Build your own Digital Scale with this DIY Kit

Electronics DIY kits are easy to find from either Arduino kits, or robotics kits, to oscilloscope kits among others. But I can’t remember ever seeing digital scale kits, maybe because I did not look for it, but that’s exactly what I found on ICstation for $27.99 with a scale that can measure weights up to 10 kilograms with a reported one gram accuracy. The DIY scale can also be pruchased on eBay for $29.99.

Main items in the (Trans–CRS–162DZC) kit and features:

  • MCU – STC MCU Limited STC89C52 8-bit (80C51 compatible) MCU in 40-pin DIP package
  • RTC – DS1302 8-pin DIP chip + CR1220 socket and battery
  • EEPROM – AT24C02 serial EEPROM (DIP chip)
  • Display – LCD1602 16×2 digit display
  • Keypad – 4×4 matrix keypad
  • Sensors – DS18B20 one-wire temperature sensor, “C3 high precision” 10kg strain pressure sensor
  • Boards – HX711 load cell amplifier module, printed circuit board for the MCU, RTC, EEPROM, etc…
  • Misc – Buzzer, transistors, various passive components
  • Enclosure and accessories
  • Power Supply – 5V DC
  • Dimensions – 15.2cm x  14.1cm x 6.5cm (assembled)
  • Weight – 500 grams

Follow the assembly guide to build the scale yourself, and you should be good to good to use your own scale/clock/alarm/thermometer toy.The scale could also be the starting point to make your own design either programming the STC89C52 micro-controller with your own program (AFAIK source code is not available so you’d have to start from scratch), or possibly “IoTize” the scale by replacing the MCU by a Bluetooth or WiFi (ESP8266) module.

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6 Comments
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guzman
guzman
3 years ago

Amazing DIY kit with some real purpose, especially if combined with esp8266 for example for reporting weight readings to cloud

gicho
gicho
3 years ago

I think “10 kilograms with a reported one gram accuracy” is more likely to be “one gram resolution”.

theguyuk
theguyuk
3 years ago

Now if they made it programmable, you could have postal scales the tell you the price by weight and size?

Occam
Occam
3 years ago

What? Using any one of many modern flash micros the design could eliminate, clock chip, eeprom and temp sensor

Drone
Drone
3 years ago

@gicho You said, ‘I think “10 kilograms with a reported one gram accuracy” is more likely to be “one gram resolution”.’ It may not achieve “10 kilograms with a reported one gram accuracy”, but if it is designed with reasonable care it should get fairly close. For example, a single load-point cantilever shear-beam load cell (like the one used in the scale shown here) should be capable of an OIML Type-C3 total error of +/-0.02% of rated load. At 10 Kg that comes to +/-2g. Significantly better results are possible with calibration and/or temperature compensation. Remember, that’s just the load… Read more »

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