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.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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Amazing DIY kit with some real purpose, especially if combined with esp8266 for example for reporting weight readings to cloud
I think “10 kilograms with a reported one gram accuracy” is more likely to be “one gram resolution”.
Now if they made it programmable, you could have postal scales the tell you the price by weight and size?
What? Using any one of many modern flash micros the design could eliminate, clock chip, eeprom and temp sensor
@theguyuk
It’s programmable since you can take out the processor, and in theory you could program its flash with your own firmware. That would be a lot of work though. I’ve asked ICStation if they have the source code for the MCU.
But ideally, you’d probably want something with WiFi to achieve what you want to retrieve pricing data from the post office website for a given weight & country.
@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 »