Configuration guide#

The web interface is available while PressureMon is in configuration mode. The ESP status LED indicates configuration mode; the exact color or blink pattern depends on the board. The device can enter configuration mode when sleep is disabled from Home, no measurement sensor is enabled, the battery voltage is outside its configured operating range, or the board’s configuration pins are connected (where supported).

Connect to the device’s configured hostname (<name>.local) or IP address. For initial setup, connect to its access point and open http://192.168.4.1. The setup access point password is password.

Home#

Home shows the latest pressure, temperature and battery readings, device status and configuration alerts. Turn on the Home page Force config mode switch to keep the web interface available while configuring. Turn it off to allow the firmware to enter measurement mode and sleep between readings.

The measured connection and processing time helps explain battery use. Slow or unreliable Wi-Fi connections can increase active time and shorten battery life. A red indicator beside a menu item means that the page has a setting or status that needs attention.

Device settings#

mDNS name sets the local hostname and device name used by integrations. Use letters, digits and hyphens, and keep it short for compatibility.
Temperature format selects Celsius or Fahrenheit for displayed and transmitted values.
Pressure format selects PSI, bar or kPa for display and supported outputs. Pressure is stored internally in PSI and converted for output.
Dark mode changes the web interface appearance.
Factory defaults clears saved configuration and restores defaults.
Restart reboots the device.

Hardware and sensors#

Voltage factor adjusts the battery measurement scaling. Compare the displayed voltage with a meter before changing this value.
Configuration voltage sets the upper battery/charging voltage threshold used to keep the device awake for configuration. The supported range is 3–6 V; set it high if charging should not trigger setup mode.
Battery saving reduces the sleep frequency to about once per hour when battery voltage falls below approximately 3.73 V.
Battery type selects LiPo or Li-ion battery voltage interpretation.

Sensors#

Open Device → Sensors. This page is separate from the hardware settings. The number of pressure sensor selectors is determined by the firmware target.

DS18B20 resolution trades temperature precision for conversion time: 9-bit is fastest (0.5 °C); 12-bit is most precise (0.0625 °C).
Temperature adjustment applies an offset from −10 to +10 degrees.
Pressure sensor selects an XIDIBEI XDB401 digital I2C range from 0.2 to 4.0 MPa. The list includes intermediate full-scale ranges; select the exact rating printed on the sensor.
Sensor 2 configures the optional second pressure sensor on boards that expose its bus.
Pressure adjustment applies an offset independently to each sensor. Calibrate pressure averages sensor readings and sets the zero offset; expose the sensor to atmospheric pressure before starting calibration.
Custom analog sensor reveals minimum and maximum voltage and pressure fields. These map the ADS1115 input voltage to the selected pressure range. The firmware ADC is configured for a ±2.048 V measurement range and reads channel A0. Its input must also remain within the ADS1115 supply rails. Check the sensor and board electrical limits before connecting it.

Wi-Fi#

Configure a primary SSID and password. An optional secondary network can be used as a fallback. Connect timeout controls how long the device waits for a network connection. Portal timeout controls how long the Wi-Fi setup portal stays open. If the device cannot connect, use its setup access point to update the credentials.

The Wi-Fi page scans for nearby networks and lets you select an SSID. Use the manual-entry view for hidden networks. The optional strongest-access-point switch is only shown when enabled by the firmware feature flags.

Push settings#

Set the device identity and shared options here before configuring individual push targets.

Token 1 is included in the default iSpindel-compatible data format used by HTTP targets.
Token 2 is available to templates and commonly used as an authorization token for GET integrations.
Sleep interval sets the time between measurement cycles, from 10 to 3600 seconds. A longer interval generally extends battery life. Weak Wi-Fi and frequent pushes can also increase power use.
Wi-Fi Direct SSID and password identify the GravityMon Gateway network. When Wi-Fi Direct is enabled, PressureMon sends its data to the gateway and bypasses the separately configured push targets.
Push timeout limits how long a target connection may take.
Estimated battery life uses recent active time and the configured interval to estimate runtime; it is an estimate, not a battery test.

HTTP POST targets#

HTTP POST 1 and HTTP POST 2 each have a destination URL, up to two request headers, a push skip interval and a data template. Use an https:// URL for TLS. Headers must use Name: value syntax, for example:

Content-Type: application/json
X-Auth-Token: your-token

A skip interval of 0 sends on every measurement cycle; a value from 1 to 5 skips that many cycles for the target. The format editor accepts the built-in formats or a custom template. Right-click the editor to see available fields. See Format templates for the template syntax.

HTTP GET#

GET sends a request to the configured URL. Configure the URL, optional headers, skip interval and output template. Use URL query parameters or a template supported by the service. HTTPS is selected by using an https:// URL.

InfluxDB#

Configure the InfluxDB v2 server URL, organization, bucket, write token, skip interval and line protocol template. The token needs write access to the selected bucket. Use the server URL expected by your InfluxDB deployment; TLS is available when the URL uses HTTPS.

MQTT#

Set the broker hostname, port, optional username and password, skip interval, topic and data template. Enter a hostname without a URL scheme. Common broker ports are 1883 for unencrypted MQTT and 8883 for MQTT over TLS. The UI accepts ports from 0 to 65535; use the port configured by your broker. Credentials are optional when the broker permits anonymous access.

Bluetooth#

Choose Disabled or PressureMon iBeacon. BLE is available on ESP32-S3 and ESP32-C3 targets; it is not available on ESP32-S2 Mini. The UI’s Eddystone option is currently disabled in code. The firmware advertises PressureMon sensor readings for nearby BLE receivers; use the documented PressureMon beacon format in a compatible scanner.

Wi-Fi setup mode#

When no saved network credentials are available, the device starts an access point named PressureMon with the default password password. Connect and browse to http://192.168.4.1. The network settings page can scan for visible access points or open its manual-entry view for a hidden SSID. Saving new Wi-Fi settings requires a restart to connect using them.

Other pages#

The Other menu includes serial output, settings backup and restore, firmware update, support logs, tools and About information.

Backup downloads a text file containing device configuration and format templates. Restore accepts a previously exported .txt file. Keep a backup before changing many settings or reinstalling firmware.
Firmware update uploads a firmware file to the running device. Choose a binary built for its detected board and keep the device powered until it restarts.
Support displays device logs and includes support actions such as push status and hardware diagnostics.
Tools lists LittleFS files and storage use. Expand advanced tools to upload or delete files and to manage CORS settings. These are internal firmware files; deleting or replacing them can affect device operation.
SD card files are a conditional file-manager view in the shared UI. The current PressureMon firmware does not initialize or expose an SD card interface, so an SD slot is not part of the documented reference hardware.

The Device → Sensors calibration action requires a detected pressure sensor. The Tools page also provides voltage-factor calibration and hardware scans: I2C addresses are scanned on the second sensor bus and 1-Wire devices are listed when present.