BME680 support (experimental)
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README.md
13
README.md
@ -47,6 +47,7 @@ Depending on board hardware following features are supported:
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- Silicon unique ID
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- Battery voltage monitoring
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- GPS (Generic serial NMEA, or Quectel L76 I2C)
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- MEMS sensor (Bosch BME680)
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Target platform must be selected in [platformio.ini](https://github.com/cyberman54/ESP32-Paxcounter/blob/master/platformio.ini).<br>
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Hardware dependent settings (pinout etc.) are stored in board files in /hal directory. If you want to use a ESP32 board which is not yet supported, use hal file generic.h and tailor pin mappings to your needs. Pull requests for new boards welcome.<br>
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@ -198,6 +199,14 @@ Hereafter described is the default *plain* format, which uses MSB bit numbering.
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byte 1: Beacon RSSI reception level
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byte 2: Beacon identifier (0..255)
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**Port #7:** BME680 query result
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bytes 1-2: Temperature [°C]
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bytes 3-4: Pressure [hPa]
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byte 5: Humidity [%]
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bytes 6-7: Gas resistance [MOhm]
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bytes 8-9: Altitude [meter]
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# Remote control
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The device listenes for remote control commands on LoRaWAN Port 2. Multiple commands per downlink are possible by concatenating them.
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@ -310,6 +319,10 @@ Note: all settings are stored in NVRAM and will be reloaded when device starts.
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Device answers with it's current status on Port 4.
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0x85 get BME680 sensor data
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Device answers with BME680 sensor data set on Port 7.
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# License
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@ -2,17 +2,15 @@
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#define _HAS_BME
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#include "globals.h"
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#include <Wire.h>
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#include <SPI.h>
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#include <Adafruit_Sensor.h>
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#include "Adafruit_BME680.h"
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extern Adafruit_BME680 bme; // Make TinyGPS++ instance globally availabe
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extern Adafruit_BME680 bme; // Make bme instance globally availabe
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extern bmeStatus_t
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bme_status; // Make struct for storing gps data globally available
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extern TaskHandle_t BmeTask;
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void bme_loop(void *pvParameters);
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void bme_init();
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bool bme_read();
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#endif
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@ -47,11 +47,11 @@ typedef struct {
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} gpsStatus_t;
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typedef struct {
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float_t temperature;
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float_t pressure;
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float_t humidity;
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float_t gas_resistance;
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float_t altitude;
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uint16_t temperature; // Temperature * 100 in degrees Centigrade
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uint16_t pressure; // Barometic pressure in hecto pascals
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uint8_t humidity; // Relative humidity in percent
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uint32_t gas_resistance; // Resistance in Ohms
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uint16_t altitude; // Altitude in meters
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} bmeStatus_t;
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// global variables
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@ -1,64 +1,46 @@
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#ifdef HAS_BME
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#include "globals.h"
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#include "bme680read.h"
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// Local logging tag
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static const char TAG[] = "main";
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#include <Wire.h>
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#include <SPI.h>
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#include <Adafruit_Sensor.h>
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#include "Adafruit_BME680.h"
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#define SEALEVELPRESSURE_HPA (1013.25)
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// I2C Bus interface
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Adafruit_BME680 bme;
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bmeStatus_t bme_status;
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TaskHandle_t BmeTask;
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// BME680 read loop Task
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void bme_loop(void *pvParameters) {
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configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
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// initialize BME680 sensor
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if (!bme.begin()) {
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ESP_LOGE(TAG, "BME680 chip not found on i2c bus, bus error %d. "
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"Stopping BME task.");
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vTaskDelete(BmeTask);
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} else {
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ESP_LOGI(TAG, "BME680 chip found.");
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}
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void bme_init(void) {
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// initialize BME680 sensor using default i2c address 0x77
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if (bme.begin()) {
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// Set up oversampling and filter initialization
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bme.setTemperatureOversampling(BME680_OS_8X);
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bme.setHumidityOversampling(BME680_OS_2X);
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bme.setPressureOversampling(BME680_OS_4X);
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bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
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bme.setGasHeater(320, 150); // 320*C for 150 ms
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ESP_LOGI(TAG, "BME680 chip found and initialized");
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} else
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ESP_LOGE(TAG, "BME680 chip not found on i2c bus");
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}
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// read loop
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while (1) {
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vTaskDelay(10000 / portTICK_PERIOD_MS);
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if (!bme.performReading()) {
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ESP_LOGE(TAG, "BME680 read error");
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continue;
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} else {
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bool bme_read(void) {
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bool ret = bme.performReading();
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if (ret) {
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// read current BME data and buffer in global struct
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bme_status.temperature = bme.temperature;
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bme_status.pressure = bme.pressure / 100.0;
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bme_status.humidity = bme.humidity;
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bme_status.gas_resistance = bme.gas_resistance / 1000.0;
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bme_status.altitude = bme.readAltitude(SEALEVELPRESSURE_HPA);
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bme_status.temperature = (uint16_t)(bme.temperature * 100.0);
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bme_status.pressure = (uint16_t)(bme.pressure / 100.0);
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bme_status.humidity = (uint8_t)bme.humidity;
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bme_status.gas_resistance = (uint16_t)(bme.gas_resistance / 1000.0);
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bme_status.altitude =
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(uint16_t)(bme.readAltitude(SEALEVELPRESSURE_HPA / 1000.0));
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ESP_LOGI(TAG, "BME680 sensor data read success");
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} else {
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ESP_LOGI(TAG, "BME680 sensor read error");
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}
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} // end of infinite loop
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vTaskDelete(NULL); // shoud never be reached
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} // bme_loop()
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return ret;
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}
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#endif // HAS_BME
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@ -32,6 +32,11 @@ void doHousekeeping() {
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}
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#endif
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#ifdef HAS_BME
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// read BME280 sensor if present
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bme_read();
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#endif
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// task storage debugging //
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ESP_LOGD(TAG, "Wifiloop %d bytes left",
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uxTaskGetStackHighWaterMark(wifiSwitchTask));
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@ -3,6 +3,8 @@
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#include <stdint.h>
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//#define HAS_BME 1 // BME680 sensor on I2C bus (SDI=21/SCL=22); comment out if not present
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// Hardware related definitions for Heltec LoRa-32 Board
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#define HAS_LORA 1 // comment out if device shall not send data via LoRa
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#define CFG_sx1276_radio 1
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@ -8,6 +8,8 @@
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// This settings are for boards labeled v1.6 on pcb, NOT for v1.5 or older
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*/
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//#define HAS_BME 1 // BME680 sensor on I2C bus (SDI=21/SCL=22); comment out if not present
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#define HAS_LORA 1 // comment out if device shall not send data via LoRa
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#define CFG_sx1276_radio 1 // HPD13A LoRa SoC
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@ -422,14 +422,14 @@ void user_request_network_time_callback(void *pVoidUserUTCTime,
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lmic_time_reference_t lmicTimeReference;
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if (flagSuccess != 1) {
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ESP_LOGW(TAG, "Network time request callback error");
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ESP_LOGW(TAG, "LoRaWAN network did not answer time request");
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return;
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}
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// Populate lmic_time_reference
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flagSuccess = LMIC_getNetworkTimeReference(&lmicTimeReference);
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if (flagSuccess != 1) {
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ESP_LOGW(TAG, "Network time request failed");
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ESP_LOGW(TAG, "LoRaWAN time request failed");
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return;
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}
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16
src/main.cpp
16
src/main.cpp
@ -35,7 +35,6 @@ IDLE 0 0 ESP32 arduino scheduler -> runs wifi sniffer
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looptask 1 1 arduino core -> runs the LMIC LoRa stack
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irqhandler 1 1 executes tasks triggered by irq
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gpsloop 1 2 reads data from GPS over serial or i2c
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bmeloop 1 2 reads data from BME680 over i2c
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IDLE 1 0 ESP32 arduino scheduler
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ESP32 hardware timers
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@ -56,7 +55,8 @@ uint8_t volatile channel = 0; // channel rotation counter
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uint16_t volatile macs_total = 0, macs_wifi = 0, macs_ble = 0,
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batt_voltage = 0; // globals for display
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hw_timer_t *channelSwitch = NULL, *sendCycle = NULL, *homeCycle = NULL, *displaytimer = NULL; // irq tasks
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hw_timer_t *channelSwitch = NULL, *sendCycle = NULL, *homeCycle = NULL,
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*displaytimer = NULL; // irq tasks
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TaskHandle_t irqHandlerTask, wifiSwitchTask;
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std::set<uint16_t> macs; // container holding unique MAC adress hashes
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@ -161,6 +161,7 @@ void setup() {
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// initialize gps
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#ifdef HAS_BME
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strcat_P(features, " BME");
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bme_init();
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#endif
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// initialize LoRa
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@ -281,17 +282,6 @@ void setup() {
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1); // CPU core
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#endif
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#ifdef HAS_BME
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ESP_LOGI(TAG, "Starting BMEloop...");
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xTaskCreatePinnedToCore(bme_loop, // task function
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"bmeloop", // name of task
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2048, // stack size of task
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(void *)1, // parameter of the task
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2, // priority of the task
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&BmeTask, // task handle
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1); // CPU core
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#endif
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// start state machine
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ESP_LOGI(TAG, "Starting IRQ Handler...");
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xTaskCreatePinnedToCore(irqHandler, // task function
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@ -59,6 +59,7 @@
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#define LPP1PORT 1 // Port for Cayenne LPP 1.0 dynamic sensor encoding
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#define LPP2PORT 2 // Port for Cayenne LPP 2.0 packed sensor encoding
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#define BEACONPORT 6 // Port on which device sends beacon alarms
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#define BMEPORT 7 // Port on which device sends BME680 sensor data
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// Some hardware settings
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#define RGBLUMINOSITY 30 // RGB LED luminosity [default = 30%]
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@ -95,11 +95,15 @@ void PayloadConvert::addGPS(gpsStatus_t value) {
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void PayloadConvert::addBME(bmeStatus_t value) {
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#ifdef HAS_BME
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buffer[cursor++] = (byte)(value.temperature);
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buffer[cursor++] = (byte)(value.pressure);
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buffer[cursor++] = highByte(value.temperature);
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buffer[cursor++] = lowByte(value.temperature);
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buffer[cursor++] = highByte(value.pressure);
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buffer[cursor++] = lowByte(value.pressure);
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buffer[cursor++] = (byte)(value.humidity);
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buffer[cursor++] = (byte)(value.gas_resistance);
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buffer[cursor++] = (byte)(value.altitude);
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buffer[cursor++] = highByte(value.gas_resistance);
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buffer[cursor++] = lowByte(value.gas_resistance);
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buffer[cursor++] = highByte(value.altitude);
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buffer[cursor++] = lowByte(value.altitude);
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#endif
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}
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@ -162,11 +166,11 @@ void PayloadConvert::addGPS(gpsStatus_t value) {
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void PayloadConvert::addBME(bmeStatus_t value) {
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#ifdef HAS_BME
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writeUint8((byte)value.temperature);
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writeUint8((byte)value.pressure);
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writeUint8((byte)value.humidity);
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writeUint8((byte)value.gas_resistance);
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writeUint8((byte)value.altitude);
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writeUint16(value.temperature);
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writeUint16(value.pressure);
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writeUint8(value.humidity);
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writeUint16(value.gas_resistance);
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writeUint16(value.altitude);
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#endif
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}
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@ -240,6 +240,17 @@ void get_gps(uint8_t val[]) {
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#endif
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};
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void get_bme(uint8_t val[]) {
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ESP_LOGI(TAG, "Remote command: get bme680 sensor data");
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#ifdef HAS_BME
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payload.reset();
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payload.addBME(bme_status);
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SendData(BMEPORT);
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#else
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ESP_LOGW(TAG, "BME680 sensor not supported");
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#endif
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};
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// assign previously defined functions to set of numeric remote commands
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// format: opcode, function, #bytes params,
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// flag (true = do make settings persistent / false = don't)
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@ -255,7 +266,8 @@ cmd_t table[] = {
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{0x0f, set_wifiant, 1, true}, {0x10, set_rgblum, 1, true},
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{0x11, set_monitor, 1, true}, {0x12, set_beacon, 7, false},
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{0x80, get_config, 0, false}, {0x81, get_status, 0, false},
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{0x84, get_gps, 0, false}};
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{0x84, get_gps, 0, false}, {0x85, get_bme, 0, false},
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};
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const uint8_t cmdtablesize =
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sizeof(table) / sizeof(table[0]); // number of commands in command table
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