Water Detect click
PID: MIKROE-2786
Avoid plumbing and water leakage disasters
Water Detect click
is used for detecting water and other electroconductive liquids. If the
detection area is wet the output of Microchip's
MCP606
CMOS op-amp will go positive,
signaling the presence of liquid.
Water Detect click can be used as a household flood alarm sensor, rain detector for smart
buildings or for water tanks that act as a limit switch for a pump.
You could use it on one of our clicker 2 development boards, with GSM 4 click, or any
other from the wireless range, and create a home flood alarm. Any time Water Detect click
detects water it will send you an SMS.
How the click works
Water Detect click works by comparing the voltage of two resistor dividers using the MCP606
comparator. The resistor divider (made of R2 and R3) is used as a voltage reference.
The MCP606 functions as a comparator on this click board™.
The second divider is made of resistor R1 and the sensory area. When the sensory area is dry, it's
resistance is near infinite, and the voltage applied to the inverting terminal of the comparator
equals VCC.
Since the voltage of the reference divider connected to the non-inverting input is VCC/2, the
output of the comparator is at zero voltage. Once the liquid is present at the sensory area, it's
resistance drops and pulls the voltage on the inverting input of the comparator toward zero volts.
Once this voltage falls below VCC/2, the comparator output swings toward VCC signaling the
presence of liquid. The comparator output is tied to the INT pin on the mikroBUS™ header.
The water detection area is actually made of exposed conducting wires - simple but effective
technology.
Specifications
Type
Applications
On-board
modules
Interface
Various
Household flood alarm sensor, rain detector for smart buildings or
water tank fill sensor, automated watering systems, etc.
Water detection area, MCP606 comparator
GPIO
Input Voltage
Click board size
3.3V or 5V
L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on
Water Detect click
corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
NC
NC
NC
NC
NC
NC
Power
supply
Ground
+3.3V
GND
1
2
3
4
5
6
7
8
AN
RST
CS
SCK
MISO
MOSI
3.3V
GND
PWM
INT
TX
RX
SCL
SDA
5V
GND
16
15
14
13
12
11
10
9
Pin
NC
INT
NC
NC
NC
NC
+5V
GND
Power supply
Ground
MCP606 output (water
detect)
Notes
Jumpers and settings
Designator Name
Default
Position
Default
Option
Description
Power Supply Voltage Selection between
3.3V/5V, left position 3.3V, right position
5V
VCC SEL
VCC
SEL
Left
3.3V
Software Support
We provide a library that reads the status of the click output (INT pin) when water is detected, as
well as an example application that, when this happens, sends the message “Water detected!” on
the microcontroller UART. The library and the example run on all the MikroElektronika
compilers and main development boards; you can download both on LibStock.
Note: depending on the development board you are using, you may need the RS232 click or
USB-UART click, to connect to your PC. The terminal available in all Mikroelektronika
compilers, or any other of your choice, can be used to read the message.
Library Description
The library implements GPIO HAL and one function which checks the state of the INT pin.
Key functions:
uint8_t WDETECT_getStatus()
- Returns water detection status
Demo application description
The demo application is composed of three sections :
System Initialization - Initializes GPIO and UART used for logging
Application Initialization - Initializes Library GPIO HAL
Application Task - (code snippet) Constantly polling INT pin
using
WDETECT_getStatus()
if water is detected it sends a message to UART. It uses
the
getINT()
function which returns the state of INT pin.
void
applicationTask()
{
if
(WDETECT_getStatus())
{
UART1_Write_text("Water
Detected!");
UART1_Write(13);
UART1_Write(10);
}
}
Other MikroElektronika Libraries used in this demo application:
UART
The full application code and libraries are available for download on our LibStock page
https://shop.mikroe.com/water-detect-click 11-3-17
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