1. Legs Conditioning Platform
+7 / +15 V +
22 mf
2.2mf 5V
LM7805 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10
PIC18F1320
B3 /AN1/CCP1
B2/INT2
A7/Osc1
A6/Osc2
VDD
B7/PGD
B6/PGC B5
B4/AN6/RX
A0 /AN0
A1 /AN1
A4 /AN4
MCLR/RA5/Vpp
VSS
A2/AN2
A3/AN3
B0/AN4/INT0
B1/AN5/TXINT1
100 nf
RS232 Connector
Straight Gauge An0
Curved Gauge An1
Accel. X An2
Accel. Y An3 5V
10K
CS Accel. DO
CLK
CS Strain
820 Ω 9 1
Straight Gauge An0
Curved Gauge An1
Accel. Y An2
Accel. X An3
Conditioned Output Connector
Virgilio Mattoli
Aug/24/04
BDML pag. 1/5
Leg Conditioning Platform
Vers. 1.0

2. Legs Conditioning Platform_ +
X 10
LM6152(1/2) 5V
10K
Ref AMPs
LM6152 (1/2)
Ref DACs
Refernce Voltage
Leg Input Connector
Accel. Y Input
Curved Input 9 1
Accel. X Input
Straight Input 5V
100nf 5V
MAX 5154 1 2 3 4 16 15 14 13 5 6 7 8 12 11 10 9
CS Accel. DO
CLK
Accel. Y DAC OutPut
Accel. X DAC OutPut
Ref DACs
10K
DAC 5V
MAX 5154 1 2 3 4 16 15 14 13 5 6 7 8 12 11 10 9
CS Strain DO
CLK
Curved DAC OutPut
Straight DAC OutPut
Ref DACs
10K
DAC
Virgilio Mattoli
Aug/24/04
BDML pag. 2/5
Leg Conditioning Platform
Vers. 1.0

3. Legs Conditioning Platform
156 Ω
AD623
1 Rg
2 In -
3 In +
4 Vss
Rg 8
Vdd 7
Out 6
Ref 5
Straight Input
Ref AMPs
Straight DAC OutPut 5V
220nf
1,5K
Straight Gauge An0
G = X 642
156 Ω
AD623
1 Rg
2 In -
3 In +
4 Vss
Rg 8
Vdd 7
Out 6
Ref 5
Curved Input
Ref AMPs
Curved DAC OutPut 5V
220nf
1,5K
Curved Gauge An1
G = X 642
25K
AD623
1 Rg
2 In -
3 In +
4 Vss
Rg 8
Vdd 7
Out 6
Ref 5
Accel. Y Input
Ref AMPs
Accel. Y DAC OutPut 5V
220nf
1,5K
Accel. Y An2
G = X 5
25K
AD623
1 Rg
2 In -
3 In +
4 Vss
Rg 8
Vdd 7
Out 6
Ref 5
Accel. X Input
Ref AMPs
Accel. X DAC OutPut 5V
220nf
1,5K
Accel. X An3
G = X 5
Virgilio Mattoli
Aug/24/04
BDML pag. 3/5
Leg Conditioning Platform
Vers. 1.0

4. Legs Conditioning Platform
RS 232 CABLE
Serial RS232
DB9 Connector (Female) 1 2 3 4 5 6 7 8 9
PC-TX
PC-RX
PC-GND
Vcc
T1out
R1in
R1out
T1in
R2in
R2out
C1+ V+
C1-
C2+
C2- V-
T2out
T2in
MAX233 10 20 19 18 17 16 15 14 13 12 11
GND
PIC Tx
PIC Rx
Gnd
5V (In)
To RS232 Connector
Virgilio Mattoli
Aug/24/04
BDML pag. 4/5
Leg Conditioning Platform
Vers. 1.0

5. Legs Conditioning Platform
RS232 REMOTE CONTROL
Connection with standard RS232 protocol: 9600kbps, 1 stop bit, No handsk
Command PC -> Device
ASCII Chr “9” = 57 = START Acquisition Data
ASCII Chr “8” = 56 = STOP Acquisition Data
ASCII Chr “5” = 53 = Autozero Gauges
ASCII Chr “6” = 54 = Autozero Accelerometers
ASCII Chr “0” = 48 = Set DAC Straight Gauge = 2.5V
ASCII Chr “1” = 49 = Set DAC Curve Gauge = 2.5V
ASCII Chr “2” = 50 = Set DAC X Acc = 2.5V
ASCII Chr “3” = 51 = Set DAC Y Acc = 2.5V
Device -> Command PC
When received START command, device send acquired value for Gauges and Accelerometers:
Each value is four digit in hexadecimal representation (the first one is ever equal to zero), ranging form 0x0000 = 0V to 0X03FF = 5V .
The values are separated by tabulation (9 in ASCII). Each acquisition is separated by a carriage return (13, 10 in ASCII)
The order of rows is: Straight gauge value – TAB – Curve gauge value – TAB – Acc X value – TAB – Acc Y value – CR
The acquisition can be done configuring in suitable way the the Windows HyperTerminal
Virgilio Mattoli
Aug/24/04
BDML pag. 5/5
Leg Conditioning Platform
Vers. 1.0