document example load cell amplifier gain resistor values in schematic

[hw/telefireone] / telefiretwo.sch

diff --git a/telefiretwo.sch b/telefiretwo.sch
index 6019e0e9515ccb4aec24d67688de3d53b60e6193..ebbdebc8f9e23f385ceba29bd7cb538a59b4e815 100644 (file)
--- a/telefiretwo.sch
+++ b/telefiretwo.sch
@@ -1493,23 +1493,6 @@ value=NoConnection
 T 50700 61300 5 10 0 0 0 0 1
 device=DRC_Directive
 }
-C 50600 61800 1 0 0 conn-2.sym
-{
-T 50905 62445 5 10 1 1 0 0 1
-refdes=J1
-T 50600 61800 5 10 0 1 0 0 1
-footprint=100mil2pin
-T 50600 61800 5 10 0 1 0 0 1
-loadstatus=noload
-T 50600 61800 5 10 0 1 0 0 1
-device=CONNECTOR
-}
-N 50600 62300 50600 63400 4
-N 50600 63400 49700 63400 4
-{
-T 49700 63500 5 10 1 1 0 0 1
-netname=v_ldo_in
-}
 C 70800 47600 1 0 0 CC1200.sym
 {
 T 71200 54600 5 10 1 1 0 0 1
@@ -1949,9 +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
-T 73800 64700 9 10 1 0 0 0 2
+T 71800 64500 9 10 1 0 0 0 5
 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