Grove Slide Potentiometer User manual

Grove - Slide Potentiometer
The Grove - Slide Potentiometer module incorporates a linear variable resistor with
a maximum resistance of 10KΩ. When you move the slider from one side to the
other, its output voltage will range from 0 V to the Vcc you apply. It connects to the
other Grove modules through a standard 4-Pin Grove Cable. Three of the pins are
connected to OUT (Pin 1), Vcc (Pin 3) and GND (Pin 4), while the fourth pin (Pin 2) is
connected to a on-board green indicator LED. The LED is used to visually represent
the resistance change on the potentiometer.
Features
o30 mm long slide length
oLinear resistance taper
oGrove compatible
Specifications
Item
Min
Typical
Max
Voltage (DC)
3.3V
5.0V
30V
Current
-
-
30mA
Dimension
24mm x60mm
Net Weight
8.6g
Rotational life
>15,000 cycles

Total
resistance
10KΩ
Stroke length
30mm
Total
resistance
tolerance
+/- 20%
Getting Started
As An Adjustable Resistor
As shown below, the Grove - Slide Potentiometer can be used as a simple slide
potentiometer in any MCU controlled or stand-alone project.
Standalone
Follow these steps to build a sample Grove circuit using this module but without
using any microcontroller board:
1. Connect the slide potentiometer module to the input side of your circuit (to the
left of the power module). On the output side of the circuit, you may use a
range of User Interface modules (Grove - Red LED, Grove - LED String
Light, Grove - Mini Fan, Grove - Buzzer, Grove - Recorder etc.)
2. Power up the circuit when complete.
3. The slide potentiometer module can now be used to trigger an output. For
example:
oWhen used in conjunction with a Grove - Red LED output module, observe
that the brightness of the LED increases as you move the slider from GND to
Vcc. At Vcc, the resistance of the potentiometer is minimum and the LED
burns the brightest. The same behavior can be seen when the slide
potentiometer is used with the Grove - LED String Light module - the more
voltage you apply by taking the slider towards the Vcc mark, the brighter the
LED lights would become.

oSimilarly, you can use the slide potentiometer to vary the speed of your Mini
Fan or the frequency with which your Grove - Buzzer module sounds
oThe slide potentiometer can also be used as an ON/OFF switch for any circuit.
Take the slider to the Vcc position to switch it ON and move it down to GND to
switch OFF a circuit.
In terms of choosing a power module, you can use either the Grove - USB
Power module or the Grove - DC Jack Powermodule for building standalone Grove
circuits.
With Arduino
As a Voltage Divider
Follow these simple steps to make the slide potentiometer module function as a
voltage divider:
1. When using the module in conjunction with an Arduino or a Seeeduino, use
the Grove - Base Shield and connect the Grove - Slide Potentiometer module
to the shield using a designated Grove Interface (e.g., Analog Port 0 as shown
below):
2. Connect the board to PC using USB cable
3. Upload the following sample sketch:
int adcPin = A0; // select the input pin for the potentiometer
int ledPin = A1; // select the pin for the LED
int adcIn = 0;// variable to store the value coming from the sensor
void setup()
{
Serial.begin(9600); // init serial to 9600b/s
pinMode(ledPin, OUTPUT); // set ledPin to OUTPUT
Serial.println("Sliding Potentiometer Test Code!!");
}
void loop()
{
// read the value from the sensor:

adcIn = analogRead(adcPin);
if(adcIn >= 500) digitalWrite(ledPin,HIGH); // if adc in > 500, led light
else digitalWrite(ledPin, LOW);
Serial.println(adcIn);
delay(100);
}
4. Open the serial monitor. You should see some data from ADC.
5. Move the lever back and forth. The serial data will change correspondingly.
When the output resistance exceeds a certain preset value, the on-board
indicator LED will also light up.
As an HID Device
Slide Potentiometer can be an effective Human Interface Device (HID) and can be
used, for example, in the radio controller of a Radio Controlled toy car. The picture
below shows two Slide Potentiometers on the control panel - one to control the speed
of the left wheel, and the other to control the speed of the right wheel of the toy car
respectively. Now you can change the speeds of both motors and see the behavior.
You will see that if you make the right wheel spin faster than the left wheel, the car
will turn rightwards, and if you make the left wheel spin faster than the right wheel,
the car will turn leftwards.

With Raspberry Pi
1.You should have got a raspberry pi and a grovepi or grovepi+.
2.You should have completed configuring the development enviroment, otherwise
follow here.
3.Connection
oPlug the sensor to grovepi socket A0 by using a grove cable.
4.Navigate to the demos' directory:
cd yourpath/GrovePi/Software/Python/
oTo see the code
nano grove_slide_potentiometer.py # "Ctrl+x" to exit #
import time
import grovepi
# Connect the Grove Slide Potentiometer to analog port A0
# OUT,LED,VCC,GND
slide = 0 # pin 1 (yellow wire)
# The device has an onboard LED accessible as pin 2 on port A0
# OUT,LED,VCC,GND
led = 1 # pin 2 (white wire)
grovepi.pinMode(slide,"INPUT")
grovepi.pinMode(led,"OUTPUT")
time.sleep(1)
while True:
try:
# Read sensor value from potentiometer
sensor_value = grovepi.analogRead(slide)
# Illuminate onboard LED

if sensor_value > 500:
grovepi.digitalWrite(led,1)
else:
grovepi.digitalWrite(led,0)
print "sensor_value =", sensor_value
except IOError:
print "Error"
5.Run the demo.
sudo python grove_slide_potentiometer.py
Related Projects
The best way to learn something, is to create a project with it.
Recipe Community is a place which gathers a lot of amazing projects with step-by-
step tutorials. Makers in the community have made a lot of awesome projects with
the Grove - Slide Potentiometer, check this out!
Arduino BoomBox
Take an ordinary shoebox and convert it into an Arduino Boombox! DIY your own
MP3 player with Arduino Uno and our Grove components. The Grove - Slide
Potentiometer is used for the volume control in this project.

I want to make it.
Arduino BeatBox
I've got to say that, our maker ArduinoBasics in the Recipe community, this guys
must be born with a musical turn of mind, after the Arduino BoomBox, once again
he made this Arduino BeatBox with some basic Grove components, which really
impressed us.
I want make one!
Find out even more awesome projects on Recipe.