how to communicate PIC with Liquid Level Sensor ??anyone??

[lolo]

i have purchase liquid level sensor and PIC combo kit
-how to connect it with the PIC

[hyng]

The sample circuit is shown in the datasheet. Please refer to the Simple Voltage Divider Circuit section. The centre pin is inactive, thus use only 1st and 3rd pin and there is no polarity. Actually it works like a simple LDR (Light Dependent Resistor), LDR changes resistance against light; this sensor changes resistance against liquid level. You can refer to our tutorial of SK40C:Project 9 – Analog Sensor: Light detection using LDR http://tutorial.cytron.com.my/2011/08/10/project-9-%E2%80%93-analog-sensor-light-detection-using-ldr/

[lolo]

do i need to build another circuit for this to work?

[yonghui]

hi,

hyng described the circuit quite clearly,

u will need to buid a basic voltage divider circuit. connect it to the same voltage level as the PIC, then use the ADC module of the PIC to read the voltage from the divider circuit. the resistance of the sensor will change according the the liquid level, thus this cause the voltage over the terminal of the sensor will change according to the liquid level. ADC will read/ sample the voltage level of the sensor and u can get the digital reading from that. u will probably need to read on how to use the adc of the PIC.


regards.
yh

[lolo]

what exactly component at the circuit do i need?having a trouble here.tq

[robosang]

what exactly component at the circuit do i need?having a trouble here.tq

I doubt you understand what is electronics at all Though I din go into the datasheet pointed by other forumers, looking at what explained by yonghui, it is basically a normal voltage dividing circuit. Googling help me get this at Wikipedia - Voltage Divider.


What component do you need? A resistor as R1, R2 will most probably be the sensor. When R2 changes, Vout changes. From there you get the information.

[ober]

robosang is pointing to right direction. Though there are plenty more of method to use the sensor, if you have microcontroller and the microcontroller have ADC, the simplest method is to use resistor ladder to get voltage divider as shown in the datasheet of the sensor. You can also refer to one of our tutorial, using the LDR, Project 9