From cc28b1a34d19d5f9254b7e443ca7ba5baa239b9b Mon Sep 17 00:00:00 2001 From: entr0p1 <1475255+entr0p1@users.noreply.github.com> Date: Sat, 20 Dec 2025 21:51:51 +1100 Subject: [PATCH] EnvironmentSensorManager.cpp: Mitigate BME280 self-heating causing inaccurate readings. --- .../sensors/EnvironmentSensorManager.cpp | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/src/helpers/sensors/EnvironmentSensorManager.cpp b/src/helpers/sensors/EnvironmentSensorManager.cpp index 2692ec9c..77a791bd 100644 --- a/src/helpers/sensors/EnvironmentSensorManager.cpp +++ b/src/helpers/sensors/EnvironmentSensorManager.cpp @@ -192,6 +192,13 @@ bool EnvironmentSensorManager::begin() { if (BME280.begin(TELEM_BME280_ADDRESS, TELEM_WIRE)) { MESH_DEBUG_PRINTLN("Found BME280 at address: %02X", TELEM_BME280_ADDRESS); MESH_DEBUG_PRINTLN("BME sensor ID: %02X", BME280.sensorID()); + // Reduce self-heating: single-shot conversions, light oversampling, long standby. + BME280.setSampling(Adafruit_BME280::MODE_FORCED, + Adafruit_BME280::SAMPLING_X1, // temperature + Adafruit_BME280::SAMPLING_X1, // pressure + Adafruit_BME280::SAMPLING_X1, // humidity + Adafruit_BME280::FILTER_OFF, + Adafruit_BME280::STANDBY_MS_1000); BME280_initialized = true; } else { BME280_initialized = false; @@ -359,10 +366,12 @@ bool EnvironmentSensorManager::querySensors(uint8_t requester_permissions, Cayen #if ENV_INCLUDE_BME280 if (BME280_initialized) { - telemetry.addTemperature(TELEM_CHANNEL_SELF, BME280.readTemperature()); - telemetry.addRelativeHumidity(TELEM_CHANNEL_SELF, BME280.readHumidity()); - telemetry.addBarometricPressure(TELEM_CHANNEL_SELF, BME280.readPressure()/100); - telemetry.addAltitude(TELEM_CHANNEL_SELF, BME280.readAltitude(TELEM_BME280_SEALEVELPRESSURE_HPA)); + if (BME280.takeForcedMeasurement()) { // trigger a fresh reading in forced mode + telemetry.addTemperature(TELEM_CHANNEL_SELF, BME280.readTemperature()); + telemetry.addRelativeHumidity(TELEM_CHANNEL_SELF, BME280.readHumidity()); + telemetry.addBarometricPressure(TELEM_CHANNEL_SELF, BME280.readPressure()/100); + telemetry.addAltitude(TELEM_CHANNEL_SELF, BME280.readAltitude(TELEM_BME280_SEALEVELPRESSURE_HPA)); + } } #endif