214 lines
9.2 KiB
Markdown
214 lines
9.2 KiB
Markdown
# powerMC - Energy and Current Measurement System
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An ESP32 based energy and current measurement system.
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Most of the code is generated by ChatGPT.
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## Webserver
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The web server is implemented on the ESP32 and provides various endpoints for operation and display of information. Here are the defined URLs and their functions:
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### URL Paths:
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1. **`/` (Root)**
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- **Output:** HTML page with dynamic content.
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- **Return:** Webpage with various data and options.
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- **Format:** HTML.
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- **Purpose:** Displays real-time data and provides options for configuration and control.
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2. **`/json`**
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- **Output:** JSON data.
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- **Return:** JSON object with sensor values and configuration parameters.
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- **Format:** JSON.
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- **Purpose:** Provides sensor values and configuration settings in a machine-readable format.
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This is an example of a JSON object containing various measurement values and configuration parameters. Here is an explanation of the fields included:
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```json
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{
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"busVoltage": 12.35,
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"shuntVoltage": 0.015,
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"current": 0.5,
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"power": 6.175,
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"energy": 100.25,
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"temperature": 25.5,
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"humidity": 45,
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"errorCode": 0,
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"shuntValue": 0.0001,
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"ina226Status": 3,
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"ina226ShuntValue": 0.0002,
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"ina226AlertFlag": 0,
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"ina226AlertLimit": 0,
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"ina226CurrentLSB": 0.0005
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}
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```
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- `busVoltage`: The voltage at the bus in volts.
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- `shuntVoltage`: The voltage across the shunt resistor in volts.
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- `current`: The current consumption in amperes.
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- `power`: The power in watts.
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- `energy`: The energy in watt-hours of the attached battery.
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- `temperature`: The temperature in degrees Celsius.
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- `humidity`: The humidity in percentage.
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- `errorCode`: An error code indicating possible error conditions.
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- `shuntValue`: The value of the shunt resistor in ohms which is used for configuration.
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- `ina226Status`: The status of the INA226 initialization (setMaxCurrentShunt function call).
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- `ina226ShuntValue`: The value of the shunt resistor according to the INA226 chip in ohms.
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- `ina226AlertFlag`: A flag indicating whether a warning has been triggered by the INA226 chip.
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- `ina226AlertLimit`: The limit value for alerts from the INA226 chip.
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- `ina226CurrentLSB`: The value of the least significant bit (LSB) for the current according to the INA226 chip in amperes represents the smallest measurable current level that the INA226 chip can detect.
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#### Error codes in `errorCode`
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The variable `globalError` is used as a bitmask, where each bit represents a specific error condition. Here are the possible error codes and their meanings:
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| Descriptive Name | Value | Meaning |
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|:----------------------------|---------:|:---------------------------------------------------------|
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| `ERROR_NONE` | 0b00000000 | No error. The device is functioning properly, there are no errors present. |
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| `ERROR_MAX_CURRENT_EXCEEDED`| 0b00000001 | The maximum current consumption has been exceeded. There might be an overload condition on the device. |
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| `ERROR_CURRENT_BELOW_MIN` | 0b00000010 | The current consumption is below the permissible minimum. There may be an issue with the power supply. |
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| `ERROR_MAX_TEMP_EXCEEDED` | 0b00000100 | The maximum temperature has been exceeded. The device could overheat. |
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| `ERROR_TEMP_BELOW_MIN` | 0b00001000 | The temperature is below the permissible minimum. There is a risk of hypothermia or other temperature-related issues. |
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| `ERROR_MAX_HUMI_EXCEEDED` | 0b00010000 | The maximum humidity has been exceeded. This could lead to moisture-related problems. |
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| `ERROR_HUMI_BELOW_MIN` | 0b00100000 | The humidity is below the permissible minimum. There is a risk of low humidity. |
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|`ERROR_INA226_UNCONFIGURED` | 0b10000000 | The configuration settings for the shunt voltage and maximum current exceed the limits of the INA226 library. |
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Please note that multiple errors can occur simultaneously as the bitmasks can be combined. For example, `ERROR_MAX_TEMP_EXCEEDED | ERROR_MAX_HUMI_EXCEEDED` could indicate that both the maximum temperature and humidity have been exceeded.
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#### Error codes ina226Status
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| descriptive name error | value | meaning |
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|:------------------------------|---------:|:----------|
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| INA226_ERR_NONE | 0x0000 | OK
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| INA226_ERR_SHUNTVOLTAGE_HIGH | 0x8000 | maxCurrent \* shunt > 80 mV
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| INA226_ERR_MAXCURRENT_LOW | 0x8001 | maxCurrent < 0.001
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| INA226_ERR_SHUNT_LOW | 0x8002 | shunt < 0.001
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| INA226_ERR_NORMALIZE_FAILED | 0x8003 | not possible to normalize.
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#### Error codes ina226AlertLimit
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| description alert register | value | a.k.a. |
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|:---------------------------|-------:| -------:|
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| INA226_SHUNT_OVER_VOLTAGE | 0x8000 | SOL |
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| INA226_SHUNT_UNDER_VOLTAGE | 0x4000 | SUL |
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| INA226_BUS_OVER_VOLTAGE | 0x2000 | BOL |
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| INA226_BUS_UNDER_VOLTAGE | 0x1000 | BUL |
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| INA226_POWER_OVER_LIMIT | 0x0800 | POL |
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| INA226_CONVERSION_READY | 0x0400 | |
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3. **`/config`**
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- **Output:** HTML page for configuration.
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- **Return:** Webpage with form fields for configuring parameters.
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- **Format:** HTML.
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- **Purpose:** Allows users to customize device settings through a web interface.
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4. **`/saveConfig`**
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- **Output:** JSON response.
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- **Return:** Confirmation message.
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- **Format:** JSON.
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- **Purpose:** Saves configuration changes submitted via the configuration form.
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5. **`/demoMode1`**
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- **Output:** Redirect to root.
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- **Return:** Redirect to root after activating Demo Mode 1.
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- **Format:** HTML.
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- **Purpose:** Initiates Demo Mode 1, simulating a specific charging scenario.
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6. **`/demoMode2`**
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- **Output:** Redirect to root.
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- **Return:** Redirect to root after activating Demo Mode 2.
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- **Format:** HTML.
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- **Purpose:** Initiates Demo Mode 2, simulating a specific charging scenario.
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7. **`/demoMode3`**
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- **Output:** Redirect to root.
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- **Return:** Redirect to root after activating Demo Mode 3.
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- **Format:** HTML.
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- **Purpose:** Initiates Demo Mode 3, simulating a specific discharging scenario.
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8. **`/resetESP`**
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- **Output:** HTML page with restart message.
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- **Return:** HTML page displaying the restart process.
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- **Format:** HTML.
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- **Purpose:** Initiates a restart of the ESP32 device.
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9. **`/resetWifi`**
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- **Output:** HTML page with reset message.
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- **Return:** HTML page displaying the process to reset the Wi-Fi configuration.
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- **Format:** HTML.
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- **Purpose:** Resets the Wi-Fi configuration and restarts the device.
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10. **`/updateFirmware`**
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- **Output:** HTML page with firmware update options.
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- **Return:** HTML page displaying firmware update options.
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- **Format:** HTML.
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- **Purpose:** Provides options for updating the device firmware.
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11. **`/updateFirmwareAction`**
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- **Output:** HTML page with update status.
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- **Return:** HTML page displaying the firmware update process.
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- **Format:** HTML.
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- **Purpose:** Initiates the firmware update process and displays the current update status in real-time.
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12. **`/readUpdateFirmwareStatus`**
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- **Output:** HTML page with update status.
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- **Return:** HTML page displaying the current firmware update status.
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- **Format:** HTML.
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- **Purpose:** Provides the current update status during the firmware update process in real-time.
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13. **`/css`**
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- **Output:** Custom CSS styles.
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- **Return:** CSS styles for the HTML pages.
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- **Format:** CSS.
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- **Purpose:** Provides style templates for the HTML pages.
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These URL paths form a basic API for interacting with the ESP32 device, allowing users to display real-time data, configure settings, initiate demo modes, and update the firmware.
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## Functions
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### configureIna226()
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The `configureIna226()` function configures the INA226 sensor with specific settings.
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#### Steps:
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1. **Set Minimal Shunt:**
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- Description: Overwrites the INA226_ERR_SHUNT_LOW parameter with a minimal shunt value.
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The ina226 library default values is 0.001.
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- Code: `ina226.setMinimalShunt(0.0001);`
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2. **Set Maximum Current Shunt:**
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- Description: Sets the maximum current shunt value with normalization (3rd parameter set to true) to 3 floating-point accuracy.
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- Code:
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```cpp
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ina226Status = ina226.setMaxCurrentShunt(current ampere, shunt ohm, true);
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```
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3. **Set Averaging:**
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- Description: Sets the averaging mode to use 16 samples for building an average value.
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- Code: `ina226.setAverage(2);`
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## Used libraries (Arduino)
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- WiFi at version 2.0.0
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- ESP32httpUpdate at version 2.1.145
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- HTTPClient at version 2.0.0
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- WiFiClientSecure at version 2.0.0
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- Update at version 2.0.0
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- FS at version 2.0.0
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- SPIFFS at version 2.0.0
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- WebServer at version 2.0.0
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- ArduinoJson at version 7.0.2
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- WiFiManager at version 2.0.16-rc.2
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- DNSServer at version 2.0.0
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- EEPROM at version 2.0.0
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- Wire at version 2.0.0
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- INA226 at version 0.5.2 (zip file in repository modified by me)
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- Adafruit GFX Library at version 1.11.9
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- Adafruit BusIO at version 1.15.0
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- SPI at version 2.0.0
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- Adafruit SSD1306 at version 2.5.9
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- Adafruit Unified Sensor at version 1.1.14
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- Adafruit BME280 Library at version 2.2.4
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Use the modified INA226 zip file from the repository to support shunt resistors down to 0.0001 Ohm.
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