Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/andresberejnoi/arduino-electronic-dog-scale

Micro-controller project for a scale with 16x2 LCD display, Arduino Uno and ATtiny85
https://github.com/andresberejnoi/arduino-electronic-dog-scale

arduino arduino-uno attiny attiny85 c cpp diy-solutions dogs electronics electronics-projects i2c-backpack i2c-display lcd1602 lcd16x2 micro-controller scale

Last synced: 30 days ago
JSON representation

Micro-controller project for a scale with 16x2 LCD display, Arduino Uno and ATtiny85

Awesome Lists containing this project

README 

        
# Dog Scale

This is a scale meant for weighting our dogs and maybe suitcases by using 4 3-wire load cells connected to an amplifier HX711 and displaying the code to a 16x2 LCD screen with an included I2C backpack to control it. I also made a Youtube video about this project, in case you want to see the final result, including a nice wooden platform. You can watch the video [here](https://youtu.be/P-fGgXq-RAM).



The micro-controller was initially an Arduino Uno / Diavolino model but since there were many pins not being used, and I did not want to use my entire Arduino for this, I decided to miniaturize this project by using an ATtiny85 chip. It has just the right amount of pins for this and the size is very conservative.



## ArduinoUno_Scale_Final

This sketch contains the code I used for the Arduino Uno.There is a chance it is behind the ATtiny85 version since I switched over to that chip to complete things. However, the code is super short, so differences will be minuscule. 



## ATtiny85_Scale_Final

This sketch is to be used with the ATtiny85 version of the scale.



## Two Versions

I will try to maintain both versions (Arduino and ATtiny85) working and synched to each other but the final objective is that the ATtiny85 will be the chip of choice.

I used one of the examples of the HX711 library as started code and modified it to suit my needs. There are some functions that I also used from online forums and the like. If I find the links again, I will add them to the coode.



## Components

I will do my best keep this updated with all components used for the main part of the project but also for extra related activities.



Edit: I'll go ahead and add some Amazon affiliate links so you can find the components more easily. If you end up buying something, I will get a comission but it will not come at an extra cost to you. It is a way to support more projects like this. Thanks.



Main Project Stuff:

- [HX711 amplifier](https://amzn.to/2TlRH4c) for load cell sensors

- [4 50kg 3-wire load cells](https://amzn.to/2Zskk3q) (one on each corner of a square) connected together

- One old PC beeper or [piezo speaker](https://amzn.to/2AFxFeh) (for simple sounds when turning on)

- [Arduino Uno](https://amzn.to/2ZjUChB) / Diavolino / [ATtiny85](https://amzn.to/2LJxjpj)

- [16x2 LCD screen with an included I2C backpack](https://amzn.to/3dUkh4u) (with 0x27 address but that's just my particular component)

- Power source (a portable usb battery in my case)

- USB cable for power

  - In my case, my Diavolino needs an FTDI breakout board to connect through a usb cable.



Other obvious things to have are:

- [Jumper wires](https://amzn.to/2ZwV1gT)

- [Soldering kit](https://amzn.to/2z6pLdM)

- A base where to set the sensors

- Housing for the components



Other Components:

- [10 uF capacitor](https://amzn.to/2LL1BYK) (for when using Arduino Uno as ISP to program ATtiny85 or burn its bootloader)