pH Value (pH0-14) Digital Sensor Module BM25S4421-1
US$7.30
In stock
Quantity
11
pieces
Product ID
BM25S4421-1
The product is a pH detection module with a detection range of pH0~pH14. It includes a temperature sensor interface, allowing it to measure both pH and temperature simultaneously. The product has been calibrated at the factory. Its standout features include excellent power efficiency and high accuracy. Additionally, it offers two communication interfaces: I2C and UART, providing greater flexibility in usage. It is suitable for applications such as pen-type pH meters, portable pH detection devices, and fish tank pH value monitors.
Please note that the product does not come with a probe and a temperature sensor.
We recommend you use the product with the LeiCi E-201-C pH composite electrode probe and a 10k 3950 1% NTC thermistor.
You can configure the high or low alarm threshold for the product via the command. The alarm will be triggered when the detected pH value is higher or lower than the high/low alarm threshold. At this point, the INT pin level will change from high to low.
For instance, if the high alarm threshold is configured to pH12 and the low alarm threshold is configured to pH3, it means that the alarm will be triggered once the product detects the pH value is higher than pH12 or lower than pH3. It is recommended to set the high pH alarm threshold to be at least 0.08 higher than the low pH alarm threshold.
When the measured pH value is higher or lower than the threshold by 0.03, the product exits alarm mode.
Please note that the alarm function cannot be disabled.
HARDWARE OVERVIEW
PIN DESCRIPTION
Pin
Pin name
Function
1
GND
Ground
2
VDD
Power supply: 3V~5.5V
3
TX
SCL
UART: TX
I2C: clock line (integrated 4.7k pull-up resistor)
4
RX
SDA
UART: RX
I2C: data line (integrated 4.7k pull-up resistor)
5
INT
Alarm pin
⬥ Triggered: outputs low
⬥ Non-triggered: outputs high
