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Add battery level to the BLE advertisement packet

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This commit is contained in:
rbaron 2021-02-14 13:15:41 +01:00
parent 9c2d95569d
commit 321e70a188
3 changed files with 39 additions and 15 deletions
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20
code/parasite/lib/parasite/parasite/ble_advertisement_data.cpp
View file

@ -1,11 +1,27 @@
#include "ble_advertisement_data.h"
#include <algorithm>
namespace parasite {
void BLEAdvertisementData::SetRawSoilMoisture(int raw_soil_moisture) {
uint16_t packed_value = raw_soil_moisture;
void BLEAdvertisementData::SetSoilMoistureRaw(int soil_moisture_raw) {
uint16_t packed_value = soil_moisture_raw;
data_[kRawSoilMoistureOffset] = packed_value >> 8;
data_[kRawSoilMoistureOffset + 1] = packed_value & 0xff;
}
void BLEAdvertisementData::SetSoilMoisturePercent(
double soil_moisture_percent) {
// TODO: 1.0 * MAX is too close to overflow for comfort?
uint16_t packed_value = ((1 << 16) - 1) * soil_moisture_percent;
data_[kPercentSoilMoistureOffset] = packed_value >> 8;
data_[kPercentSoilMoistureOffset + 1] = packed_value & 0xff;
}
void BLEAdvertisementData::SetBatteryVoltage(double battery_voltage) {
uint16_t packed_value = 1000 * battery_voltage;
data_[kBatteryVoltageOffset] = packed_value >> 8;
data_[kBatteryVoltageOffset + 1] = packed_value & 0xff;
}
} // namespace parasite

21
code/parasite/lib/parasite/parasite/ble_advertisement_data.h
View file

@ -8,20 +8,22 @@
namespace parasite {
constexpr size_t kAdvertisementDataLen = 18;
constexpr size_t kAdvertisementDataLen = 21;
constexpr size_t kRawSoilMoistureOffset = 14;
constexpr size_t kPercentSoilMoistureOffset = kRawSoilMoistureOffset + 2;
constexpr size_t kTemperatureOfsset = kRawSoilMoistureOffset + 4;
constexpr size_t kBatteryVoltageOffset = kRawSoilMoistureOffset + 4;
class BLEAdvertisementData {
public:
void SetRawSoilMoisture(int raw_soil_moisture);
void SetSoilMoistureRaw(int soil_moisture_raw);
void SetSoilMoisturePercent(double soil_moisture_percent);
void SetBatteryVoltage(double battery_voltage);
const uint8_t* GetRawData() const { return data_; }
size_t GetDataLen() const { return kAdvertisementDataLen; }
private:
uint8_t data_[kAdvertisementDataLen] = {
9, // Length of name.
9, // Length of name + data type.
BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME,
'P',
'a',
@ -31,14 +33,17 @@ class BLEAdvertisementData {
'i',
't',
'e',
7, // Length of the service data.
10, // Length of the service data + data type.
BLE_GAP_AD_TYPE_SERVICE_DATA,
0x1a,
0x18, // Environment sensor service UUID.
0x18, // Environment sensor service UUID (0x181a).
0x00,
0x00, // Raw soil humidity.
0x00, // Raw soil humidity (2 bytes).
0x00,
0x00, // Percentage soil humidity (2 bytes).
0x00,
0x00, // Battery voltage (2 bytes representing millivolts).
0x00,
0x00, // Percentage soil humidity.
};
};

13
code/parasite/src/main.cpp
View file

@ -25,10 +25,13 @@ parasite::SoilMonitor soil_monitor(kSoilMonitorAirVal, kSoilMonitorWaterVal,
kSoilAnalogPin);
void updateAdvertisingData(parasite::BLEAdvertiser* advertiser,
const parasite::soil_reading_t& soil_reading) {
const parasite::soil_reading_t& soil_reading,
double battery_voltage) {
parasite::BLEAdvertisementData data;
data.SetRawSoilMoisture(soil_reading.raw);
data.SetSoilMoistureRaw(soil_reading.raw);
data.SetSoilMoisturePercent(soil_reading.parcent);
data.SetBatteryVoltage(battery_voltage);
advertiser->SetData(data);
@ -51,8 +54,8 @@ void setup() {
}
void loop() {
double batt_voltage = batt_monitor.Read();
Serial.printf("Batt voltage: %f\n", batt_voltage);
double battery_voltage = batt_monitor.Read();
Serial.printf("Batt voltage: %f\n", battery_voltage);
parasite::soil_reading_t soil_reading = soil_monitor.Read();
Serial.printf("Moisture val: %d, %f%%\n", soil_reading.raw,
@ -60,7 +63,7 @@ void loop() {
digitalToggle(kLED1Pin);
updateAdvertisingData(&advertiser, soil_reading);
updateAdvertisingData(&advertiser, soil_reading, battery_voltage);
delay(500);
}