Datasheet

r 0.2
The Atlas Scientific Gravity
™
Analog pH Sensor / Meter is a low-cost solution specifically
designed for
• Students / education
• Proof of concept designs
• Moderate accuracy applications
Connection pins
Connect – to GND
Connect + to 3.3V or 5V
Connect to analog pin / ADC
pH Meter V2.1
Gravity
A
+
−
13
12
11
10
9
8
7
6
5
4
3
2
L
5V
A0
ANALOG IN
AREF
1
GND
TX
RX
RESET
3V3
A1
A2
A3
A4
A5
VIN
GND
GND
DIGITAL (PWM=
)
Arduino
TM
IOREF
ICSP
ICSP2
ON
POWER
0
1
TX0
RX0
RESET
A
r
d
u
i
n
o
M
E
G
A
w
w
w
.
a
r
d
u
i
n
o
.
c
c
AREF
GND
13
12
11
10
9
8
7
6
5
4
3
2
T
X
1
R
X
0
0
1
2
3
4
5
6
7
RESET
3V3
8
9
1
0
1
1
1
2
1
3
1
4
1
5
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
31
33
35
37
39
41
43
45
47
49
51
53
TX3 14
RX3 15
TX2 16
RX2 17
TX1 18
RX1 19
SDA 20
SCL 21
PWM
PWR
DIGITAL
ANALOG IN
COMMUNICATION
5V
GND
G
N
D
VIN
I
C
S
P
1
pH Meter V2.1
Gravity
A
+ −
pH Meter V2.1
Gravity
A
+ −
Arduino UNO
Arduino MEGA
13
12
11
10
9
8
7
6
5
4
3
2
L
5V
A0
ANALOG IN
AREF
1
GND
TX
RX
RESET
3V3
A1
A2
A3
A4
A5
VIN
GND
GND
DIGITAL (PWM=
)
Arduino
TM
IOREF
ICSP
ICSP2
ON
POWER
0
1
TX0
RX0
RESET
A
r
d
u
i
n
o
M
E
G
A
w
w
w
.
a
r
d
u
i
n
o
.
c
c
AREF
GND
13
12
11
10
9
8
7
6
5
4
3
2
T
X
1
R
X
0
0
1
2
3
4
5
6
7
RESET
3V3
8
9
1
0
1
1
1
2
1
3
1
4
1
5
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
31
33
35
37
39
41
43
45
47
49
51
53
TX3 14
RX3 15
TX2 16
RX2 17
TX1 18
RX1 19
SDA 20
SCL 21
PWM
PWR
DIGITAL
ANALOG IN
COMMUNICATION
5V
GND
G
N
D
VIN
I
C
S
P
1
pH Meter V2.1
Gravity
A
+ −
pH Meter V2.1
Gravity
A
+ −
Raspberry Pi
A Raspberry Pi cannot
read analog signals.
pH Meter V2.1
Gravity
A
+ −
3
Copyright © Atlas Scientific LLC