meshtastic/docs/software/modules/environment.md

id	title	sidebar_label
environment-module	Environment measurement	Environment measurement

About

The Environment Measurement Module will allow nodes to send a specific message with information from connected environmental sensors. Currently supported sensors are BME280, BME680, DHT11, DHT12, DHT21, DHT22, Dallas 1-wire DS18B20, and MCP9808.

The preferred setup is using I2C, so the telemetry_module_sensor_pin may not be needed.

Configuration

These are the settings that can be configured.

telemetry_module_enabled
    Is the module enabled?

    0 = Disabled (Default)
    1 = Enabled

telemetry_module_screen_enabled
    Show received sensor readings on device screen.

    0 = Disabled (Default)
    1 = Enabled

telemetry_module_read_error_count_threshold
    Error count threshold for failed sensor readings.

    Default = 0

preferences.telemetry_module_update_interval
    How often (in seconds) should sensor readings be broadcasted?

    Default = 0

telemetry_module_recovery_interval
    For how long should we wait (in seconds) before trying to read sensors again upon exceeded error threshold?

    Default = 0

telemetry_module_display_fahrenheit
    Should temperature readings be converted to fahrenheit?

    0 = Disabled (Default)
    1 = Enabled

telemetry_module_sensor_type
    What sensor is connected?

    0 = DHT11 (Default)
    1 = Dallas 1-wire DS18B20
    2 = DHT12
    3 = DHT21
    4 = DHT22
    5 = BME280
    6 = BME680
    7 = MCP9808

telemetry_module_sensor_pin
    Which pin is the sensor connected to?

    Default = 0

Usage Notes

For basic usage, start with:

telemetry_module_enabled = 1

telemetry_module_screen_enabled = 1

Depending on which pin your sensor is connected to, set it accordingly:

telemetry_module_sensor_pin = 13

:::note The device must be restarted after the settings have been changed for the module to take effect. :::

Hardware

The sensors can be wired differently, here's one example for sensor DS18B20 https://randomnerdtutorials.com/esp32-ds18b20-temperature-arduino-ide

Example of T-LoraV1 with DHT22 temperature sensor

Setup of a T-LoraV1 with DHT22 temperature sensor.

<img src="T-LoraV1 with DHT22" src="/img/hardware/lora_v1_with_DHT22.jpg" style={{zoom:'25%'}} />

Requirements:

• T-LoraV1 (but any esp32 should work, just be sure to double check which GPIO to use)
• DHT22 sensor
• 10 Kohm resistor (optional, but recommended)
• breadboard (optional)
• two red wires (could be a different color, but 5V is typically red)
• two yellow wires for GPIO (could be a different color)
• one black wire (could be a different color, but GROUND is typically black)

Steps:

• disconnect power/battery
• connect black wire from GROUND to "-" on the DHT22
• connect yellow wire from middle PIN to a row on bread board
• connect red wire from 5V to a row on breadboard
• connect resistor between red and yellow rows
• connect red wire from row with red to "+" on DHT22
• connect yellow wire from yellow row to GPIO on device (ex: GPIO21)
• double check the cabling (if you get it wrong, you can damage the device and/or the DHT22 sensor)
• plug in device
• configure the device:

meshtastic --set telemetry_module_measurement_enabled true --set telemetry_module_screen_enabled true --set telemetry_module_update_interval 15 --set telemetry_module_display_farenheit true --set telemetry_module_sensor_type DHT22 --set telemetry_module_sensor_pin 21

:::tip You can change the values above to suit your needs. The commands can be run one at a time or in a group as show above. :::

• reboot/reset the device (press the RST button or unplug/plug in the device)
• when the device boots it should say "Environment" and it may show the sensor data
• if "no data", then triple check the wiring
• if still "no data", run:

meshtastic --info

and verify the the telemetry_module_sensor_type and telemetry_module_sensor_pin

Example of T-LoraV1 with Dallas DS18B20 temperature sensor

Setup of a T-LoraV1 with DS18B20 temperature sensor.

<img src="T-LoraV1 with DS18B20" src="/img/hardware/lora_v1_with_DS18B20.jpg" style={{zoom:'25%'}} />

Requirements:

• T-LoraV1 (but any esp32 should work, just be sure to double check which GPIO to use)
• DS18B20 sensor
• 10 Kohm resistor (optional, but recommended)
• breadboard (optional)
• two red wires (could be a different color, but 5V is typically red)
• two yellow wires for GPIO (could be a different color)
• one black wire (could be a different color, but GROUND is typically black)

Steps:

• disconnect power/battery
• connect black wire from GROUND to "-" on the DS18B20
• connect yellow wire from DAT pin to a row on bread board
• connect red wire from 5V to a row on breadboard
• connect resistor between red and yellow rows
• connect red wire from row with red to "VCC" on DS18B20
• connect yellow wire from yellow row to GPIO on device (ex: GPIO21)
• double check the cabling (if you get it wrong, you can damage the device and/or the sensor)
• plug in device
• configure the device:

meshtastic --set telemetry_module_measurement_enabled true --set telemetry_module_screen_enabled true --set telemetry_module_update_interval 15 --set telemetry_module_display_farenheit true --set telemetry_module_sensor_type DS18B20 --set telemetry_module_sensor_pin 21

:::tip You can change the values above to suit your needs. The commands can be run one at a time or in a group as show above. :::

• reboot/reset the device (press the RST button or unplug/plug in the device)
• when the device boots it should say "Environment" and it may show the sensor data
• if "no data", then triple check the wiring
• if still "no data", run:

meshtastic --info

and verify the the telemetry_module_sensor_type and telemetry_module_sensor_pin

Example of RAK 4631 with Environment Sensor

Setup of a RAK 4631 with Environment Sensor

<img src="RAK4631_with_EnvSensor" src="/img/hardware/rak/RAK4631_with_EnvSensor.jpg" style={{zoom:'25%'}} />

Requirements:

• RAK4631
• Environment Sensor

Steps:

• configure the device:

meshtastic --set telemetry_module_measurement_enabled true --set telemetry_module_screen_enabled true --set telemetry_module_update_interval 15 --set telemetry_module_display_farenheit true --set telemetry_module_sensor_type 6

:::tip You can change the values above to suit your needs. The commands can be run one at a time or in a group as show above. :::

• reboot/reset the device (press the button or unplug/plug in the device)
• when the device boots it should say "Environment" and it may show the sensor data
• if still "no data", run:

meshtastic --info

and verify the the telemetry_module_sensor_type

Known Problems

• No default configuration values are currently set, so this must be done when enabling the module.