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document example load cell amplifier gain resistor values in schematic
author
Bdale Garbee
<bdale@gag.com>
Sat, 13 May 2017 15:48:41 +0000
(09:48 -0600)
committer
Bdale Garbee
<bdale@gag.com>
Sat, 13 May 2017 15:48:41 +0000
(09:48 -0600)
telefiretwo.sch
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diff --git
a/telefiretwo.sch
b/telefiretwo.sch
index bcf0aed30078bf37dd4390b5e97bd9485941fc28..ebbdebc8f9e23f385ceba29bd7cb538a59b4e815 100644
(file)
--- a/
telefiretwo.sch
+++ b/
telefiretwo.sch
@@
-1932,9
+1932,12
@@
N 71900 66500 71800 66500 4
L 72800 69300 72500 69300 3 0 0 0 -1 -1
L 72500 69300 72500 68900 3 0 0 0 -1 -1
L 72500 68900 72800 68900 3 0 0 0 -1 -1
L 72800 69300 72500 69300 3 0 0 0 -1 -1
L 72500 69300 72500 68900 3 0 0 0 -1 -1
L 72500 68900 72800 68900 3 0 0 0 -1 -1
-T 7
3800 64700 9 10 1 0 0 0 2
+T 7
1800 64500 9 10 1 0 0 0 5
R106 sets gain, see INA125
R106 sets gain, see INA125
-data sheet to pick value
+data sheet to pick value.
+
+2mV/V load cell needs gain of 500, or 121 ohms
+3mV/V load cell needs gain of 333 or 182 ohms
T 80900 68400 9 10 1 0 0 0 2
adjust output to
3.3V ADC input
T 80900 68400 9 10 1 0 0 0 2
adjust output to
3.3V ADC input