TDS (Total Dissolved Solids) indicates how many milligrams of soluble solids are dissolved in one liter of water. In general, the higher the TDS value, the more soluble solids are dissolved in water, and the less clean the water is. Therefore, the TDS value can be used as one reference point for reflecting the cleanliness of water.
TDS Sensor detects the Total Dissolved Solids (TDS) levels in the water which can be used to indicate the water quality. These Sensors can be applied in water quality applications such as TDS meter, well water, aquarium, hydroponics, etc.
GebraBit TDS module
GebraBit TDS module indicates how many milligrams of soluble solids are dissolved in one liter of water. This module is capable of using 3V3 and 5V Supply Voltages that users can easily select with considered onboard jumper select. This feature helps to use a wide range of microcontrollers for interfacing with this module.
To access the output data, it is enough to put the GebraBit TDS module in the BreadBoard, then by applying the proper voltage set up the GebraBit TDS module with any of Arduino, Raspberry Pi, Discovery board, and especially we recommend using GebraBit microcontroller development modules (GebraBit STM32F303 or GebraBit ATMEGA32 module) then receive the data.
The reason for our recommendation when setting up the GebraBit TDS module with GebraBit microcontroller development modules (such as GebraBit STM32F303 or GebraBit ATMEGA32), is the presence of a 3V3 regulator and the compatibility of the pin order of all GebraBit modules together (GEBRABUS standard), it’s enough to Put the GebraBit TDS module in the corresponding socket and develop the desired sensor module without the need for wiring.
GebraBit TDS module Key Features
- Selectable module power supply voltage between 3V3 and 5V
- On Board, ON/OFF LED indicator
- GEBRABIT Pin Compatible with GEBRABUS
- GEBRABIT small package
- It can be used as a daughter board of GEBRABIT MCU Modules
- Featuring Castellated pad (Assembled as SMD Part)
- Separatable screw parts to reduce the size of the board
Introduction of module sections
Connector
A header Pin is used to connect the sensor probe to the module, which is placed on top of the module.
CD4060 IC
This IC is responsible for generating the AC signal for the probe first plate.
LMV32 op amp
In the GebraBit TDS circuit, a LMV32 op-amp is used as a buffer and to isolate the CD4060 output.
LM1117 regulator
In the design of the GebraBit TDS module, an LM1117 regulator is used to supply the working voltage of the LMV32 op-amp.
LM2660 convertor
In the GebraBit TDS module, a LM2660 convertor is used to produce the negative power supply of op-amps.
VCC SEL
According to the state of 0R resistance of this jumper, the sensor supply voltage is selected between 5V and 3V3.
Power LED
According to the status of the module power selector jumper and by applying voltage to the module through the corresponding pin, the LED of the module turns on.
GebraBit TDS Module pins
Supply pins
- 3V3 and 5V: These pins can supply the power supply of the sensor circuit according to the state of the power voltage selector jumper.
- 2V5: users can use this pin to supply power to LMV324.
- GND: This is the ground pin for powering the sensor.
Output pin
- AO: This pin is used to receive the analog output of the module and outputs the TDS value as an analog voltage.
Other pins
- FEQ: The generated frequency is provided to the user through this pin.
Connect to the processor
Connection with GebraBit STM32F303
Due to the compatibility of the pin order of GebraBit modules with each other (GEBRABUS standard), to start the GebraBit TDS module with GebraBit STM32F303 microcontroller module, it is enough to easily place the GebraBit TDS module as pin to pin on the GebraBit STM32F303 module and start the module by applying voltage. Here, for better understanding, the separate connection of these two modules is shown:
Connection with GebraBit ATMEGA32A
Due to the compatibility of the pin order of GebraBit modules with each other (GEBRABUS standard), to start the GebraBit TDS module with the GebraBit ATMEGA32A microcontroller module, it is enough to easily place the GebraBit TDS module as pin to pin on the GebraBit ATMEGA32A module and start the module by applying voltage. Here, for better understanding, the separate connection of these two modules is shown:
Note: If you use GebraBit microcontroller modules, make sure that the VCC SEL selector jumper of GebraBit TDS module is set to “3V3” so that you can easily get “3V3” voltage from the microcontroller module.
Connection with ARDUINO UNO
Follow the steps below to connect the GebraBit TDS module to ARDUINO UNO:
- Connect the “5V” pin of the TDS module to the “5V” pin of the ARDUINO UNO board output (red wire).
- Connect the “GND” pin of the TDS module to the “GND” pin of the ARDUINO UNO board. (Black wire)
- Connect the “AO” pin of the TDS module to one of the ARDUINO UNO board analog pins (orange wire).
How to connect the above mentioned steps can be seen in this picture: