Skip to content

Fixed T1000-E temperature, lux and BME280 sensor reading accuracies #1247

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
entr0p1 wants to merge 2 commits into
base: dev
Choose a base branch
from
+23 −7
Open

Fixed T1000-E temperature, lux and BME280 sensor reading accuracies #1247

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
6c99382
Fixed T1000-E temperature and lux sensors
entr0p1 Dec 19, 2025
cc28b1a
EnvironmentSensorManager.cpp: Mitigate BME280 self-heating causing in…
entr0p1 Dec 20, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 13 additions & 4 deletions src/helpers/sensors/EnvironmentSensorManager.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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

Expand Down
10 changes: 7 additions & 3 deletions variants/t1000-e/t1000e_sensors.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
#define HEATER_NTC_BX 4250 // thermistor coefficient B
#define HEATER_NTC_RP 8250 // ohm, series resistance to thermistor
#define HEATER_NTC_KA 273.15 // 25 Celsius at Kelvin
#define NTC_REF_VCC 3000 // mV, output voltage of LDO
#define NTC_REF_VCC 3300 // mV, max voltage of 3V3 sensor rail
#define LIGHT_REF_VCC 2400 //

static unsigned int ntc_res2[136] = {
Expand Down Expand Up @@ -54,6 +54,7 @@ static int get_light_lv(unsigned int light_volt) {
float Vout = 0, Vin = 0, Rt = 0, temp = 0;
unsigned int light_level = 0;

// Seeed's firmware maps the photocell reading to a 0-100 % range rather than lux.
if (light_volt <= 80) {
light_level = 0;
return light_level;
Expand All @@ -75,7 +76,8 @@ float t1000e_get_temperature(void) {
analogReference(AR_INTERNAL_3_0);
analogReadResolution(12);
delay(10);
vcc_v = (1000.0 * (analogRead(BATTERY_PIN) * ADC_MULTIPLIER * AREF_VOLTAGE)) / 4096;
unsigned int rail_v = (1000.0 * (analogRead(BATTERY_PIN) * ADC_MULTIPLIER * AREF_VOLTAGE)) / 4096;
vcc_v = (rail_v > NTC_REF_VCC) ? NTC_REF_VCC : rail_v;
ntc_v = (1000.0 * AREF_VOLTAGE * analogRead(TEMP_SENSOR)) / 4096;
digitalWrite(PIN_3V3_EN, LOW);
digitalWrite(SENSOR_EN, LOW);
Expand All @@ -87,13 +89,15 @@ uint32_t t1000e_get_light(void) {
int lux = 0;
unsigned int lux_v = 0;

digitalWrite(PIN_3V3_EN, HIGH);
digitalWrite(SENSOR_EN, HIGH);
analogReference(AR_INTERNAL_3_0);
analogReadResolution(12);
delay(10);
lux_v = 1000 * analogRead(LUX_SENSOR) * AREF_VOLTAGE / 4096;
lux = get_light_lv(lux_v);
digitalWrite(SENSOR_EN, LOW);
digitalWrite(PIN_3V3_EN, LOW);

return lux;
}
}
1 change: 1 addition & 0 deletions variants/t1000-e/target.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,7 @@ bool T1000SensorManager::querySensors(uint8_t requester_permissions, CayenneLPP&
telemetry.addGPS(TELEM_CHANNEL_SELF, node_lat, node_lon, node_altitude);
}
if (requester_permissions & TELEM_PERM_ENVIRONMENT) {
// Firmware reports light as a 0-100 % scale, but expose it via Luminosity so app labels it "Luminosity".
telemetry.addLuminosity(TELEM_CHANNEL_SELF, t1000e_get_light());
telemetry.addTemperature(TELEM_CHANNEL_SELF, t1000e_get_temperature());
}
Expand Down
2 changes: 2 additions & 0 deletions variants/t1000-e/variant.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,8 @@ void initVariant()
// https://github.com/Seeed-Studio/Adafruit_nRF52_Arduino/blob/fab7d30a997a1dfeef9d1d59bfb549adda73815a/cores/nRF5/wiring.c#L65-L69

pinMode(BATTERY_PIN, INPUT);
pinMode(TEMP_SENSOR, INPUT);
pinMode(LUX_SENSOR, INPUT);
pinMode(EXT_CHRG_DETECT, INPUT);
pinMode(EXT_PWR_DETECT, INPUT);
pinMode(GPS_RESETB, INPUT);
Expand Down