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TITLE. DATE $Date: 2004/08/14 $. $Revision: 1.4 $. Dafydd Walters sonar_array_module.sch. Sonar Array Module. 3. 2. 4. 1
Plus5V Power
4
3
SRF04 Ultrasonic Range Finder Current 30mA Typ. 50mA Max
ground
1
2
trigger
+5V
echo
4
3
2
trigger
Sonar Modules
CONN16 Sonar 16
ground
1
+5V
echo
4
3
CONN15 Sonar 14
ground
2
1
echo
+5V
trigger
4
3
2
1
CONN14 Sonar 12
ground
trigger
+5V
echo
4
3
2
1
CONN13 Sonar 10
ground
trigger
+5V
echo
4
3
2
1
CONN12 Sonar 8
ground
trigger
+5V
echo
4
3
2
1
CONN11 Sonar 6
ground
trigger
+5V
echo
4
3
2
trigger
CONN10 Sonar 4
ground
echo
+5V
1
CONN9 Sonar 2
Frequency 40KHz Package 43mm x 20mm x 17mm height
3
1
3
47K
Q11 2N3904
2
1
Q12 2N3904
1
2 3
Q13 2N3904
R14 4K7 1
2
Q14 2N3904
2
3
3
R15 4K7 1
Q15 2N3904
Input Trigger 10uS Min. TTL level pulse
R16 4K7 1
2 3
Range Range 3cm − 3m
Sonar16Echo Signal Q16R16 Signal
Q10 2N3904
R13 4K7
Sonar14Echo Signal Q15R15 Signal
1
2
R12 4K7
Sonar12Echo Signal Q14R14 Signal
Q9 2N3904
2
R11 4K7
Sonar10Echo Signal Q13R13 Signal
1
R10 4K7
Sonar8Echo Signal Q12R12 Signal
R9 4K7
Sonar6Echo Signal Q11R11 Signal
Sonar4Echo Signal Q10R10 Signal
Q9R9 Signal
Sonar2Echo Signal
Q16 2N3904
Echo Pulse Positive TTL level signal, width proportional to range.
2 3
3
R19Out Power
R19
RC2:1 +5V
TI POWERTRENDS U2
RB0 Signal
RB1 Signal
RB2 Signal
RB3 Signal
RB4 Signal
RB5 Signal
RB6 Signal
RB7 Signal
3
OUT IN GND
Power Plus12V Fat
1
+12V ground
CONN17
RC5 Signal clock data
15
2
0.1uF
1
10uF
RC3
RC1:1
RC3 Signal
clock data ground
Y1
2
+5V
14
RC2 13
RC1 12
RC0
10
11
CLKIN
CLKOUT
Vss
9
8
RA5 7
RA5 Signal
RA4 6
R20Out Power
RA3 5
RA3 Signal
RA2 4
RA2 Signal
RA1 3
RA1 Signal
RA0 2
RA0 Signal
MCLR 1
R17Out Power
PIC16F876
RC2:1
C3 2
C4
+5V
3
CONN19 I2C
1
1
RC4
16 RC5
17 RC6
18
19 Vss
RC7
RB0
Vdd
20
21
22 RB1
RB2
23
24 RB3
RB4
25
26 RB5
27 RB6
RB7
28
ground
10K
2
7805 2
RC6 Signal
RC4 Signal
U1
1
3 2 1
4MHz CONN18
R17
I2C
4K7 +5V
R20 RC1:1 47K
R18Out Power
R18
CONN3
15pF
15pF
ground
trigger
Sonar 13
Sonar 15
CONN7
CONN8
4
3
4
+5V
ground
trigger
4K7 R8
echo
1
Q8R8 Signal
2
2
1
Q8 2N3904
4K7 R7
+5V
ground 4
3
trigger
echo
+5V 4
2
Sonar 11 CONN6
Q7R7 Signal
3
1
1
ground 3
Sonar 9 CONN5
2
2
Q7 2N3904
echo
Q6R6 Signal
C2
3
1
2
4K7 R6
trigger
echo
3
1
2
4
Q6 2N3904
4K7 R5
+5V
ground
trigger
Q5R5 Signal
2
1
Sonar 7 CONN4
3
1
Q5 2N3904
4K7 R4
3
4
Sonar 5
CONN2
Q4R4 Signal
+5V
ground 3
trigger
echo
+5V
1
4
2
ground
2
1
4K7 R3
Sonar 3
CONN1
Q4 2N3904
echo
Q3R3 Signal
3
2
2
1
3
1
4
Sonar 1
3
1
Q3 2N3904
4K7 R2
+5V
ground
trigger
Q2R2 Signal
trigger
2
1
3
1
3
echo
Q2 2N3904
4K7 R1
+5V
1
Q1R1 Signal
2
2
echo
Q1 2N3904
3
2
3
C1
DESIGNER’S NOTES Description The Devantech SRF04 range finder provides precise non−contact distance measurement Your controller only has to time the length of the echo pulse to find the range.
Usage You only need to supply a short 10uS pulse to the trigger input to start the ranging.
URLs The echo line is therefore a pulse whose width is proportional to the distance
The SRF04 will send out an 8 cycle burst
of ultrasound at 40khz and raise its echo line high. It then listens for an echo
and as soon as it detects one
it lowers the echo line again.
By timing the pulse it is possible to calculate the range in inches/centimeters
