https://github.com/thilinasatoru/item_counter
IOT Project For Shopping Cart Item Counter.
https://github.com/thilinasatoru/item_counter
hx711 iot loadcell nodemcu-esp8266 oled-display
Last synced: over 1 year ago
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IOT Project For Shopping Cart Item Counter.
- Host: GitHub
- URL: https://github.com/thilinasatoru/item_counter
- Owner: ThilinaSatoru
- Created: 2024-08-12T03:46:30.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2024-09-08T15:32:06.000Z (over 1 year ago)
- Last Synced: 2025-01-08T22:53:45.086Z (over 1 year ago)
- Topics: hx711, iot, loadcell, nodemcu-esp8266, oled-display
- Language: C++
- Homepage:
- Size: 261 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# Device Function
1. As soon as the device starts it checks for configured `wifi` credentials and connects to wifi network.
2. Then it starts reading the `weight scale` and waits for any weight adding to the scale.
3. Once a weight add to the scale, it immediately increments the counter and displays in the screen. *Both add and remove will increment and decrement the counter acurately*.
4. Mean while, if user press the `button` it will send the `current item count` and send it to the server. The `respose` from the server will be the `cashier No.` and will be displayed to the user.
5. When the `cashier No.` displays the `Blue LED` will also turn `ON`.
6. If user **switch the button again**, it will again show the current item count and the `Blue LED` turn `OFF`.
# Device Schemetic
## Power Supply
1. There are 2 `18650 Lithium 3.7v` Batteries.
2. `DC-DC Regulator` and `7805 5v Regulator` converts the Voltage to stable `5v`.
3. The red 5v wire from regulator connects to `NodeMCU` Pin `VV` and Black wire connects to any `GND` pin. This powers the `NodeMCU` Module. The `Red LED` just indicates the power supply.
4. `NodeMCU` outputs `3.3v` for other pins.
## OLED Display
[More Info - 0.96 inch OLED Display with Arduino IDE](https://randomnerdtutorials.com/esp8266-0-96-inch-oled-display-with-arduino-ide/)
1. `OLED SDA` pin connects to `NodeMCU D2` pin.
2. `OLED SCL` pin connects to `NodeMCU D1` pin.
3. Red `3.3v` and Black `GND`.
> We’re using I2C communication protocol. The most suitable pins for I2C communication in the `NodeMCU` are `GPIO 5 (SCL)` and `GPIO 4 (SDA)`.
## Weight Sensor Digital Scale
[More Info - NodeMCU with Load Cell and HX711 Amplifier (Digital Scale)](https://randomnerdtutorials.com/esp8266-load-cell-hx711/)
1. `HX711 DT` pin connects to `NodeMCU D6` pin.
2. `HX711 SCK` pin connects to `NodeMCU D7` pin.
3. Red `3.3v` and Black `GND`.
## Switch and Blue LED
1. `Switch` connects to `NodeMCU D5` and `GND` pins.
2. `Blue LED` connects to `NodeMCU D8` and `GND` pins.