FlowSensor Hall YF-B10 (YF-B1, YF-B2, YF-B3)

Specification:

Function: Sensor, flow control
Thread size: Male 1"
Size: 58mm L
Color: Gold color
Flow Rate:2~50L/min
Flow Pulse: (6 * Q-8) Q = L/Min ± 5%
max. Working Current: 15mA (DC5V)
Min. Operating: DC 5V
Working voltage: DC7v-24v
Charging power: = 10 mA (DC 5 V)
Operational Working Temperature: -25 degrees celsius to +60 degrees celsius
Liquid Temperature: 60
Accuracy: 5% ~ 10%
Pressure: > 1.75MPa

wiring Wemos D1

The pins D5, D6, D7 work without restrictions
D3 and D4 work, but can not be low on boot, otherwise the WEMOS freezes
D1 and D2 are used for I²C by default, not changed for compability
D04 and D85 have no support for interrupts

Red = 5V
Yellow = PIN D5
Black = GND

Calibration table;

I used this meter for calibration. Below 2 liter/minute it is not reliable anymore.
For the YF-B1(DN15) you can use the same factor(7.7)

Output;
Flow rate: 21.76 L/min