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The Dairy Farm (Smart Milk Volume, Fat Percentage & Business POS)

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Run a smart dairy farm collection center! Measure milk volume in graduated cylinders, weigh milk cans on a load cell scale, and test milk fat percentage with an optical turbidity sensor to compute daily earnings.

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Props & Materials Required

  • •Milk collection container mounted on scale platform
  • •5kg HX711 load cell weight scale sensor
  • •Optical turbidity / light transmission sensor (milk fat tester)
  • •Keypad POS terminal module
  • •ESP32 controller board
  • •16x2 LCD display screen
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Weigh Milk Can

Place 5-Liter milk can on the load cell platform. Scale reads '5.15 kg (5,150 grams)'.

2

Test Milk Fat Percentage

Insert optical fat sensor probe into milk sample. Sensor measures light scatter.

3

Read Fat Content & Rate

LCD displays 'Fat Rating: 6.5% (FULL CREAM MILK) | Price per Liter: ₹60'.

4

Calculate Total Farmer Earnings

POS computes 5 Liters × ₹60 = ₹300! Speaker announces bill receipt: 'Total Payout: ₹300!'

Why It Works & Notes

The Dairy Farm chapter links liquid volume/mass measurement with micro-business calculations (Liters of milk × Fat rating = Price). Combining digital scales with optical fat sensors makes practical math real.