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Current Product Don't Have Test Firmware

Note: pls, use PC chrome/edge browser, if can't connect, refresh the webpage.

1. Click connect button

2. After connected successfully, pick a firmware

3. Click the burn button

4. After burning successfully, Unplug the device and restart.

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Scales Kit

SKU:K121

Description

Scales Kit is a high precision low-cost weighing kit. This digital Scales kit is consist of four pieces of half-bridge resistive strain gauges, with a total weighing range of 200kgs. It is equipped with a 24-bit A/D converter chip HX711, specially designed for the high precision electronic scale. The built-in low-noise programmable amplifier supports 32/64/128 times gain adjustment. With the help of M5Stack core for programming, you can create IoT based Weighing Scale in just a few minutes!

NOTE: The Scale Kit will need a cover plate to work with, and the size of the cover plate should not exceed 50cm on one side.

Product Features

  • Total weighing range of 200kgs
  • HX711:
    • High precision 24bit ADC
    • Programmable gain amplification 32, 64 and 128
    • 10SPS output data rate
  • Half-bridge resistive strain gauge.
    • Output sensitivity: 1.0±0.1mV/V
    • Non-linearity: 0.3% F.S
    • Integrated Accuracy: 0.3%F.S
    • Zero output: ±0.3mv/V
    • Difference between upper and lower impedance of each strain gauge: 0.8Ω
    • Output (in) impedance: 1000±5Ω
  • Development platform:

Included

  • 4x Half-bridge resistive strain gauge
  • 1x WEIGHT UNIT
  • 1x HY2.0-4P Cable (20cm)
  • 4x Double-sided adhesive paper (39 * 20 * 0.8mm)
  • 4x Double-sided adhesive paper (39 * 12 * 0.8mm)

Application

  • Electronic weighing

Installation Diagram

Specifications

Specifications Parameters
HX711 Output Sensitivity: High Precision 24bit ADC
Programmable Gain Amplification 32, 64, 128
10SPS Output Data Rate
Half-Bridge Resistance Strain Gauge Output Sensitivity: 1.0±0.1mV/V
Nonlinearity: 0.3%FS
Comprehensive Accuracy: 0.3%FS
Zero Output: ±0.3mv/V
Each The difference between the upper and lower impedance of the gauge strain gauge: 0.8Ω
Output (input) impedance: 1000±5Ω
Gross Weight 92.5g
Net Weight 126.3g
Packing Size 105mm x 65mm x 40mm

PinMap

  • WEIGHT UNIT
M5CORE - PORT B G36 G26 5V GND
WEIGHT UNIT DATA Pin (DAT) CLOCK Pin (CLK) VCC GND

Schematic

  • WEIGHT UNIT

offsets/calibration

Set the ADC chip GAIN=128, 10SPS output rate, under the condition of 5kg weight measurement, the error is about ±1%. Calibration is required before starting weighing, please refer to the code below for operation.


#include "HX711.h"

HX711 scale;

void setup() {
     // 1. Set the ADC value in the case of 0g and set it to offset
     scale.tare();
}

void loop() {
     // 2. Read the average value of ADC in the case of standard weight (such as 5kg)
     long kg_adc = scale.read_average(20);
     // 3. Read the offset in the current 0g case
     kg_adc = kg_adc - scale.get_offset();
     // 4. Calculate and configure the scale parameter
     scale.set_scale( kg_adc / (5 * 1000.0));
}

Example

Arduino

FAQ

Q1: How do I remove the speaker floor noise when the M5Core is on or running?

Execute the following statement in Setup() of the Arduino program

Q2: How does M5Core2 stack modules?

When M5Core2 is stacked with other M5 modules, you need to remove the battery base of Core2, which does not support module stacking.

Q3: A timeout error is displayed when uploading the program to the device

Reason and solution: The power supply current of the port is insufficient, which can cause the device to not enter the download mode normally. You can try to connect a capacitor (>0.1uF) between the RST pin and the GND pin, or when uploading the program, set the G0 Short-circuit to GND, so that G0 can be set to a low level state normally

Q4: How to solve the phenomenon of automatic signal triggering of M5Core button A

Add the header file #include <driver/adc.h> and the function adc_power_acquire(); in the Arduino program

Q5: M5 device battery life

The battery life of the controller is affected by various factors such as battery capacity, operating status, and load, so there is no fixed value. Reducing the load and adopting a sleep strategy can effectively increase the battery life.

Q6: Can multiple modules with batteries be stacked at the same time?

Support multiple stacks, the total capacity of the batteries in parallel increases, and the voltage remains unchanged. However, since the discharge of each battery is not balanced during use, there is a voltage difference between the batteries, which may cause the battery to charge backwards. .(will lose part of the battery capacity)

Q7: M5 master supports WiFi connection to 5G frequency band

ESP32 module currently does not support WiFi in 5G band, only 2.4G.

Q8: The RS485 device cannot communicate normally/data is garbled. Packet loss, etc.

Confirm whether the TX/RX pin on the TTL side of the pin is correct, try to add two 120Ω terminal resistors at the beginning and end of the device line to reduce signal reflection interference

Q9: The difference between different masters and camera products

Click the link below to view the product comparison table

Q10: M5 camera image blur, how to adjust the focal length

Rotate the lens to adjust the focal length within a certain range

Q1: How to read the programmed firmware?

Use esptool to read the flash content of esp32 and export the bin file. Refer to the detailed operation

Q2: Several solutions for esp32 board download failure in Arduino IDE board management

Restart the Arduino IDE, the computer uses the mobile AP mobile network to download.

Method 3: Download the resource package provided by M5Stack for direct installation, and extract the contents to the board management path of Arduino, such as (C:\Users\Sean\AppData\Local\Arduino15\packages), https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/packages/m5stack_v2.0.0.zip
Q3: Arduino SPIFFS file upload operation

Refer to the Github link below, use arduino-esp32fs-plugin for file upload

Q4: When M5Burner burns firmware, an error pop-up window or exception occurs

Check if the COM of the corresponding device is selected and if the M5Burner is the latest version

Q5: Does the M5 master device support multi-language display (Chinese, English, Japanese, Russian, etc.)?

UIFlow users can switch the Label font to Unicode, Arduino users can use the Chinese font library provided in the M5GFX driver library

Q6: The program cannot load the SD card normally

Confirm whether the SD card format is FAT32, and no partitions exist.

Q7: How to use Bluetooth, HTTP, SD, WebServer, FreeRTOS and other features in Arduino IDE

You can refer to the following link for other ESP32 users to share the case program

Q8: How to download programs for STAMP C3U

STAMP C3U enters program download mode operation: 1. Long press the center button (G9) of STAMP C3U when the power is off. 2. Connect to the computer, after the port is successfully identified, program burning.

Q9: How STAMP C3U defines UART0 output mode

By default, USB CDC is not enabled, the serial port output started by C3U will be output through the default pins (G20, G21) of UART0. If you want to output through USB, please use the IDE to output Its USB CDC option is enabled. (Arduino users can enable it through Tools->USB CDC on Boot-Enabled. For IDF users, please refer to the ESP IDF official documentation.)

Q10: Unable to connect to UIFlow Desktop IDE

Refer to the UIFlow documentation of the corresponding device to check whether the device has entered the USB programming mode.

COMMON

Q1: Consultation for after-sales problems of products

Describe the problems encountered in detail. Screenshots of the programs involved or files can be added as attachments and sent to M5Stack's official after-sales email

Q2: Code Resources, Cases, User Communication