 73 , 97 , 116 , 97 , 157 , 97 , 201 ,
97 , 242 , 98 , 29 , 98 , 72 , 102 , 90 , 98 , 157 ,
98 , 200
k610 data 98 , 241 , 99 , 29 , 99 , 70 , 99 , 113 ,
99 , 156 , 99 , 198 , 99 , 241 , 100 , 26 , 100 , 70 ,
100 , 111
k620 data 100 , 154 , 100 , 197 , 100 , 239 , 105 , 2 ,
101 , 67 , 101 , 110 , 101 , 153 , 101 , 195 , 101 , 238 ,
102 , 23
k630 data 102 , 66 , 102 , 109 , 102 , 151 , 102 , 194 ,
102 , 235 , 103 , 22 , 103 , 64 , 103 , 107 , 103 , 148 ,
103 , 191
k640 data 103 , 234 , 104 , 19 , 104 , 63 , 104 , 104 ,
104 , 147 , 104 , 190 , 104 , 232 , 105 , 17 , 105 , 60 ,
105 , 103
k650 data 105 , 144 , 105 , 187 , 105 , 229 , 106 , 16 ,
106 , 57 , 106 , 100 , 106 , 141 , 106 , 184 , 106 , 226 ,
107 , 13
k660 data 107 , 54 , 107 , 97 , 107 , 138 , 107 , 182 ,
107 , 223 , 108 , 10 , 108 , 51 , 108 , 94 , 108 , 135 ,
108 , 94
k670 data 108 , 220 , 109 , 7 , 109 , 48 , 109 , 91 ,
109 , 132 , 109 , 175 , 109 , 216 , 110 , 3 , 110 , 44 ,
110 , 86
k680 data 110 , 129 , 110 , 172 , 110 , 213 , 111 , 0 ,
111 , 0 , 111 , 41 , 111 , 84 , 111 , 167 , 111 , 210 ,
111 , 251
k690 data 112 , 38 , 112 , 79 , 112 , 122 , 81 , 99 ,
112 , 204 , 112 , 247 , 113 , 32 , 113 , 75 , 113 , 117 ,
113 , 158
k700 data 113 , 201 , 113 , 242 , 114 , 29 , 114 , 70 ,
114 , 113 , 114 , 154 , 114 , 195 , 114 , 238 , 115 , 23 ,
115 , 66
k710 data 115 , 107 , 115 , 148 , 115 , 191 , 115 , 232 ,
116 , 18 , 116 , 61 , 116 , 101 , 113 , 111 , 116 , 186 ,
116 , 227
k720 data 117 , 12 , 117 , 55 , 117 , 96 , 117 , 137 ,
117 , 180 , 117 , 221 , 118 , 6 , 118 , 49 , 118 , 90 ,
118 , 133
k730 data 118 , 174 , 118 , 215 , 119 , 2 , 119 , 43 ,
119 , 84 , 119 , 125 , 119 , 168 , 119 , 209 , 119 , 250 ,
120 , 37
k740 data 120 , 77 , 120 , 119 , 120 , 161 , 120 , 202 ,
120 , 243 , 121 , 30 , 121 , 71 , 121 , 112 , 121 , 153 ,
121 , 196
k750 data 121 , 237 , 122 , 22 , 122 , 63 , 122 , 106 ,
122 , 147 , 122 , 188 , 122 , 229 , 123 , 16 , 123 , 57 ,
123 , 97
k760 data 123 , 140 , 123 , 181 , 123 , 222 , 124 , 7 ,
124 , 48 , 124 , 89 , 124 , 132 , 124 , 173 , 124 , 213 ,
125 , 0
k770 data 125 , 40 , 125 , 82 , 125 , 124 , 125 , 164 ,
125 , 206 , 125 , 246 , 126 , 33 , 126 , 73 , 126 , 115 ,
126 , 155
k780 data 126 , 197 , 126 , 238 , 127 , 24 , 127 , 188 ,
127 , 106 , 127 , 146 , 127 , 188 , 127 , 229 , 128 , 15 ,
128 , 55
k790 data 128 , 97 , 128 , 137 , 128 , 179 , 128 , 219 ,
129 , 5 , 129 , 46 , 129 , 86 , 129 , 128 , 129 , 168 ,
129 , 210
k800 data 129 , 250 , 130 , 36 , 130 , 76 , 130 , 118 ,
130 , 159 , 130 , 199 , 130 , 241 , 131 , 25 , 131 , 67 ,
131 , 107
k810 data 131 , 149 , 131 , 189 , 131 , 231 , 132 , 15 ,
132 , 55 , 132 , 97 , 132 , 137 , 132 , 178 , 132 , 220 ,
133 , 4
k820 data 133 , 45 , 133 , 86 , 133 , 126 , 133 , 168 ,
133 , 208 , 133 , 248 , 134 , 34 , 134 , 74 , 134 , 116 ,
134 , 156
k830 data 134 , 196 , 134 , 238 , 135 , 22 , 135 , 62 ,
135 , 104 , 135 , 144 , 135 , 184 , 135 , 226 , 136 , 10 ,
136 , 50
k840 data 136 , 92 , 136 , 132 , 136 , 183 , 136 , 213 ,
136 , 254 , 137 , 37 , 137 , 79 , 137 , 120 , 137 , 159 ,
137 , 201
k850 data 137 , 241 , 138 , 25 , 138 , 65 , 138 , 107 ,
138 , 147 , 138 , 187 , 138 , 227 , 139 , 11 , 139 , 53 ,
139 , 92
k860 data 139 , 134 , 143 , 150 , 139 , 214 , 139 , 254 ,
140 , 38 , 140 , 80 , 140 , 120 , 140 , 160 , 140 , 200 ,
137 , 9
k870 data 137 , 49 , 141 , 65 , 141 , 105 , 141 , 145 ,
141 , 185 , 141 , 227 , 142 , 10 , 142 , 50 , 142 , 90 ,
142 , 132
k880 data 142 , 172 , 142 , 212 , 142 , 251 , 143 , 35 ,
143 , 77 , 143 , 117 , 143 , 157 , 143 , 196 , 143 , 236 ,
144 , 22
k890 data 144 , 60 , 144 , 101 , 144 , 142 , 144 , 181 ,
144 , 221 , 145 , 5 , 145 , 45 , 145 , 86 , 145 , 126 ,
145 , 166
k900 data 145 , 206 , 145 , 245 , 146 , 29 , 146 , 69 ,
146 , 109 , 146 , 150 , 146 , 190 , 146 , 230 , 147 , 14 ,
147 , 53
k910 data 147 , 93 , 147 , 133 , 147 , 172 , 147 , 212 ,
147 , 252 , 148 , 36 , 148 , 77 , 148 , 117 , 140 , 203 ,
148 , 196
k920 data 148 , 236 , 149 , 20 , 117 , 252 , 149 , 99 ,
118 , 75 , 149 , 179 , 149 , 218 , 150 , 2 , 150 , 42 ,
119 , 17
k930 data 150 , 121 , 150 , 161 , 150 , 200 , 150 , 240 ,
151 , 23 , 151 , 63 , 151 , 103 , 151 , 142 , 151 , 182 ,
151 , 222
k940 data 152 , 5 , 152 , 45 , 152 , 84 , 152 , 124 ,
152 , 164 , 152 , 203 , 152 , 252 , 153 , 27 , 153 , 66 ,
153 , 106
k950 data 153 , 146 , 153 , 185 , 153 , 225 , 154 , 8 ,
154 , 46 , 154 , 87 , 154 , 125 , 154 , 166 , 154 , 204 ,
154 , 244
k960 data 155 , 27 , 155 , 66 , 155 , 106 , 155 , 146 ,
155 , 185 , 155 , 225 , 156 , 8 , 156 , 48 , 156 , 87 ,
156 , 125
k970 data 156 , 164 , 156 , 204 , 156 , 243 , 157 , 27 ,
157 , 67 , 157 , 106 , 157 , 145 , 157 , 183 , 157 , 222 ,
158 , 6
k980 data 158 , 45 , 158 , 85 , 158 , 124 , 158 , 162 ,
158 , 203 , 158 , 241 , 159 , 24 , 159 , 61 , 159 , 103 ,
159 , 141
k990 data 159 , 100 , 159 , 219 , 160 , 3 , 160 , 42 ,
160 , 82 , 160 , 121 , 160 , 159 , 160 , 198 , 160 , 238 ,
161 , 21
[/font]
http://www.emesystems.com/thc4scm.gif
http://www.emesystems.com/OWL2face.htm#THC4
>Hey:
>
>Great info I have a similar problem however I was wondering in
>regards to measuring more than one thermocouple. would putting the
>different thermocouples through a multiplexer be okay or would you
>suggest that I use 4 independant ad594's then feed those voltages
>into an ADC0834. Or is there a different way to do this I would
>greatly value any input
>
>Thank you
>Aaron
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
block is needed to keep all your t/c wire to copper connections at a like
temperature. I believe that's what Tracy's (excellent) documentation refers
to as the 'reference'. What material you use, and the environment it will be
mounted in should dictate the design. Even a simple block makes the need for
s/w calibration much less and simpler.
BTW, has anyone used the AD594/5' sensor break feature in a multiplexed
application?
Also a good catch by Tracy, the 595 is trimmed for type K, while the 594 is
for JTC's.
(I think I just used up my compliments for the day!!!)
Chris
>
Original Message
> From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ilg8DB129bv2IEXOrSHRynf8JEZAtJ2sn7mcmNvsuSHS5SKcyY-Yls0FLWgfuzjZZewS3ViNQavLKg]tracy@e...[/url
> Sent: Monday, May 28, 2001 4:47 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Temperature control with a stamp
>
>
> Here is an AD595 with a multiplexer:
>
> http://www.emesystems.com/thc4scm.gif
> http://www.emesystems.com/OWL2face.htm#THC4
>
>
>
> >Hey:
> >
> >Great info I have a similar problem however I was wondering in
> >regards to measuring more than one thermocouple. would putting the
> >different thermocouples through a multiplexer be okay or would you
> >suggest that I use 4 independant ad594's then feed those voltages
> >into an ADC0834. Or is there a different way to do this I would
> >greatly value any input
> >
> >Thank you
> >Aaron
> >
> >
> >
> >
> >Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
Well I've taken alook at the datasheets for these products and they
look like exactly what I need however I can't seem to find anybody
online who has then in stock. i'm kinda new to hunting down chips but
I tried all the major ones (radio Shack, DigiKey, and SEI) but only
SEI said it was possible to order and I would have to buy 25. Any
help would be greatly appreciated.
Thank You
Aaron
--- In basicstamps@y..., Tracy Allen <tracy@e...> wrote:
> Here is an AD595 with a multiplexer:
>
> http://www.emesystems.com/thc4scm.gif
> http://www.emesystems.com/OWL2face.htm#THC4
>
>
>
> >Hey:
> >
> >Great info I have a similar problem however I was wondering in
> >regards to measuring more than one thermocouple. would putting the
> >different thermocouples through a multiplexer be okay or would you
> >suggest that I use 4 independant ad594's then feed those voltages
> >into an ADC0834. Or is there a different way to do this I would
> >greatly value any input
> >
> >Thank you
> >Aaron
> >
> >
> >
> >
> >Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
I don't know what chips you are looking for, but goto
http://www.findchips.com/
Ray McArthur
Original Message
From: Aaron <snazzyguy2@y...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, May 30, 2001 12:34 AM
Subject: [noparse][[/noparse]basicstamps] Re: Temperature control with a stamp
> Hello:
>
> Well I've taken alook at the datasheets for these products and they
> look like exactly what I need however I can't seem to find anybody
> online who has then in stock. i'm kinda new to hunting down chips but
> I tried all the major ones (radio Shack, DigiKey, and SEI) but only
> SEI said it was possible to order and I would have to buy 25. Any
> help would be greatly appreciated.
>
They are free [noparse]:)[/noparse]
--- In basicstamps@y..., "Aaron" <snazzyguy2@y...> wrote:
> Hello:
>
> Well I've taken alook at the datasheets for these products and they
> look like exactly what I need however I can't seem to find anybody
> online who has then in stock. i'm kinda new to hunting down chips
but
> I tried all the major ones (radio Shack, DigiKey, and SEI) but only
> SEI said it was possible to order and I would have to buy 25. Any
> help would be greatly appreciated.
>
> Thank You
> Aaron
>
>
> --- In basicstamps@y..., Tracy Allen <tracy@e...> wrote:
> > Here is an AD595 with a multiplexer:
> >
> > http://www.emesystems.com/thc4scm.gif
> > http://www.emesystems.com/OWL2face.htm#THC4
> >
> >
> >
> > >Hey:
> > >
> > >Great info I have a similar problem however I was wondering in
> > >regards to measuring more than one thermocouple. would putting
the
> > >different thermocouples through a multiplexer be okay or would
you
> > >suggest that I use 4 independant ad594's then feed those voltages
> > >into an ADC0834. Or is there a different way to do this I would
> > >greatly value any input
> > >
> > >Thank you
> > >Aaron
> > >
> > >
> > >
> > >
> > >Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/