Projects

Standalone Scale Kit

Use a Raspberry Pi and Graphic LCD Phidget to make your Scale Kit fully standalone!

Start
Parts Setup Transfer Code Write Code Start Automatically Practice Troubleshoot

Parts

Before getting started, make sure you have the following parts.

Any Raspberry Pi

Kits/ Kit4015

Phidget Scale Kit

Sensors / LCD1100

Graphic LCD Phidget

Setup

Step 1

Simply connect your Scale Kit to your Raspberry Pi and your GraphicLCD Phidget to your VINT Hub.

If you haven't set up your Raspberry Pi with Phidgets yet, visit the Getting Started Kit tutorial.

Transfer Code

Transfer the code from your Scale Kit Project to your Raspberry Pi.

Next, modify your program so the Graphic LCD Phidget is used to display the current weight readings.

Write Code (Python)

Below is an example program for Python that displays the current weight value in grams, as well as a bitmap of a scale.

If you are not familiar with the Graphic LCD, view the Device Tutorial for more information.

  
#Add Phidgets Library
from Phidget22.Phidget import *
from Phidget22.Devices.VoltageRatioInput import *
from Phidget22.Devices.LCD import *
#Required for sleep statement
import time

#define bitmap
weight = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
]

#Create
scale = VoltageRatioInput()
lcd = LCD()

#open
scale.openWaitForAttachment(1000)
lcd.openWaitForAttachment(1000)

#Use offset value previously measured
offsetValue = INSERT OFFSET HERE

#Use your Phidgets
#Configure LCD
lcd.setBacklight(0.25)
lcd.writeBitmap(64, 0, 64, 64, weight)

while(True):
    #calculate weight in kg
    weight = 4700 * (scale.getVoltageRatio() - offsetValue)

    #Display weight, only show 3 decimal places
    weightString = "%.3f kg " % weight
    print(weightString)
    lcd.writeText(LCDFont.FONT_6x10, 0, 22, "Weight: ")
    lcd.writeText(LCDFont.FONT_6x10, 0, 32, weightString)
    lcd.flush()
    time.sleep(0.2)

Start Program Automatically

Now that your scale is logging weight and displaying it on the LCD, you can use cron and schedule your program to run automatically when the Raspberry Pi boots.

For more information on cron and running on boot, visit the Start Automatically project.

After saving your crontab file, you can unplug your Raspberry Pi from any monitors/keyboards, and it will keep your scale running with no input!

Practice

  1. Try adding functionality to your scale using the Getting Started Kit. For example, use the Red Button to zero your scale.
Troubleshoot
  1. Make sure everything is plugged in properly to your computer
  2. Stop running other programs that are using your Phidgets before running a program.

If these do not solve your issue visit the Advanced Troubleshooting Page.

Back to Projects

What are Phidgets?

Phidgets are programmable USB sensors. Simply plug in your sensor, write code in your favorite language and go!

Phidgets have been used by STEM professionals for over 20 years and are now available to students.

Learn more
Level 1

Getting Started

Tutorial and projects for your Getting Started Kit
Level 2

Device Tutorials

Learn more about some of the Phidget sensors
Level 3

Projects

Apply your skills and create cool projects

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